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<h3>
Sebastian Graf pushed to branch wip/T18249
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88b71323c0fc30e5882512932c2849fcdafa125f">88b71323</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-09-16T18:30:00+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reorder stuff and get documentation in order
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<h4>1 changed file:</h4>
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<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<h4>Changes:</h4>
<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88b71323c0fc30e5882512932c2849fcdafa125f#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -13,7 +13,7 @@ Authors: George Karachalias <george.karachalias@cs.kuleuven.be></td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In terms of the [Lower Your Guards paper](https://dl.acm.org/doi/abs/10.1145/3408989)</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- describing the implementation, this module is concerned with Sections 3.4, 3.6 and 3.7.</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g., it represents refinement types diretly as a normalised refinement type 'Nabla'.</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g., it represents refinement types dire<span class="idiff left right">c</span>tly as a normalised refinement type 'Nabla'.</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.HsToCore.PmCheck.Oracle</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tracePm</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPmId</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -115,7 +115,7 @@ mkPmId ty = getUniqueM >>= \unique -></td>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkLocalIdOrCoVar</span> <span class="n" style="color: #333;">name</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Caching <span class="idiff left right">possible matches of a</span> COMPLETE set</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Caching <span class="idiff left right">residual</span> COMPLETE set</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Implementation of COMPLETE pragmas]</span></span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -222,116 +222,6 @@ that the match in the guards of @f@ is exhaustive, where the COMPLETE set</td>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applies due to refined type information.</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Instantiating constructors, types and evidence</span></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"></span>
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228
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="cd">-- | Instantiate a 'ConLike' given its universal type arguments. Instantiates</span></span>
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229
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- existential and term binders with fresh variables of appropriate type.</span></span>
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230
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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns instantiated type and term variables from the match, type evidence</span></span>
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231
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and the types of strict constructor fields.</span></span>
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232
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="n" style="color: #333;">instCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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233
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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * 'con' K is a ConLike</span></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the case of DataCons and most PatSynCons, these</span></span>
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235
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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are associated with a particular TyCon T</span></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - But there are PatSynCons for this is not the case! See #11336, #17112</span></span>
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237
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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * 'arg_tys' tys are the types K's universally quantified type</span></span>
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239
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables should be instantiated to.</span></span>
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240
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - For DataCons and most PatSyns these are the arguments of their TyCon</span></span>
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241
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - For cases like the PatSyns in #11336, #17112, we can't easily guess</span></span>
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242
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these, so don't call this function.</span></span>
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243
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After instantiating the universal tyvars of K to tys we get</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- K @tys :: forall bs. Q => s1 .. sn -> T tys</span></span>
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246
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that if K is a PatSynCon, depending on arg_tys, T might not necessarily</span></span>
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247
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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be a concrete TyCon.</span></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Suppose y1 is a strict field. Then we get</span></span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Results: bs</span></span>
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251
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [y1,..,yn]</span></span>
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252
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Q</span></span>
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253
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [s1]</span></span>
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254
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="n" style="color: #333;">instCon</span> <span class="n" style="color: #333;">fuel</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span><span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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256
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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"> <span class="n" style="color: #333;">src_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">normalisedSourceType</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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257
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mb_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">src_ty</span> <span class="n" style="color: #333;">con</span></span>
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258
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_arg_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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259
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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260
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">eq_spec</span><span class="p">,</span> <span class="n" style="color: #333;">thetas</span><span class="p">,</span> <span class="n" style="color: #333;">_req_theta</span><span class="p">,</span> <span class="n" style="color: #333;">field_tys</span><span class="p">,</span> <span class="n" style="color: #333;">_con_res_ty</span><span class="p">)</span></span>
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261
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFullSig</span> <span class="n" style="color: #333;">con</span></span>
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262
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Substitute universals for type arguments</span></span>
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263
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst_univ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">arg_tys</span></span>
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264
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate fresh existentials as arguments to the constructor. This is</span></span>
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265
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- important for instantiating the Thetas and field types.</span></span>
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266
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneTyVarBndrs</span> <span class="n" style="color: #333;">subst_univ</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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267
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">field_tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">field_tys</span></span>
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268
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate fresh term variables as arguments to the constructor</span></span>
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269
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">mkPmId</span> <span class="n" style="color: #333;">field_tys'</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All constraints bound by the constructor (alpha-renamed), these are added</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to the type oracle</span></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">gammas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">eqSpecPreds</span> <span class="n" style="color: #333;">eq_spec</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">thetas</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finally add everything to nabla</span></span>
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"instCon"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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276
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<pre style="margin: 0;">-<span id="LC276" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"... ->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">_con_res_ty</span></span>
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277
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">zipWith</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'↦'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span></span>
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278
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">gammas</span></span>
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279
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="n" style="color: #333;">arg_ids</span><span class="p">)</span></span>
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280
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<pre style="margin: 0;">-<span id="LC280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fuel</span></span>
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"> <span class="p">]</span></span>
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282
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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283
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<pre style="margin: 0;">-<span id="LC283" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiConCt</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">gammas</span> <span class="n" style="color: #333;">arg_ids</span><span class="p">)</span></span>
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284
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"> <span class="n" style="color: #333;">inhabitationTest</span> <span class="n" style="color: #333;">fuel</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">nabla'</span></span>
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285
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<pre style="margin: 0;">-<span id="LC285" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Could not guess arg_tys. Just assume inhabited</span></span>
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286
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"></span>
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287
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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Strict fields and variables of unlifted type]</span></span>
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288
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Binders of unlifted type (and strict fields) are unlifted by construction;</span></span>
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<pre style="margin: 0;">-<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they are conceived with an implicit @≁⊥@ constraint to begin with. Hence,</span></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugaring in "GHC.HsToCore.PmCheck" is entirely unconcerned by strict fields,</span></span>
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<pre style="margin: 0;">-<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since the forcing happens *before* pattern matching.</span></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. But for each strict (or more generally, unlifted) field @s@ we have to add</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @s ≁ ⊥@ constraints when we check the PmCon guard in</span></span>
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'GHC.HsToCore.PmCheck.checkGrd'. Strict fields are devoid of ⊥ by</span></span>
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297
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<pre style="margin: 0;">-<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> construction, there's nothing that a bang pattern would act on. Example</span></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from #18341:</span></span>
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<pre style="margin: 0;">-<span id="LC299" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _) | False = () -- inaccessible</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT !_) | False = () -- redundant, not only inaccessible!</span></span>
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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<pre style="margin: 0;">-<span id="LC305" class="line" lang="haskell"></span>
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306
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The second clause desugars to @MkT n <- x, !n@. When coverage checked,</span></span>
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307
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<pre style="margin: 0;">-<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the 'PmCon' @MkT n <- x@ refines the set of values that reach the bang</span></span>
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308
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern with the constraints @x ~ MkT n, n ≁ ⊥@ (this list is computed by</span></span>
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309
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<pre style="margin: 0;">-<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'phiConCts'). Checking the 'PmBang' @!n@ will then try to add the</span></span>
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310
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraint @n ~ ⊥@ to this set to get the diverging set, which is found</span></span>
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311
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<pre style="margin: 0;">-<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be empty. Hence the whole clause is detected as redundant, as</span></span>
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312
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> expected.</span></span>
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<pre style="margin: 0;">-<span id="LC313" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. Similarly, when performing the inhabitation test ('ensureInhabited'),</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when instantiating a constructor in 'instCon', we have to generate</span></span>
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the appropriate unliftedness constraints and hence call 'phiConCts'.</span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. TODO</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">While the calls to 'phiConCts' in 1. and 2. seem disconnected at first, it</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">makes sense when drawing the connection to the paper: Figure 7 desugars</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">higher-level φ constraints to lower-level δ constraints and 'phiConCts' is</span></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exactly the desugaring of a φ constructor constraint, which are generated by</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the coverage checking functions A and U ('checkGrd') as well as the</span></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inhabitation test \(∇ ⊢ x inh\) in Figure 7 ('ensureInhabited').</span></span>
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<pre style="margin: 0;">-<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently, this implementation just lacks a separate type for φ constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC330" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Pattern match oracle</span></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Oracle transition function</span></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Type normalisation</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -568,140 +458,6 @@ pmTopNormaliseType, using the constraint solver to solve for any local</td>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities (such as i ~ Int) that may be in scope.</span></span>
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Type oracle</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"><span class="cd">-- | Allocates a fresh 'EvVar' name for 'PredTy's.</span></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"><span class="n" style="color: #333;">nameTyCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">nameTyCt</span> <span class="n" style="color: #333;">pred_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="n" style="color: #333;">unique</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUniqueM</span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">occname</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="p">(</span><span class="s" style="color: #d14;">"pm_"</span><span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">unique</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">idname</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="n" style="color: #333;">unique</span> <span class="n" style="color: #333;">occname</span> <span class="n" style="color: #333;">noSrcSpan</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkLocalIdOrCoVar</span> <span class="n" style="color: #333;">idname</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pred_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"><span class="cd">-- | Add some extra type constraints to the 'TyState'; return 'Nothing' if we</span></span>
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- find a contradiction (e.g. @Int ~ Bool@).</span></span>
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">tyOracle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"><span class="n" style="color: #333;">tyOracle</span> <span class="n" style="color: #333;">ty_st</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_st</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">nameTyCt</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"tyOracle"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">_warns</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">),</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initTcDsForSolver</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcCheckSatisfiability</span> <span class="n" style="color: #333;">inert</span> <span class="n" style="color: #333;">evs</span></span>
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<pre style="margin: 0;">-<span id="LC592" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- return the new inert set and increment the sequence number n</span></span>
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<td class="diff-line-num old old_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">mb_new_inert</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mb_new_inert</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC595" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tyOracle"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprErrMsgBagWithLoc</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> DIdEnv with sharing</span></span>
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<pre style="margin: 0;">-<span id="LC600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TmState</span></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> What we know about terms</span></span>
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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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609
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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The Pos/Neg invariant]</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Invariant applying to each VarInfo: Whenever we have @(C, [y,z])@ in 'vi_pos',</span></span>
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<pre style="margin: 0;">-<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any entry in 'vi_neg' must be incomparable to C (return Nothing) according to</span></span>
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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'eqPmAltCons'. Those entries that are comparable either lead to a refutation</span></span>
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<pre style="margin: 0;">-<span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or are redundant. Examples:</span></span>
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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ Just y@, @x ≁ [Just]@. 'eqPmAltCon' returns @Equal@, so refute.</span></span>
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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ Nothing@, @x ≁ [Just]@. 'eqPmAltCon' returns @Disjoint@, so negative</span></span>
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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info is redundant and should be discarded.</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ I# y@, @x ≁ [4,2]@. 'eqPmAltCon' returns @PossiblyOverlap@, so orthogal.</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We keep this info in order to be able to refute a redundant match on i.e. 4</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later on.</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This carries over to pattern synonyms and overloaded literals. Say, we have</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just42 = Just 42</span></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case Just42 of x</span></span>
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just _ -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though we had a solution for the value abstraction called x here in form</span></span>
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<pre style="margin: 0;">-<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of a PatSynCon (Just42,[]), this solution is incomparable to both Nothing and</span></span>
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Just. Hence we retain the info in vi_neg, which eventually allows us to detect</span></span>
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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the complete pattern match.</span></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The Pos/Neg invariant extends to vi_rcm, which stores essentially positive</span></span>
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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information. We make sure that vi_neg and vi_rcm never overlap. This isn't</span></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictly necessary since vi_rcm is just a cache, so doesn't need to be</span></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">accurate: Every suggestion of a possible ConLike from vi_rcm might be</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">refutable by the type oracle anyway. But it helps to maintain sanity while</span></span>
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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">debugging traces.</span></span>
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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Why record both positive and negative info?]</span></span>
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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might think that knowing positive info (like x ~ Just y) would render</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">negative info irrelevant, but not so because of pattern synonyms. E.g we might</span></span>
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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">know that x cannot match (Foo 4), where pattern Foo p = Just p</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also overloaded literals themselves behave like pattern synonyms. E.g if</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">postively we know that (x ~ I# y), we might also negatively want to record that</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">x does not match 45 f 45 = e2 f (I# 22#) = e3 f 45 = e4 --</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Overlapped</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TmState invariants]</span></span>
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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The term oracle state is never obviously (i.e., without consulting the type</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">oracle) contradictory. This implies a few invariants:</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whenever vi_pos overlaps with vi_neg according to 'eqPmAltCon', we refute.</span></span>
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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is implied by the Note [Pos/Neg invariant].</span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whenever vi_neg subsumes a COMPLETE set, we refute. We consult vi_rcm to</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> detect this, but we could just compare whole COMPLETE sets to vi_neg every</span></span>
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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> time, if it weren't for performance.</span></span>
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<pre style="margin: 0;">-<span id="LC661" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Maintaining these invariants in 'addVarCt' (the core of the term oracle) and</span></span>
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<pre style="margin: 0;">-<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'addNotConCt' is subtle.</span></span>
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<pre style="margin: 0;">-<span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Merging VarInfos. Example: Add the fact @x ~ y@ (see 'equate').</span></span>
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<pre style="margin: 0;">-<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (COMPLETE) If we had @x ≁ True@ and @y ≁ False@, then we get</span></span>
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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ≁ [True,False]@. This is vacuous by matter of comparing to the built-in</span></span>
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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> COMPLETE set, so should refute.</span></span>
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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Pos/Neg) If we had @x ≁ True@ and @y ~ True@, we have to refute.</span></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Adding positive information. Example: Add the fact @x ~ K ys@ (see 'addConCt')</span></span>
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<pre style="margin: 0;">-<span id="LC670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Neg) If we had @x ≁ K@, refute.</span></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Pos) If we had @x ~ K2@, and that contradicts the new solution according to</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'eqPmAltCon' (ex. K2 is [] and K is (:)), then refute.</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Refine) If we had @x ≁ K zs@, unify each y with each z in turn.</span></span>
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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Adding negative information. Example: Add the fact @x ≁ Nothing@ (see 'addNotConCt')</span></span>
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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Refut) If we have @x ~ K ys@, refute.</span></span>
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (COMPLETE) If K=Nothing and we had @x ≁ Just@, then we get</span></span>
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ≁ [Just,Nothing]@. This is vacuous by matter of comparing to the built-in</span></span>
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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> COMPLETE set, so should refute.</span></span>
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<pre style="margin: 0;">-<span id="LC679" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that merging VarInfo in equate can be done by calling out to 'addConCt' and</span></span>
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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'addNotConCt' for each of the facts individually.</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Representation of Strings in TmState]</span></span>
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead of treating regular String literals as a PmLits, we treat it as a list</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of characters in the oracle for better overlap reasoning. The following example</span></span>
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shows why:</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: String -> ()</span></span>
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f ('f':_) = ()</span></span>
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f "foo" = ()</span></span>
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second case is redundant, and we like to warn about it. Therefore either</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the oracle will have to do some smart conversion between the list and literal</span></span>
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">representation or treat is as the list it really is at runtime.</span></span>
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "smart conversion" has the advantage of leveraging the more compact literal</span></span>
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">representation wherever possible, but is really nasty to get right with negative</span></span>
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities: Just think of how to encode @x /= "foo"@.</span></span>
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "list" option is far simpler, but incurs some overhead in representation and</span></span>
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">warning messages (which can be alleviated by someone with enough dedication).</span></span>
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Looking up VarInfo</span></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -709,17 +465,13 @@ emptyRCM :: ResidualCompleteMatches</td>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRCM</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RCM</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"><span class="n" style="color: #333;">emptyVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We could initialise @bot@ to @Just False@ in case of an unlifted type here,</span></span>
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<pre style="margin: 0;">-<span id="LC713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but it's cleaner to let the user of the constraint solver take care of this.</span></span>
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<pre style="margin: 0;">-<span id="LC714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After all, there are also strict fields, the unliftedness of which isn't</span></span>
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<pre style="margin: 0;">-<span id="LC715" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- evident in the type. So treating unlifted types here would never be</span></span>
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<pre style="margin: 0;">-<span id="LC716" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- sufficient anyway.</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"><span class="n" style="color: #333;">emptyVarInfo</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">VI</span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">vi_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_neg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyPmAltConSet</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Case (3) in Note [Strict fields and fields of unlifted type]</span></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">vi_rcm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRCM</span></span>
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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -747,6 +499,13 @@ lookupVarInfoNT ts x = case lookupVarInfo ts x of</td>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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501
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"><span class="n" style="color: #333;">trvVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="n" style="color: #333;">trvVarInfo</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set_vi</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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505
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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506
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="n" style="color: #333;">set_vi</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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507
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="n" style="color: #333;">vi'</span> <span class="p">}</span> <span class="p">})</span></span>
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508
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"></span>
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509
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------------------------------</span></span>
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Exported utility functions querying 'Nabla'</span></span>
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511
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -802,6 +561,8 @@ lookupSolution nabla x = case vi_pos (lookupVarInfo (nabla_tm_st nabla) x) of</td>
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561
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>
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562
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------</span></span>
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804
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Adding φ constraints</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Figure 7 in the LYG paper.</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"><span class="cd">-- | A high-level pattern-match constraint. Corresponds to φ from Figure 3 of</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the LYG paper.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -853,24 +614,9 @@ addPhiCts :: Nabla -> PhiCts -> DsM (Maybe Nabla)</td>
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853
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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854
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615
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCts</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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616
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Delaying the inhabitation test]</span></span>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">inhabitationTest</span> <span class="n" style="color: #333;">initFuel</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">nabla'</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why not always perform the inhabitation test immediately after adding type</span></span>
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- info? Because of infinite loops. Consider</span></span>
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f :: a :~: Int -> b :~: Bool -> a -> b -> ()</span></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- f !x !y !_ !_ | False = ()</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The ≁⊥ constraint on the x will need an inhabitation test,</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which instantiates to the GADT constructor Refl. We add its Theta to the</span></span>
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type state and perform an inhabitation test on *all* other variables.</span></span>
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When testing y, we similarly instantiate the GADT constructor Refl.</span></span>
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- That will add *its* Theta to the type state and perform an inhabtiation test</span></span>
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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for all other variables, including x. And so on, and infinite loop.</span></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So we perform the inhabitation test once after having added all constraints</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that we wanted to add.</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="cd">-- | Add 'PmCts' ('addPhiCts') without performing an inhabitation test by</span></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instantiation afterwards. Very much for internal use only!</span></span>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PhiCts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -878,7 +624,7 @@ addPhiCtsNoTest :: Nabla -> PhiCts -> MaybeT DsM Nabla</td>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ty_cts</span><span class="p">,</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionPhiCts</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCts</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla'</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">addPhi<span class="idiff left right">Tm</span>Ct</span> <span class="n" style="color: #333;">nabla'</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">tm_cts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="n" style="color: #333;">partitionPhiCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PhiCts</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PhiCt</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">partitionPhiCts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionEithers</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">to_either</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">toList</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="886" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -886,6 +632,9 @@ partitionPhiCts = partitionEithers . map to_either . toList</td>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"> <span class="n" style="color: #333;">to_either</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="n" style="color: #333;">pred_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">pred_ty</span></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"> <span class="n" style="color: #333;">to_either</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Adding type constraints</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="cd">-- | Adds new type-level constraints by calling out to the type-checker via</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'tyOracle'.</span></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell"><span class="n" style="color: #333;">addTyCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -893,6 +642,32 @@ addTyCts nabla@MkNabla{ nabla_ty_st = ty_st } new_ty_cs = do</td>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_st'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="p">(</span><span class="n" style="color: #333;">tyOracle</span> <span class="n" style="color: #333;">ty_st</span> <span class="n" style="color: #333;">new_ty_cs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="cd">-- | Add some extra type constraints to the 'TyState'; return 'Nothing' if we</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- find a contradiction (e.g. @Int ~ Bool@).</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="n" style="color: #333;">tyOracle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="n" style="color: #333;">tyOracle</span> <span class="n" style="color: #333;">ty_st</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_st</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">nameTyCt</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"tyOracle"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">_warns</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">),</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initTcDsForSolver</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcCheckSatisfiability</span> <span class="n" style="color: #333;">inert</span> <span class="n" style="color: #333;">evs</span></span>
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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- return the new inert set and increment the sequence number n</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">mb_new_inert</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySt</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mb_new_inert</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tyOracle"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprErrMsgBagWithLoc</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cd">-- | Allocates a fresh 'EvVar' name for 'PredTy's.</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="n" style="color: #333;">nameTyCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="n" style="color: #333;">nameTyCt</span> <span class="n" style="color: #333;">pred_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"> <span class="n" style="color: #333;">unique</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getUniqueM</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">occname</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="p">(</span><span class="s" style="color: #d14;">"pm_"</span><span class="o" style="font-weight: 600;">++</span><span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">unique</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"> <span class="n" style="color: #333;">idname</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="n" style="color: #333;">unique</span> <span class="n" style="color: #333;">occname</span> <span class="n" style="color: #333;">noSrcSpan</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkLocalIdOrCoVar</span> <span class="n" style="color: #333;">idname</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">pred_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ** Adding term constraints</span></span>
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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell"><span class="cd">-- | Adds a single higher-level φ constraint by dispatching to the various</span></span>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- oracle functions.</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -901,24 +676,27 @@ addTyCts nabla@MkNabla{ nabla_ty_st = ty_st } new_ty_cs = do</td>
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<pre style="margin: 0;"> <span id="LC676" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- into lower-level δ constraints. We don't have a data type for δ constraints</span></span>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and call the corresponding oracle function directly instead.</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: The φ is <span class="idiff left right">not</span> a type constraint! These should be handled by</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: The φ is <span class="idiff left right">/not/</span> a type constraint! These should be handled by</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'addTyCts' before, through 'addPhiCts'.</span></span>
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<pre style="margin: 0;">-<span id="LC906" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PhiCt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">-<span id="LC907" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"addPhiCt:TyCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See the precondition</span></span>
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<pre style="margin: 0;">-<span id="LC908" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PhiCt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"addPhiCt:TyCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See the precondition</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiCoreCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Case (1) of Note [Strict fields and variables of unlifted type]</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- PhiConCt correspond to the higher-level φ constraints from the paper with</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bindings semantics. It disperses into lower-level δ constraints that the</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 'add*Ct' functions correspond to.</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addTyCts</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">dicts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla''</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla'</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unlifted_fields</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"addPhiCt"</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isBanged</span> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla''</span> <span class="n" style="color: #333;">unlifted_fields</span></span>
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla''</span> <span class="p">(</span><span class="n" style="color: #333;">filterUnliftedFields</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiNotConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiNotBotCt</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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695
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"><span class="n" style="color: #333;">filterUnliftedFields</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span></span>
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697
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="n" style="color: #333;">filterUnliftedFields</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"addPhiCt"</span> <span class="n" style="color: #333;">args</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span></span>
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699
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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isBanged</span> <span class="n" style="color: #333;">bang</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="p">]</span></span>
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"></span>
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701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~ ⊥@, e.g. that evaluation of a particular 'Id' @x@</span></span>
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- surely diverges. Quite similar to 'addConCt', only that it only cares about</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -926,6 +704,7 @@ addPhiCt nabla (PhiNotBotCt x) = addNotBotCt nabla x</td>
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926
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704
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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705
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">env</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addBotCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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708
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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709
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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x ≁ ⊥. Contradiction!</span></span>
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710
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x ~ ⊥. Nothing left to do</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="712" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -933,6 +712,20 @@ addBotCt nabla@MkNabla{ nabla_tm_st = ts@TmSt{ ts_facts=env } } x = do</td>
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933
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712
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~/ ⊥@ to 'Nabla'. Quite similar to 'addNotConCt',</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but only cares for the ⊥ "constructor".</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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719
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x ~ ⊥. Contradiction!</span></span>
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722
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x ≁ ⊥. Nothing left to do</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- We add x ≁ ⊥ and test if x is still inhabited</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mark dirty for a delayed inhabitation test</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">markDirty</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"><span class="cd">-- | Record a @x ~/ K@ constraint, e.g. that a particular 'Id' @x@ can't</span></span>
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<pre style="margin: 0;"> <span id="LC730" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- take the shape of a 'PmAltCon' @K@ in the 'Nabla' and return @Nothing@ if</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that leads to a contradiction.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -975,12 +768,359 @@ hasRequiredTheta (PmAltConLike cl) = notNull req_theta</td>
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975
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768
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">req_theta</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFullSig</span> <span class="n" style="color: #333;">cl</span></span>
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976
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"><span class="n" style="color: #333;">hasRequiredTheta</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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977
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770
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Completeness checking with required Thetas]</span></span>
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979
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<pre style="margin: 0;">-<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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980
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the situation in #11224</span></span>
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981
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"></span>
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982
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> import Text.Read (readMaybe)</span></span>
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983
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<pre style="margin: 0;">-<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern PRead :: Read a => () => a -> String</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cd">-- | Add a @x ~ K tvs args ts@ constraint.</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @addConCt x K tvs args ts@ extends the substitution with a solution</span></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @x :-> (K, tvs, args)@ if compatible with the negative and positive info we</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have on @x@, reject (@Nothing@) otherwise.</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">env</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First try to refute with a negative fact</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">elemPmAltConSet</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">neg</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then see if any of the other solutions (remember: each of them is an</span></span>
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- additional refinement of the possible values x could take) indicate a</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- contradiction</span></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="p">((</span><span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">Disjoint</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">paca_con</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span><span class="p">)</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now we should be good! Add (alt, tvs, args) as a possible solution, or</span></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- refine an existing one</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">find</span> <span class="p">((</span><span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Equal</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">paca_con</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span> <span class="kr" style="font-weight: 600;">of</span></span>
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789
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">_con</span> <span class="n" style="color: #333;">other_tvs</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must unify existentially bound ty vars and arguments!</span></span>
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791
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equateTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">other_tvs</span><span class="p">)</span></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">/=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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793
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"error"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_var_ct</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_var_ct</span> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"addConCt"</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">other_args</span></span>
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797
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pos'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">pos</span></span>
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799
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla_with</span> <span class="n" style="color: #333;">bot'</span> <span class="o" style="font-weight: 600;">=</span></span>
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800
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">vi</span><span class="p">{</span><span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos'</span><span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot'</span><span class="p">})}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do (2) in Note [Coverage checking Newtype matches]</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">),</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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805
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span></span>
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806
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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807
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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808
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">alt</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- strict match ==> not ⊥</span></span>
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PhiCt</span><span class="p">]</span></span>
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812
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">=</span></span>
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813
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="p">(</span><span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"equateTys"</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">us</span></span>
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The following line filters out trivial Refl constraints, so that we don't</span></span>
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need to initialise the type oracle that often</span></span>
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817
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">eqType</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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818
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"><span class="cd">-- | Adds a @x ~ y@ constraint by trying to unify two 'Id's and record the</span></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- gained knowledge in 'Nabla'.</span></span>
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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ when there's a contradiction. Returns @Just nabla@</span></span>
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824
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when the constraint was compatible with prior facts, in which case @nabla@</span></span>
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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has integrated the knowledge from the equality constraint.</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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828
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we never @equate@ two variables of the same equivalence</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class, otherwise we might get cyclic substitutions.</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Cf. 'extendSubstAndSolve' and</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @testsuite/tests/pmcheck/should_compile/CyclicSubst.hs@.</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="cd">-- | @equate ts@(TmSt env) x y@ merges the equivalence classes of @x@ and @y@ by</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- adding an indirection to the environment.</span></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Makes sure that the positive and negative facts of @x@ and @y@ are</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- compatible.</span></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Preconditions: @not (sameRepresentativeSDIE env x y)@</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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844
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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845
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="p">)</span></span>
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847
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span> <span class="p">})</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span> <span class="p">}</span> <span class="p">})</span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Merge the info we have for x into the info for y</span></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This assert will probably trigger at some point...</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We should decide how to break the tie</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">idType</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">idType</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi_y</span><span class="p">),</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Not same type"</span> <span class="p">)</span></span>
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855
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First assume that x and y are in the same equivalence class</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_ind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then sum up the refinement counters</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_refs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env_ind</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi_y</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla_refs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env_refs</span><span class="p">}</span> <span class="p">}</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and then gradually merge every positive fact we have on x into y</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla_pos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;">nabla_refs</span> <span class="p">(</span><span class="n" style="color: #333;">vi_pos</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do the same for negative info</span></span>
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864
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">nalt</span></span>
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865
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla_neg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;">nabla_pos</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">vi_neg</span> <span class="n" style="color: #333;">vi_x</span><span class="p">))</span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- vi_rcm will be updated in addNotConCt, so we are good to</span></span>
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867
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- go!</span></span>
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868
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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla_neg</span></span>
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869
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"></span>
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870
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="cd">-- | Inspects a 'PmCoreCt' @let x = e@ by recording constraints for @x@ based</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- on the shape of the 'CoreExpr' @e@. Examples:</span></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = Just (42, 'z')@ we want to record the</span></span>
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874
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints @x ~ Just a, a ~ (b, c), b ~ 42, c ~ 'z'@.</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'data_con_app'.</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = unpackCString# "tmp"@ we want to record the literal</span></span>
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877
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraint @x ~ "tmp"@.</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = I# 42@ we want the literal constraint @x ~ 42@. Similar</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for other literals. See 'coreExprAsPmLit'.</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Finally, if we have @let x = e@ and we already have seen @let y = e@, we</span></span>
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881
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- want to record @x ~ y@.</span></span>
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882
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_opts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initSimpleOpts</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">simpl_opts</span> <span class="n" style="color: #333;">e</span></span>
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886
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addCoreCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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887
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="n" style="color: #333;">execStateT</span> <span class="p">(</span><span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="n" style="color: #333;">nabla</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Takes apart a 'CoreExpr' and tries to extract as much information about</span></span>
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890
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- literals and constructor applications as possible.</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Handle newtypes properly, by wrapping the expression in a DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is the right thing for casts involving data family instances and</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- their representation TyCon, though (which are not visible in source</span></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- syntax). See Note [COMPLETE sets on data families]</span></span>
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- core_expr x e | pprTrace "core_expr" (ppr x $$ ppr e) False = undefined</span></span>
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897
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">_t</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pmLitAsStringLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreExprAsPmLit</span> <span class="n" style="color: #333;">e</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">expr_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">stringTy</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Representation of Strings in TmState]</span></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unpackFS</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need this special case to break a loop with coreExprAsPmLit</span></span>
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905
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise we alternate endlessly between [] and ""</span></span>
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906
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">emptyInScopeSet</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">mkListExpr</span> <span class="n" style="color: #333;">charTy</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkCharExpr</span> <span class="n" style="color: #333;">s'</span><span class="p">))</span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreExprAsPmLit</span> <span class="n" style="color: #333;">e</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span></span>
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910
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">_empty_floats</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">_arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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911
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsConApp_maybe</span> <span class="n" style="color: #333;">in_scope_env</span> <span class="n" style="color: #333;">e</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num new new_line" data-linenumber="913" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Detecting pattern synonym applications in expressions]</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataConId_maybe</span> <span class="n" style="color: #333;">x</span></span>
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<td class="diff-line-num new new_line" data-linenumber="915" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't consider DataCons flexible variables</span></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="918" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any other expression. Try to find other uses of a semantically</span></span>
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<td class="diff-line-num new new_line" data-linenumber="919" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
919
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent expression and represent them by the same variable!</span></span>
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920
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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921
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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922
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span></span>
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923
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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924
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">expr_in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnfolding</span><span class="p">)</span></span>
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925
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's inconvenient to get hold of a global in-scope set</span></span>
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926
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here, but it'll only be needed if exprIsConApp_maybe ends</span></span>
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927
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- up substituting inside a forall or lambda (i.e. seldom)</span></span>
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928
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so using exprFreeVars seems fine. See MR !1647.</span></span>
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929
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | The @e@ in @let x = e@ had no familiar form. But we can still see if</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see if we already encountered a constraint @let y = e'@ with @e'@</span></span>
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932
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<pre style="margin: 0;">+<span id="LC932" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- semantically equivalent to @e@, in which case we may add the constraint</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @x ~ y@.</span></span>
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934
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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935
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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936
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<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">swap</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="937" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
937
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that @rep == x@ if we encountered @e@ for the first time.</span></span>
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938
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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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939
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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell"></span>
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940
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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<td class="diff-line-num new new_line" data-linenumber="941" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
941
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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942
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)))</span></span>
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943
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Look at @let x = K taus theta es@ and generate the following</span></span>
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<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraints (assuming universals were dropped from @taus@ before):</span></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x ≁ ⊥@ if 'K' is not a Newtype constructor.</span></span>
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@</span></span>
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. @x ~ K as ys@</span></span>
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is quite similar to PmCheck.pmConCts.</span></span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConExTyCoVars</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"> <span class="n" style="color: #333;">arty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConSourceArity</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ex_ty_args</span><span class="p">,</span> <span class="n" style="color: #333;">val_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAtList</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="n" style="color: #333;">args</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="n" style="color: #333;">ex_ty_args</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"> <span class="n" style="color: #333;">vis_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">arty</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">val_args</span></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq_supply</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cloneTyVarBndrs</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="n" style="color: #333;">uniq_supply</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equateTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">ex_tys</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x ≁ ⊥@ if 'K' is not a Newtype constructor (#18341)</span></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@. See also #17703</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">vis_args</span></span>
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970
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. @x ~ K as ys@</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">arg_ids</span></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds a literal constraint, i.e. @x ~ 42@.</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Also we assume that literal expressions won't diverge, so this</span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will add a @x ~/ ⊥@ constraint.</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds the given constructor application as a solution for @x@.</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cd">-- | Finds a representant of the semantic equality class of the given @e@.</span></span>
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Which is the @x@ of a @let x = e'@ constraint (with @e@ semantically</span></span>
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equivalent to @e'@) we encountered earlier, or a fresh identifier if</span></span>
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there weren't any such constraints.</span></span>
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">reps'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">rep</span></span>
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps'</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla'</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="cd">-- | Like 'modify', but with an effectful modifier action</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"><span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">m</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="n" style="color: #333;">modifyT</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fmap</span> <span class="p">((,)</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">f</span></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The Pos/Neg invariant]</span></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Invariant applying to each VarInfo: Whenever we have @C @tvs args@ in 'vi_pos',</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any entry in 'vi_neg' must be incomparable to C (return Nothing) according to</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'eqPmAltCons'. Those entries that are comparable either lead to a refutation</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or are redundant. Examples:</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ Just y@, @x ≁ [Just]@. 'eqPmAltCon' returns @Equal@, so refute.</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ Nothing@, @x ≁ [Just]@. 'eqPmAltCon' returns @Disjoint@, so negative</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> info is redundant and should be discarded.</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* @x ~ I# y@, @x ≁ [4,2]@. 'eqPmAltCon' returns @PossiblyOverlap@, so orthogal.</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We keep this info in order to be able to refute a redundant match on i.e. 4</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later on.</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This carries over to pattern synonyms and overloaded literals. Say, we have</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Just42 = Just 42</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case Just42 of x</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nothing -> ()</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just _ -> ()</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though we had a solution for the value abstraction called x here in form</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of a PatSynCon Just42, this solution is incomparable to both Nothing and</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Just. Hence we retain the info in vi_neg, which eventually allows us to detect</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the complete pattern match.</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The Pos/Neg invariant extends to vi_rcm, which essentially stores positive</span></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information. We make sure that vi_neg and vi_rcm never overlap. This isn't</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictly necessary since vi_rcm is just a cache, so doesn't need to be</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">accurate: Every suggestion of a possible ConLike from vi_rcm might be</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">refutable by the type oracle anyway. But it helps to maintain sanity while</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">debugging traces.</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Why record both positive and negative info?]</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might think that knowing positive info (like x ~ Just y) would render</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">negative info irrelevant, but not so because of pattern synonyms. E.g we might</span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">know that x cannot match (Foo 4), where pattern Foo p = Just p</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Also overloaded literals themselves behave like pattern synonyms. E.g if</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">postively we know that (x ~ I# y), we might also negatively want to record that</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">x does not match 45 f 45 = e2 f (I# 22#) = e3 f 45 = e4 --</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Overlapped</span></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TmState invariants]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1044" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The term oracle state is never obviously (i.e., without consulting the type</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">oracle or doing inhabitation testing) contradictory. This implies a few</span></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">invariants:</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whenever vi_pos overlaps with vi_neg according to 'eqPmAltCon', we refute.</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is implied by the Note [Pos/Neg invariant].</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whenever vi_neg subsumes a COMPLETE set, we refute. We consult vi_rcm to</span></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> detect this, but we could just compare whole COMPLETE sets to vi_neg every</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> time, if it weren't for performance.</span></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Maintaining these invariants in 'addVarCt' (the core of the term oracle) and</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'addNotConCt' is subtle.</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Merging VarInfos. Example: Add the fact @x ~ y@ (see 'equate').</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (COMPLETE) If we had @x ≁ True@ and @y ≁ False@, then we get</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ≁ [True,False]@. This is vacuous by matter of comparing to the built-in</span></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> COMPLETE set, so should refute.</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Pos/Neg) If we had @x ≁ True@ and @y ~ True@, we have to refute.</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Adding positive information. Example: Add the fact @x ~ K ys@ (see 'addConCt')</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Neg) If we had @x ≁ K@, refute.</span></span>
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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Pos) If we had @x ~ K2@, and that contradicts the new solution according to</span></span>
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1064
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<pre style="margin: 0;">+<span id="LC1064" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'eqPmAltCon' (ex. K2 is [] and K is (:)), then refute.</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Refine) If we had @x ≁ K zs@, unify each y with each z in turn.</span></span>
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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Adding negative information. Example: Add the fact @x ≁ Nothing@ (see 'addNotConCt')</span></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (Refut) If we have @x ~ K ys@, refute.</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - (COMPLETE) If K=Nothing and we had @x ≁ Just@, then we get</span></span>
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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ≁ [Just,Nothing]@. This is vacuous by matter of comparing to the built-in</span></span>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> COMPLETE set, so should refute.</span></span>
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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that merging VarInfo in equate can be done by calling out to 'addConCt' and</span></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'addNotConCt' for each of the facts individually.</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Representation of Strings in TmState]</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead of treating regular String literals as a PmLits, we treat it as a list</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of characters in the oracle for better overlap reasoning. The following example</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shows why:</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"></span>
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1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: String -> ()</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f ('f':_) = ()</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f "foo" = ()</span></span>
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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second case is redundant, and we like to warn about it. Therefore either</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the oracle will have to do some smart conversion between the list and literal</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">representation or treat is as the list it really is at runtime.</span></span>
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1089
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"></span>
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1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "smart conversion" has the advantage of leveraging the more compact literal</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">representation wherever possible, but is really nasty to get right with negative</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1092" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities: Just think of how to encode @x /= "foo"@.</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "list" option is far simpler, but incurs some overhead in representation and</span></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">warning messages (which can be alleviated by someone with enough dedication).</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Detecting pattern synonym applications in expressions]</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At the moment we fail to detect pattern synonyms in scrutinees and RHS of</span></span>
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1099
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guards. This could be alleviated with considerable effort and complexity, but</span></span>
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1100
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<pre style="margin: 0;">+<span id="LC1100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the returns are meager. Consider:</span></span>
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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern P</span></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Q</span></span>
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1104
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case P 15 of</span></span>
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1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Q _ -> ...</span></span>
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1106
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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> P 15 -></span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Compared to the situation where P and Q are DataCons, the lack of generativity</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means we could never flag Q as redundant. (also see Note [Undecidable Equality</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for PmAltCons] in PmTypes.) On the other hand, if we fail to recognise the</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pattern synonym, we flag the pattern match as inexhaustive. That wouldn't happen</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if we had knowledge about the scrutinee, in which case the oracle basically</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">knows "If it's a P, then its field is 15".</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a pretty narrow use case and I don't think we should to try to fix it</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until a user complains energetically.</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"></span>
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1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Completeness checking with required Thetas]</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the situation in #11224</span></span>
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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> import Text.Read (readMaybe)</span></span>
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern PRead :: Read a => () => a -> String</span></span>
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<pre style="margin: 0;"> <span id="LC1124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern PRead x <- (readMaybe -> Just x)</span></span>
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1125
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<pre style="margin: 0;"> <span id="LC1125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: String -> Int</span></span>
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (PRead x) = x</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1004,46 +1144,57 @@ we no longer detect the actually redundant match in</td>
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1144
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"></span>
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But that's a small price to pay, compared to the proper solution here involving</span></span>
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1006
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">storing required arguments along with the PmAltConLike in 'vi_neg'.</span></span>
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1147
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1009" class="line" lang="haskell"><span class="cd">-- | Guess the universal argument types of a ConLike from an instantiation of</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- its result type. Rather easy for DataCons, but not so much for PatSynCons.</span></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Pattern synonym result type] in "GHC.Core.PatSyn".</span></span>
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1012
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">res_ty</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Consider data families: In case of a DataCon, we need to translate to</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the representation TyCon.</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">rep_tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcLookupDataFamInst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">rep_tc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tc_args'</span></span>
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1020
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">ps</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1022
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We are successful if we managed to instantiate *every* univ_tv of con.</span></span>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is difficult and bound to fail in some cases, see</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Pattern synonym result type] in GHC.Core.PatSyn. So we just try our best</span></span>
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1025
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<pre style="margin: 0;">-<span id="LC1025" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here and be sure to return an instantiation when we can substitute every</span></span>
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1026
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<pre style="margin: 0;">-<span id="LC1026" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- universally quantified type variable.</span></span>
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1027
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We *could* instantiate all the other univ_tvs just to fresh variables, I</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suppose, but that means we get weird field types for which we don't know</span></span>
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1029
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<pre style="margin: 0;">-<span id="LC1029" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- anything. So we prefer to keep it simple here.</span></span>
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1030
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<pre style="margin: 0;">-<span id="LC1030" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">con_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">patSynSig</span> <span class="n" style="color: #333;">ps</span></span>
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1031
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<pre style="margin: 0;">-<span id="LC1031" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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1032
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<pre style="margin: 0;">-<span id="LC1032" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">lookupTyVar</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">univ_tvs</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Strict fields and variables of unlifted type]</span></span>
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1149
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1150
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Binders of unlifted type (and strict fields) are unlifted by construction;</span></span>
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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they are conceived with an implicit @≁⊥@ constraint to begin with. Hence,</span></span>
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1152
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<pre style="margin: 0;">+<span id="LC1152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">desugaring in "GHC.HsToCore.PmCheck" is entirely unconcerned by strict fields,</span></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">since the forcing happens *before* pattern matching.</span></span>
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1154
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<pre style="margin: 0;">+<span id="LC1154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And the φ constructor constraints emitted by 'GHC.HsToCore.PmCheck.checkGrd'</span></span>
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1155
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<pre style="margin: 0;">+<span id="LC1155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have complex binding semantics (binding type constraints and unlifted fields),</span></span>
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1156
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<pre style="margin: 0;">+<span id="LC1156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so unliftedness semantics are entirely confined to the oracle.</span></span>
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1033
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1157
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<pre style="margin: 0;"> <span id="LC1157" class="line" lang="haskell"></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"><span class="cd">-- | Adds the constraint @x ~/ ⊥@ to 'Nabla'. Quite similar to 'addNotConCt',</span></span>
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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but only cares for the ⊥ "constructor".</span></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"><span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfoNT</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_tm_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mzero</span> <span class="c1" style="color: #998; font-style: italic;">-- There was x ~ ⊥. Contradiction!</span></span>
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1041
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<td class="diff-line-num new_line old" data-linenumber="1158" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span> <span class="c1" style="color: #998; font-style: italic;">-- There already is x ≁ ⊥. Nothing left to do</span></span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="c1" style="color: #998; font-style: italic;">-- We add x ≁ ⊥ and test if x is still inhabited</span></span>
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1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mark dirty for a delayed inhabitation test</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vi</span><span class="p">{</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span><span class="p">}</span></span>
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1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">markDirty</span> <span class="n" style="color: #333;">y</span></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi'</span> <span class="p">}</span> <span class="p">}</span></span>
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1158
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<pre style="margin: 0;">+<span id="LC1158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These are the moving parts:</span></span>
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1159
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<pre style="margin: 0;">+<span id="LC1159" class="line" lang="haskell"></span>
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1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. For each strict (or more generally, unlifted) field @s@ of a 'PhiConCt'</span></span>
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1161
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<pre style="margin: 0;">+<span id="LC1161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we have to add a @s ≁ ⊥@ constraint in the corresponding case of</span></span>
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1162
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<pre style="margin: 0;">+<span id="LC1162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'addPhiTmCt'. Strict fields are devoid of ⊥ by construction, there's</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1163" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1163
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<pre style="margin: 0;">+<span id="LC1163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> nothing that a bang pattern would act on. Example from #18341:</span></span>
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1164
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<pre style="margin: 0;">+<span id="LC1164" class="line" lang="haskell"></span>
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1165
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<pre style="margin: 0;">+<span id="LC1165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !Int</span></span>
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1166
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<pre style="margin: 0;">+<span id="LC1166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> ()</span></span>
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1167
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<pre style="margin: 0;">+<span id="LC1167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _) | False = () -- inaccessible</span></span>
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1168
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT !_) | False = () -- redundant, not only inaccessible!</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f _ = ()</span></span>
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1170
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<pre style="margin: 0;">+<span id="LC1170" class="line" lang="haskell"></span>
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1171
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<pre style="margin: 0;">+<span id="LC1171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The second clause desugars to @MkT n <- x, !n@. When coverage checked,</span></span>
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1172
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<pre style="margin: 0;">+<span id="LC1172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the 'PmCon' @MkT n <- x@ refines the set of values that reach the bang</span></span>
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1173
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<pre style="margin: 0;">+<span id="LC1173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern with the φ constraints @MkT n <- x@ (Nothing surprising so far).</span></span>
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1174
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<pre style="margin: 0;">+<span id="LC1174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Upon that constraint, it disperses into two lower-level δ constraints</span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @x ~ MkT n, n ≁ ⊥@ per Equation (3) in Figure 7 of the paper.</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Checking the 'PmBang' @!n@ will then try to add the</span></span>
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1178
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraint @n ~ ⊥@ to this set to get the diverging set, which is found</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be empty. Hence the whole clause is detected as redundant, as</span></span>
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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> expected.</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. Similarly, when performing the 'inhabitationTest', when instantiating a</span></span>
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1183
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor we call 'instCon', which generates a higher-level φ</span></span>
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1184
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor constraint.</span></span>
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1185
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"></span>
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1186
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. The preceding points handle unlifted constructor fields, but there also</span></span>
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1187
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are regular binders of unlifted type.</span></span>
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1188
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Since the oracle as implemented has no notion of scoping and bindings,</span></span>
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1189
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we can't know *when* an unlifted variable comes into scope. But that's</span></span>
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1190
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not actually a problem, because we can just add the @x ≁ ⊥@ to the</span></span>
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1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'emptyVarInfo' when we first encounter it.</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Inhabitation testing</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Figure 8 in the LYG paper.</span></span>
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1047
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"></span>
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1048
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1199
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"><span class="n" style="color: #333;">tyStateChanged</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyState</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1049
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Makes use of the fact that the two TyStates we compare</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1134,16 +1285,6 @@ instBot _fuel nabla vi = do</td>
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1134
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1285
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<pre style="margin: 0;"> <span id="LC1285" class="line" lang="haskell"> <span class="n" style="color: #333;">_nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi</span><span class="p">)</span></span>
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1135
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1286
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<pre style="margin: 0;"> <span id="LC1286" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">vi</span></span>
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1136
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"></span>
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1137
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<pre style="margin: 0;">-<span id="LC1137" class="line" lang="haskell"><span class="n" style="color: #333;">trvVarInfo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarInfo</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">)</span></span>
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1138
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<pre style="margin: 0;">-<span id="LC1138" class="line" lang="haskell"><span class="n" style="color: #333;">trvVarInfo</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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1139
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<pre style="margin: 0;">-<span id="LC1139" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">set_vi</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1140
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<pre style="margin: 0;">-<span id="LC1140" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1141
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<pre style="margin: 0;">-<span id="LC1141" class="line" lang="haskell"> <span class="n" style="color: #333;">set_vi</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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1142
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<pre style="margin: 0;">-<span id="LC1142" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi'</span><span class="p">)</span> <span class="n" style="color: #333;">vi'</span> <span class="p">}</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC1143" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--overVarInfo :: Functor f => (VarInfo -> f VarInfo) -> Nabla -> Id -> f Nabla</span></span>
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<pre style="margin: 0;">-<span id="LC1145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--overVarInfo f nabla x = snd <$> trvVarInfo (\vi -> ((),) <$> f vi) nabla x</span></span>
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1288" class="line" lang="haskell"><span class="n" style="color: #333;">addNormalisedTypeMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ResidualCompleteMatches</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"><span class="n" style="color: #333;">addNormalisedTypeMatches</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC1290" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trvVarInfo</span> <span class="n" style="color: #333;">add_matches</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1339" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1198,7 +1339,7 @@ instCompleteSet fuel nabla x cs</td>
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1198
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1339
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<pre style="margin: 0;"> <span id="LC1339" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ConLike</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1199
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1340
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<pre style="margin: 0;"> <span id="LC1340" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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<pre style="margin: 0;"> <span id="LC1341" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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1201
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">micro-optimisation, shaves down -7% allocations for PmSeriesG</span></span></span>
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<pre style="margin: 0;">+<span id="LC1342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">See Note [DataCons that are definitely inhabitable]</span></span></span>
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1202
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Recall that dc can't be in vi_neg, because then it would be</span></span>
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deleted from the residual COMPLETE set.</span></span>
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1213" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1354" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1213,114 +1354,18 @@ instCompleteSet fuel nabla x cs</td>
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1213
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<pre style="margin: 0;"> <span id="LC1354" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">recur_not_con</span> <span class="c1" style="color: #998; font-style: italic;">-- Assume that x can't be con. Encode that fact</span></span>
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<pre style="margin: 0;"> <span id="LC1355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with addNotConCt and recur.</span></span>
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1215
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1356
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"></span>
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1216
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<pre style="margin: 0;">-<span id="LC1216" class="line" lang="haskell"><span class="cd">-- | Is this 'DataCon' trivially inhabited, that is, without needing to perform</span></span>
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1217
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<pre style="margin: 0;">-<span id="LC1217" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- any inhabitation testing because of strict fields or type equalities?</span></span>
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<pre style="margin: 0;">-<span id="LC1218" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1219
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<pre style="margin: 0;">-<span id="LC1219" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span></span>
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1220
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<pre style="margin: 0;">-<span id="LC1220" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTheta</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">-- (1)</span></span>
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1221
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<pre style="margin: 0;">-<span id="LC1221" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConImplBangs</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (2)</span></span>
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1222
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<pre style="margin: 0;">-<span id="LC1222" class="line" lang="haskell"></span>
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1223
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<pre style="margin: 0;">-<span id="LC1223" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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1224
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<pre style="margin: 0;">-<span id="LC1224" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Term oracle unification procedure</span></span>
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1225
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<pre style="margin: 0;">-<span id="LC1225" class="line" lang="haskell"></span>
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1226
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<pre style="margin: 0;">-<span id="LC1226" class="line" lang="haskell"><span class="cd">-- | Adds a @x ~ y@ constraint by trying to unify two 'Id's and record the</span></span>
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1227
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<pre style="margin: 0;">-<span id="LC1227" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- gained knowledge in 'Nabla'.</span></span>
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1228
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<pre style="margin: 0;">-<span id="LC1228" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1229
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<pre style="margin: 0;">-<span id="LC1229" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @Nothing@ when there's a contradiction. Returns @Just nabla@</span></span>
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1230
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<pre style="margin: 0;">-<span id="LC1230" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- when the constraint was compatible with prior facts, in which case @nabla@</span></span>
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1231
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<pre style="margin: 0;">-<span id="LC1231" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- has integrated the knowledge from the equality constraint.</span></span>
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1232
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<pre style="margin: 0;">-<span id="LC1232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1233
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<pre style="margin: 0;">-<span id="LC1233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1234
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<pre style="margin: 0;">-<span id="LC1234" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1235
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<pre style="margin: 0;">-<span id="LC1235" class="line" lang="haskell"><span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1236
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<pre style="margin: 0;">-<span id="LC1236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's important that we never @equate@ two variables of the same equivalence</span></span>
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1237
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<pre style="margin: 0;">-<span id="LC1237" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class, otherwise we might get cyclic substitutions.</span></span>
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1238
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<pre style="margin: 0;">-<span id="LC1238" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Cf. 'extendSubstAndSolve' and</span></span>
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1239
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<pre style="margin: 0;">-<span id="LC1239" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @testsuite/tests/pmcheck/should_compile/CyclicSubst.hs@.</span></span>
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1240
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<pre style="margin: 0;">-<span id="LC1240" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla</span></span>
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1241
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<pre style="margin: 0;">-<span id="LC1241" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1242
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<pre style="margin: 0;">-<span id="LC1242" class="line" lang="haskell"></span>
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1243
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<pre style="margin: 0;">-<span id="LC1243" class="line" lang="haskell"><span class="cd">-- | @equate ts@(TmSt env) x y@ merges the equivalence classes of @x@ and @y@ by</span></span>
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1244
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<pre style="margin: 0;">-<span id="LC1244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- adding an indirection to the environment.</span></span>
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1245
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<pre style="margin: 0;">-<span id="LC1245" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Makes sure that the positive and negative facts of @x@ and @y@ are</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1246" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1246
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<pre style="margin: 0;">-<span id="LC1246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- compatible.</span></span>
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1247
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<pre style="margin: 0;">-<span id="LC1247" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Preconditions: @not (sameRepresentativeSDIE env x y)@</span></span>
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1248
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<pre style="margin: 0;">-<span id="LC1248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1249
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<pre style="margin: 0;">-<span id="LC1249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1250
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<pre style="margin: 0;">-<span id="LC1250" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1251
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<pre style="margin: 0;">-<span id="LC1251" class="line" lang="haskell"><span class="n" style="color: #333;">equate</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span><span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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1252
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<pre style="margin: 0;">-<span id="LC1252" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">sameRepresentativeSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="p">)</span></span>
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1253
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<pre style="margin: 0;">-<span id="LC1253" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">lookupSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1254
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<pre style="margin: 0;">-<span id="LC1254" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span> <span class="p">})</span></span>
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1255
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<pre style="margin: 0;">-<span id="LC1255" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">x</span> <span class="p">}</span> <span class="p">})</span></span>
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1256
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<pre style="margin: 0;">-<span id="LC1256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Merge the info we have for x into the info for y</span></span>
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1257
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<pre style="margin: 0;">-<span id="LC1257" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">vi_y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1258
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<pre style="margin: 0;">-<span id="LC1258" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This assert will probably trigger at some point...</span></span>
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1259
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<pre style="margin: 0;">-<span id="LC1259" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We should decide how to break the tie</span></span>
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1260
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<pre style="margin: 0;">-<span id="LC1260" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">idType</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">idType</span> <span class="p">(</span><span class="n" style="color: #333;">vi_id</span> <span class="n" style="color: #333;">vi_y</span><span class="p">),</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Not same type"</span> <span class="p">)</span></span>
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1261
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<pre style="margin: 0;">-<span id="LC1261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First assume that x and y are in the same equivalence class</span></span>
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1262
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_ind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setIndirectSDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1263" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1263
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<td class="diff-line-num new_line old" data-linenumber="1357" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then sum up the refinement counters</span></span>
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1264
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<pre style="margin: 0;">-<span id="LC1264" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env_refs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env_ind</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">vi_y</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1265" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1265
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<td class="diff-line-num new_line old" data-linenumber="1357" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1265" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla_refs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env_refs</span><span class="p">}</span> <span class="p">}</span></span>
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1266
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<td class="diff-line-num new_line old" data-linenumber="1357" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1266" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and then gradually merge every positive fact we have on x into y</span></span>
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1267
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<pre style="margin: 0;">-<span id="LC1267" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">cl</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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1268
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<pre style="margin: 0;">-<span id="LC1268" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla_pos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_fact</span> <span class="n" style="color: #333;">nabla_refs</span> <span class="p">(</span><span class="n" style="color: #333;">vi_pos</span> <span class="n" style="color: #333;">vi_x</span><span class="p">)</span></span>
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1269
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<pre style="margin: 0;">-<span id="LC1269" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do the same for negative info</span></span>
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1270
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<pre style="margin: 0;">-<span id="LC1270" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">nalt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addNotConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">nalt</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla_neg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_refut</span> <span class="n" style="color: #333;">nabla_pos</span> <span class="p">(</span><span class="n" style="color: #333;">pmAltConSetElems</span> <span class="p">(</span><span class="n" style="color: #333;">vi_neg</span> <span class="n" style="color: #333;">vi_x</span><span class="p">))</span></span>
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1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- vi_rcm will be updated in addNotConCt, so we are good to</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- go!</span></span>
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1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">nabla_neg</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1276
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<pre style="margin: 0;">-<span id="LC1276" class="line" lang="haskell"><span class="cd">-- | Add a @x ~ K tvs args ts@ constraint.</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @addConCt x K tvs args ts@ extends the substitution with a solution</span></span>
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1278
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<td class="diff-line-num new_line old" data-linenumber="1357" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @x :-> (K, tvs, args)@ if compatible with the negative and positive info we</span></span>
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1279
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<td class="diff-line-num new_line old" data-linenumber="1357" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have on @x@, reject (@Nothing@) otherwise.</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TmState invariants].</span></span>
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1282
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<pre style="margin: 0;">-<span id="LC1282" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1283
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"><span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_facts</span><span class="o" style="font-weight: 600;">=</span><span class="n" style="color: #333;">env</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1284" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">vi</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VI</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pos</span> <span class="n" style="color: #333;">neg</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupVarInfo</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">x</span></span>
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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First try to refute with a negative fact</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1286" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">elemPmAltConSet</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">neg</span><span class="p">))</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then see if any of the other solutions (remember: each of them is an</span></span>
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1288
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- additional refinement of the possible values x could take) indicate a</span></span>
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1289
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- contradiction</span></span>
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1290
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<pre style="margin: 0;">-<span id="LC1290" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="p">((</span><span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">Disjoint</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">paca_con</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span><span class="p">)</span></span>
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1291
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<pre style="margin: 0;">-<span id="LC1291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now we should be good! Add (alt, tvs, args) as a possible solution, or</span></span>
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1292
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<pre style="margin: 0;">-<span id="LC1292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- refine an existing one</span></span>
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1293
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<pre style="margin: 0;">-<span id="LC1293" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">find</span> <span class="p">((</span><span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Equal</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">eqPmAltCon</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">paca_con</span><span class="p">)</span> <span class="n" style="color: #333;">pos</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1294
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">_con</span> <span class="n" style="color: #333;">other_tvs</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1295
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<pre style="margin: 0;">-<span id="LC1295" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must unify existentially bound ty vars and arguments!</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1296" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1296
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<pre style="margin: 0;">-<span id="LC1296" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equateTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">other_tvs</span><span class="p">)</span></span>
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1297
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<pre style="margin: 0;">-<span id="LC1297" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">/=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1298
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<pre style="margin: 0;">-<span id="LC1298" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"error"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other_args</span><span class="p">)</span></span>
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1299
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<pre style="margin: 0;">-<span id="LC1299" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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1300
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<pre style="margin: 0;">-<span id="LC1300" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">add_var_ct</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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1301
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<pre style="margin: 0;">-<span id="LC1301" class="line" lang="haskell"> <span class="n" style="color: #333;">foldlM</span> <span class="n" style="color: #333;">add_var_ct</span> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"addConCt"</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">other_args</span></span>
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1302
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<pre style="margin: 0;">-<span id="LC1302" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1303
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<pre style="margin: 0;">-<span id="LC1303" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pos'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PACA</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">pos</span></span>
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1304
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<pre style="margin: 0;">-<span id="LC1304" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla_with</span> <span class="n" style="color: #333;">bot'</span> <span class="o" style="font-weight: 600;">=</span></span>
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1305
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<pre style="margin: 0;">-<span id="LC1305" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span><span class="n" style="color: #333;">ts_facts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setEntrySDIE</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">vi</span><span class="p">{</span><span class="n" style="color: #333;">vi_pos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pos'</span><span class="p">,</span> <span class="n" style="color: #333;">vi_bot</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bot'</span><span class="p">})}</span> <span class="p">}</span></span>
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1306
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<pre style="margin: 0;">-<span id="LC1306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do (2) in Note [Coverage checking Newtype matches]</span></span>
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1307
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<pre style="margin: 0;">-<span id="LC1307" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">alt</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1308
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<pre style="margin: 0;">-<span id="LC1308" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">),</span> <span class="p">[</span><span class="n" style="color: #333;">y</span><span class="p">])</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">-></span></span>
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1309
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<pre style="margin: 0;">-<span id="LC1309" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">bot</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1310
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<pre style="margin: 0;">-<span id="LC1310" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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1312
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeBot</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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1313
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<pre style="margin: 0;">-<span id="LC1313" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isPmAltConMatchStrict</span> <span class="n" style="color: #333;">alt</span> <span class="p">)</span></span>
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1314
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<pre style="margin: 0;">-<span id="LC1314" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_with</span> <span class="kt" style="color: #458; font-weight: 600;">IsNotBot</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- strict match ==> not ⊥</span></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"><span class="cd">-- | Is this 'DataCon' trivially inhabited, that is, without needing to perform</span></span>
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1358
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- any inhabitation testing because of strict/unlifted fields or type equalities?</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1362" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"><span class="n" style="color: #333;">isDataConTriviallyInhabited</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">=</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1363" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConTheta</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">-- (1)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1364" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConImplBangs</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="c1" style="color: #998; font-style: italic;">-- (2)</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">scaledThing</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dataConOrigArgTys</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (3)</span></span>
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1315
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1366
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"></span>
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1316
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<pre style="margin: 0;">-<span id="LC1316" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">PhiCt</span><span class="p">]</span></span>
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1317
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<pre style="margin: 0;">-<span id="LC1317" class="line" lang="haskell"><span class="n" style="color: #333;">equateTys</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">us</span> <span class="o" style="font-weight: 600;">=</span></span>
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1318
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<pre style="margin: 0;">-<span id="LC1318" class="line" lang="haskell"> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">PhiTyCt</span> <span class="p">(</span><span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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1319
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<pre style="margin: 0;">-<span id="LC1319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="n" style="color: #333;">u</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"equateTys"</span> <span class="n" style="color: #333;">ts</span> <span class="n" style="color: #333;">us</span></span>
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1320
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<pre style="margin: 0;">-<span id="LC1320" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The following line filters out trivial Refl constraints, so that we don't</span></span>
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1321
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<pre style="margin: 0;">-<span id="LC1321" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need to initialise the type oracle that often</span></span>
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1322
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<pre style="margin: 0;">-<span id="LC1322" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">eqType</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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1323
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<pre style="margin: 0;">-<span id="LC1323" class="line" lang="haskell"> <span class="p">]</span></span>
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1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">elementOfUniqSet</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">triviallyInhabitedTyCons</span></span>
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1324
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"></span>
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1325
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1370
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"><span class="cd">-- | All these types are trivially inhabited</span></span>
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1326
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1371
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<pre style="margin: 0;"> <span id="LC1371" class="line" lang="haskell"><span class="n" style="color: #333;">triviallyInhabitedTyCons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSet</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1328,110 +1373,98 @@ triviallyInhabitedTyCons = mkUniqSet [</td>
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1373
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<pre style="margin: 0;"> <span id="LC1373" class="line" lang="haskell"> <span class="n" style="color: #333;">charTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">doubleTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">floatTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">intTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">wordTyCon</span><span class="p">,</span> <span class="n" style="color: #333;">word8TyCon</span></span>
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1329
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1374
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<pre style="margin: 0;"> <span id="LC1374" class="line" lang="haskell"> <span class="p">]</span></span>
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1330
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1375
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<pre style="margin: 0;"> <span id="LC1375" class="line" lang="haskell"></span>
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1331
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<pre style="margin: 0;">-<span id="LC1331" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1332
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<pre style="margin: 0;">-<span id="LC1332" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConTriviallyInhabited</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">elementOfUniqSet</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">triviallyInhabitedTyCons</span></span>
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1333
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<pre style="margin: 0;">-<span id="LC1333" class="line" lang="haskell"></span>
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1334
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<pre style="margin: 0;">-<span id="LC1334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------------</span></span>
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1335
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<pre style="margin: 0;">-<span id="LC1335" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Detecting vacuous types</span></span>
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1336
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<pre style="margin: 0;">-<span id="LC1336" class="line" lang="haskell"></span>
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1337
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking EmptyCase Expressions]</span></span>
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1338
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<pre style="margin: 0;">-<span id="LC1338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1339
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<pre style="margin: 0;">-<span id="LC1339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Empty case expressions are strict on the scrutinee. That is, `case x of {}`</span></span>
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1340
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<pre style="margin: 0;">-<span id="LC1340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will force argument `x`. Hence, `covCheckMatches` is not sufficient for checking</span></span>
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1341
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<pre style="margin: 0;">-<span id="LC1341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">empty cases, because it assumes that the match is not strict (which is true</span></span>
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1342
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<pre style="margin: 0;">-<span id="LC1342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for all other cases, apart from EmptyCase). This gave rise to #10746. Instead,</span></span>
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1343
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<pre style="margin: 0;">-<span id="LC1343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do the following:</span></span>
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1344
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<pre style="margin: 0;">-<span id="LC1344" class="line" lang="haskell"></span>
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1345
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<pre style="margin: 0;">-<span id="LC1345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. We normalise the outermost type family redex, data family redex or newtype,</span></span>
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1346
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> using pmTopNormaliseType (in "GHC.Core.FamInstEnv"). This computes 3</span></span>
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1347
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<pre style="margin: 0;">-<span id="LC1347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> things:</span></span>
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1348
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<pre style="margin: 0;">-<span id="LC1348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a) A normalised type src_ty, which is equal to the type of the scrutinee in</span></span>
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1349
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> source Haskell (does not normalise newtypes or data families)</span></span>
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1350
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<pre style="margin: 0;">-<span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (b) The actual normalised type core_ty, which coincides with the result</span></span>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> topNormaliseType_maybe. This type is not necessarily equal to the input</span></span>
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1352
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<pre style="margin: 0;">-<span id="LC1352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type in source Haskell. And this is precicely the reason we compute (a)</span></span>
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1353
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<pre style="margin: 0;">-<span id="LC1353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and (c): the reasoning happens with the underlying types, but both the</span></span>
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1354
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<pre style="margin: 0;">-<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> patterns and types we print should respect newtypes and also show the</span></span>
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1355
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<pre style="margin: 0;">-<span id="LC1355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family type constructors and not the representation constructors.</span></span>
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1356
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<pre style="margin: 0;">-<span id="LC1356" class="line" lang="haskell"></span>
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1357
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<pre style="margin: 0;">-<span id="LC1357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (c) A list of all newtype data constructors dcs, each one corresponding to a</span></span>
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1358
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<pre style="margin: 0;">-<span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype rewrite performed in (b).</span></span>
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1359
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<pre style="margin: 0;">-<span id="LC1359" class="line" lang="haskell"></span>
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1360
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<pre style="margin: 0;">-<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> For an example see also Note [Type normalisation]</span></span>
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1361
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<pre style="margin: 0;">-<span id="LC1361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in "GHC.Core.FamInstEnv".</span></span>
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1362
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<pre style="margin: 0;">-<span id="LC1362" class="line" lang="haskell"></span>
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1363
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<pre style="margin: 0;">-<span id="LC1363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Function Check.checkEmptyCase' performs the check:</span></span>
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1364
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<pre style="margin: 0;">-<span id="LC1364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - If core_ty is not an algebraic type, then we cannot check for</span></span>
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1365
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<pre style="margin: 0;">-<span id="LC1365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inhabitation, so we emit (_ :: src_ty) as missing, conservatively assuming</span></span>
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1366
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<pre style="margin: 0;">-<span id="LC1366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that the type is inhabited.</span></span>
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1367
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<pre style="margin: 0;">-<span id="LC1367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - If core_ty is an algebraic type, then we unfold the scrutinee to all</span></span>
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1368
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<pre style="margin: 0;">-<span id="LC1368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> possible constructor patterns, using inhabitationCandidates, and then</span></span>
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1369
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<pre style="margin: 0;">-<span id="LC1369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check each one for constraint satisfiability, same as we do for normal</span></span>
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1370
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<pre style="margin: 0;">-<span id="LC1370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern match checking.</span></span>
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1371
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<pre style="margin: 0;">-<span id="LC1371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"><span class="cd">-- | Instantiate a 'ConLike' given its universal type arguments. Instantiates</span></span>
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1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- existential and term binders with fresh variables of appropriate type.</span></span>
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1378
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<pre style="margin: 0;">+<span id="LC1378" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns instantiated type and term variables from the match, type evidence</span></span>
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1379
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and the types of strict constructor fields.</span></span>
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1380
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"><span class="n" style="color: #333;">instCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * 'con' K is a ConLike</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the case of DataCons and most PatSynCons, these</span></span>
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1383
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<pre style="margin: 0;">+<span id="LC1383" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are associated with a particular TyCon T</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - But there are PatSynCons for this is not the case! See #11336, #17112</span></span>
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1385
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1386
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * 'arg_tys' tys are the types K's universally quantified type</span></span>
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1387
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables should be instantiated to.</span></span>
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1388
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - For DataCons and most PatSyns these are the arguments of their TyCon</span></span>
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1389
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - For cases like the PatSyns in #11336, #17112, we can't easily guess</span></span>
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1390
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<pre style="margin: 0;">+<span id="LC1390" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these, so don't call this function.</span></span>
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1391
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<pre style="margin: 0;">+<span id="LC1391" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1392
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After instantiating the universal tyvars of K to tys we get</span></span>
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1393
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<pre style="margin: 0;">+<span id="LC1393" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- K @tys :: forall bs. Q => s1 .. sn -> T tys</span></span>
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1394
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<pre style="margin: 0;">+<span id="LC1394" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that if K is a PatSynCon, depending on arg_tys, T might not necessarily</span></span>
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1395
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be a concrete TyCon.</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Suppose y1 is a strict field. Then we get</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Results: bs</span></span>
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1399
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<pre style="margin: 0;">+<span id="LC1399" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [y1,..,yn]</span></span>
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1400
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<pre style="margin: 0;">+<span id="LC1400" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Q</span></span>
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1401
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [s1]</span></span>
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1402
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"><span class="n" style="color: #333;">instCon</span> <span class="n" style="color: #333;">fuel</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty_st</span><span class="p">}</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1403
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGetFamInstEnvs</span></span>
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1404
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"> <span class="n" style="color: #333;">src_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">normalisedSourceType</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">pmTopNormaliseType</span> <span class="n" style="color: #333;">ty_st</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mb_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">src_ty</span> <span class="n" style="color: #333;">con</span></span>
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1406
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_arg_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1407
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<pre style="margin: 0;">+<span id="LC1407" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1408
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<pre style="margin: 0;">+<span id="LC1408" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">eq_spec</span><span class="p">,</span> <span class="n" style="color: #333;">thetas</span><span class="p">,</span> <span class="n" style="color: #333;">_req_theta</span><span class="p">,</span> <span class="n" style="color: #333;">field_tys</span><span class="p">,</span> <span class="n" style="color: #333;">_con_res_ty</span><span class="p">)</span></span>
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1409
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFullSig</span> <span class="n" style="color: #333;">con</span></span>
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1410
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Substitute universals for type arguments</span></span>
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst_univ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">arg_tys</span></span>
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1412
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate fresh existentials as arguments to the constructor. This is</span></span>
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1413
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- important for instantiating the Thetas and field types.</span></span>
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1414
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneTyVarBndrs</span> <span class="n" style="color: #333;">subst_univ</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">field_tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">field_tys</span></span>
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1416
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate fresh term variables as arguments to the constructor</span></span>
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1417
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">mkPmId</span> <span class="n" style="color: #333;">field_tys'</span></span>
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1418
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All constraints bound by the constructor (alpha-renamed), these are added</span></span>
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1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to the type oracle</span></span>
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1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">gammas</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">eqSpecPreds</span> <span class="n" style="color: #333;">eq_spec</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">thetas</span><span class="p">)</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Finally add everything to nabla</span></span>
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1422
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<pre style="margin: 0;">+<span id="LC1422" class="line" lang="haskell"> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"instCon"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"... ->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">_con_res_ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1425" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">zipWith</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'↦'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1426" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">gammas</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1427
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">))</span> <span class="n" style="color: #333;">arg_ids</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1428" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fuel</span></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"> <span class="p">]</span></span>
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1430
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">runMaybeT</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Case (2) of Note [Strict fields and variables of unlifted type]</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="n" style="color: #333;">con</span></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addPhiTmCt</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PhiConCt</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">gammas</span> <span class="n" style="color: #333;">arg_ids</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1434" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1434
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<pre style="margin: 0;">+<span id="LC1434" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">branching_factor</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterUnliftedFields</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arg_ids</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1435" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1435
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<pre style="margin: 0;">+<span id="LC1435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fuel for the inhabitation test]</span></span>
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1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_fuel</span></span>
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1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">branching_factor</span> <span class="o" style="font-weight: 600;"><=</span> <span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fuel</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1438" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1438
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">min</span> <span class="n" style="color: #333;">fuel</span> <span class="mi" style="color: #099;">2</span></span>
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1439
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"> <span class="n" style="color: #333;">inhabitationTest</span> <span class="n" style="color: #333;">new_fuel</span> <span class="p">(</span><span class="n" style="color: #333;">nabla_ty_st</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="n" style="color: #333;">nabla'</span></span>
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1440
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">nabla</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Could not guess arg_tys. Just assume inhabited</span></span>
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1372
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1441
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<pre style="margin: 0;"> <span id="LC1441" class="line" lang="haskell"></span>
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1373
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<pre style="margin: 0;">-<span id="LC1373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Strict argument type constraints]</span></span>
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1374
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<pre style="margin: 0;">-<span id="LC1374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1375
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the ConVar case of clause processing, each conlike K traditionally</span></span>
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1376
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generates two different forms of constraints:</span></span>
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1377
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<pre style="margin: 0;">-<span id="LC1377" class="line" lang="haskell"></span>
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1378
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A term constraint (e.g., x ~ K y1 ... yn)</span></span>
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1379
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Type constraints from the conlike's context (e.g., if K has type</span></span>
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1380
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall bs. Q => s1 .. sn -> T tys, then Q would be its type constraints)</span></span>
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1381
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<pre style="margin: 0;">-<span id="LC1381" class="line" lang="haskell"></span>
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1382
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<pre style="margin: 0;">-<span id="LC1382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As it turns out, these alone are not enough to detect a certain class of</span></span>
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1383
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<pre style="margin: 0;">-<span id="LC1383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unreachable code. Consider the following example (adapted from #15305):</span></span>
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1384
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<pre style="margin: 0;">-<span id="LC1384" class="line" lang="haskell"></span>
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1385
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<pre style="margin: 0;">-<span id="LC1385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data K = K1 | K2 !Void</span></span>
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1386
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<pre style="margin: 0;">-<span id="LC1386" class="line" lang="haskell"></span>
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1387
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<pre style="margin: 0;">-<span id="LC1387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: K -> ()</span></span>
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1388
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<pre style="margin: 0;">-<span id="LC1388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f K1 = ()</span></span>
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1389
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<pre style="margin: 0;">-<span id="LC1389" class="line" lang="haskell"></span>
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1390
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<pre style="margin: 0;">-<span id="LC1390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though `f` doesn't match on `K2`, `f` is exhaustive in its patterns. Why?</span></span>
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1391
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<td class="diff-line-num new_line old" data-linenumber="1442" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because it's impossible to construct a terminating value of type `K` using the</span></span>
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1392
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<pre style="margin: 0;">-<span id="LC1392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`K2` constructor, and thus it's impossible for `f` to ever successfully match</span></span>
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1393
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<pre style="margin: 0;">-<span id="LC1393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on `K2`.</span></span>
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1394
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<pre style="margin: 0;">-<span id="LC1394" class="line" lang="haskell"></span>
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1395
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<pre style="margin: 0;">-<span id="LC1395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The reason is because `K2`'s field of type `Void` is //strict//. Because there</span></span>
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1396
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<pre style="margin: 0;">-<span id="LC1396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are no terminating values of type `Void`, any attempt to construct something</span></span>
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1397
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<pre style="margin: 0;">-<span id="LC1397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">using `K2` will immediately loop infinitely or throw an exception due to the</span></span>
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1398
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<pre style="margin: 0;">-<span id="LC1398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">strictness annotation. (If the field were not strict, then `f` could match on,</span></span>
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1399
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<pre style="margin: 0;">-<span id="LC1399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">say, `K2 undefined` or `K2 (let x = x in x)`.)</span></span>
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1400
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<pre style="margin: 0;">-<span id="LC1400" class="line" lang="haskell"></span>
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1401
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<pre style="margin: 0;">-<span id="LC1401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since neither the term nor type constraints mentioned above take strict</span></span>
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1402
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<pre style="margin: 0;">-<span id="LC1402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument types into account, we make use of the `nonVoid` function to</span></span>
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1403
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<pre style="margin: 0;">-<span id="LC1403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">determine whether a strict type is inhabitable by a terminating value or not.</span></span>
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1404
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<pre style="margin: 0;">-<span id="LC1404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We call this the "inhabitation test".</span></span>
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1405
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<pre style="margin: 0;">-<span id="LC1405" class="line" lang="haskell"></span>
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1406
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<pre style="margin: 0;">-<span id="LC1406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`nonVoid ty` returns True when either:</span></span>
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1407
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<pre style="margin: 0;">-<span id="LC1407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. `ty` has at least one InhabitationCandidate for which both its term and type</span></span>
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1408
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints are satisfiable, and `nonVoid` returns `True` for all of the</span></span>
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1409
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> strict argument types in that InhabitationCandidate.</span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. We're unsure if it's inhabited by a terminating value.</span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`nonVoid ty` returns False when `ty` is definitely uninhabited by anything</span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(except bottom). Some examples:</span></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* `nonVoid Void` returns False, since Void has no InhabitationCandidates.</span></span>
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1416
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (This is what lets us discard the `K2` constructor in the earlier example.)</span></span>
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1417
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* `nonVoid (Int :~: Int)` returns True, since it has an InhabitationCandidate</span></span>
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1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (through the Refl constructor), and its term constraint (x ~ Refl) and</span></span>
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1419
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type constraint (Int ~ Int) are satisfiable.</span></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* `nonVoid (Int :~: Bool)` returns False. Although it has an</span></span>
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1421
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<pre style="margin: 0;">-<span id="LC1421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> InhabitationCandidate (by way of Refl), its type constraint (Int ~ Bool) is</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not satisfiable.</span></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Given the following definition of `MyVoid`:</span></span>
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1424
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<pre style="margin: 0;">-<span id="LC1424" class="line" lang="haskell"></span>
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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data MyVoid = MkMyVoid !Void</span></span>
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1426
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"></span>
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1427
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `nonVoid MyVoid` returns False. The InhabitationCandidate for the MkMyVoid</span></span>
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1428
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor contains Void as a strict argument type, and since `nonVoid Void`</span></span>
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1429
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> returns False, that InhabitationCandidate is discarded, leaving no others.</span></span>
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1430
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<pre style="margin: 0;">-<span id="LC1430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whether or not a type is inhabited is undecidable in general.</span></span>
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1431
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<pre style="margin: 0;">-<span id="LC1431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Fuel for the inhabitation test].</span></span>
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1432
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For some types, inhabitation is evident immediately and we don't need to</span></span>
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1433
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<pre style="margin: 0;">-<span id="LC1433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> perform expensive tests. See Note [Types that are definitely inhabitable].</span></span>
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1442
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"><span class="cd">-- | Guess the universal argument types of a ConLike from an instantiation of</span></span>
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1443
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- its (normalised!) result type. Rather easy for DataCons, but not so much for</span></span>
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1444
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<pre style="margin: 0;">+<span id="LC1444" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- PatSynCons. See Note [Pattern synonym result type] in "GHC.Core.PatSyn".</span></span>
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1445
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<pre style="margin: 0;">+<span id="LC1445" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">res_ty</span></span>
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1448
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Consider data families: In case of a DataCon, we need to translate to</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the representation TyCon.</span></span>
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1450
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">rep_tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcLookupDataFamInst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">rep_tc</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">dc</span></span>
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1452
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tc_args'</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1453" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1454
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">ps</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1455
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We are successful if we managed to instantiate *every* univ_tv of con.</span></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is difficult and bound to fail in some cases, see</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Pattern synonym result type] in GHC.Core.PatSyn. So we just try our best</span></span>
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1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here and be sure to return an instantiation when we can substitute every</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- universally quantified type variable.</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We *could* instantiate all the other univ_tvs just to fresh variables, I</span></span>
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1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suppose, but that means we get weird field types for which we don't know</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- anything. So we prefer to keep it simple here.</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">con_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">patSynSig</span> <span class="n" style="color: #333;">ps</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcMatchTy</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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1465
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">lookupTyVar</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">univ_tvs</span></span>
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1434
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"></span>
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1467
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1435
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1468
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Fuel for the inhabitation test]</span></span>
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1436
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1469
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<pre style="margin: 0;"> <span id="LC1469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1437
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1470
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<pre style="margin: 0;"> <span id="LC1470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whether or not a type is inhabited is undecidable in general. As a result, we</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1449" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1449,16 +1482,10 @@ construct a terminating value using MkAbyss. But this can't be proven by mere</td>
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1449
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1482
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiation and requires an inductive argument, which `inhabitationTest`</span></span>
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1450
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1483
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<pre style="margin: 0;"> <span id="LC1483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">currently isn't equipped to do.</span></span>
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1451
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1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In order to prevent endless instantiation attempts in @inhabitationTest@, we<span class="idiff left right"> use</span></span></span>
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1453
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the fuel as an upper bound such attempts.</span></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In order to prevent endless instantiation attempts in @inhabitationTest@, we</span></span>
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1486
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">use </span>the fuel as an upper bound such attempts.</span></span>
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1454
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1487
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"></span>
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1455
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<pre style="margin: 0;">-<span id="LC1455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid this sort of conundrum, `nonVoid` uses a simple test to detect the</span></span>
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1456
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<pre style="margin: 0;">-<span id="LC1456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">presence of recursive types (through `checkRecTc`), and if recursion is</span></span>
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1457
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<pre style="margin: 0;">-<span id="LC1457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">detected, we bail out and conservatively assume that the type is inhabited by</span></span>
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1458
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<pre style="margin: 0;">-<span id="LC1458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">some terminating value. This avoids infinite loops at the expense of making</span></span>
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1459
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<pre style="margin: 0;">-<span id="LC1459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the coverage checker incomplete with respect to functions like</span></span>
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1460
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<pre style="margin: 0;">-<span id="LC1460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">stareIntoTheAbyss above. Then again, the same problem occurs with recursive</span></span>
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1461
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<pre style="margin: 0;">-<span id="LC1461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtypes, like in the following code:</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The same problem occurs with recursive newtypes, like in the following code:</span></span>
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1462
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1489
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<pre style="margin: 0;"> <span id="LC1489" class="line" lang="haskell"></span>
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1463
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype Chasm = MkChasm Chasm</span></span>
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1464
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> gazeIntoTheChasm :: Chasm -> a</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1467,18 +1494,19 @@ newtypes, like in the following code:</td>
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1467
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1494
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So this limitation is somewhat understandable.</span></span>
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1468
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1495
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="haskell"></span>
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1469
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1496
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that even with this recursion detection, there is still a possibility that</span></span>
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1470
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<pre style="margin: 0;">-<span id="LC1470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`nonVoid` can run in exponential time. Consider the following data type:</span></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`inhabitationTest` can run in exponential time in the amount of fuel. Consider</span></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the following data type:</span></span>
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1471
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1499
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<pre style="margin: 0;"> <span id="LC1499" class="line" lang="haskell"></span>
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1472
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1500
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<pre style="margin: 0;"> <span id="LC1500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT !T !T !T</span></span>
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1473
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1501
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<pre style="margin: 0;"> <span id="LC1501" class="line" lang="haskell"></span>
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1474
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<pre style="margin: 0;">-<span id="LC1474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we <span class="idiff left right">call `nonVoid` on</span> each of its fields, that will require us to once again</span></span>
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1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we <span class="idiff left right">try to instantiate</span> each of its fields, that will require us to once again</span></span>
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1475
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1503
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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">check if `MkT` is inhabitable in each of those three fields, which in turn will</span></span>
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1476
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1504
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<pre style="margin: 0;"> <span id="LC1504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">require us to check if `MkT` is inhabitable again... As you can see, the</span></span>
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1477
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">branching factor adds up quickly, and if the <span class="idiff left right">recursion depth limit</span> is, say,</span></span>
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1478
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<pre style="margin: 0;">-<span id="LC1478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">100, then <span class="idiff left right">`nonVoid T`</span> will effectively take forever.</span></span>
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1505
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<pre style="margin: 0;">+<span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">branching factor adds up quickly, and if the <span class="idiff left right">initial fuel</span> is, say,</span></span>
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1506
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">100, then <span class="idiff left right">the inhabiation test</span> will effectively take forever.</span></span>
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1479
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>
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1480
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<pre style="margin: 0;">-<span id="LC1480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To mitigate this, we check the branching factor every time we are about to <span class="idiff left right">call</span></span></span>
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1481
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<pre style="margin: 0;">-<span id="LC1481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">`nonVoid` on a list of strict argument types</span>. If the branching factor exceeds 1</span></span>
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1508
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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To mitigate this, we check the branching factor every time we are about to <span class="idiff left right">do</span></span></span>
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1509
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">inhabitation testing in 'instCon'</span>. If the branching factor exceeds 1</span></span>
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1482
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1510
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(i.e., if there is potential for exponential runtime), then we limit the</span></span>
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1483
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1511
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">maximum recursion depth to 1 to mitigate the problem. If the branching factor</span></span>
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1484
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is exactly 1 (i.e., we have a linear chain instead of a tree), then it's okay</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1487,7 +1515,7 @@ to stick with a larger maximum recursion depth.</td>
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1487
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In #17977 we saw that the defaultRecTcMaxBound (100 at the time of writing) was</span></span>
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1488
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<pre style="margin: 0;"> <span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">too large and had detrimental effect on performance of the coverage checker.</span></span>
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given that we only commit to a best effort anyway, we decided to substantially</span></span>
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1490
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<pre style="margin: 0;">-<span id="LC1490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decrement the <span class="idiff left right">recursion depth to 3</span>, at the cost of precision in some edge cases</span></span>
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1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decrement the <span class="idiff left right">fuel to 4</span>, at the cost of precision in some edge cases</span></span>
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1491
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like</span></span>
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1492
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1520
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<pre style="margin: 0;"> <span id="LC1520" class="line" lang="haskell"></span>
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1493
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1521
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Nat = Z | S Nat</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1499" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1499,58 +1527,45 @@ like</td>
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1499
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1527
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since the coverage won't bother to instantiate Down 4 levels deep to see that it</span></span>
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1500
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<td class="diff-line-num new_line" data-linenumber="1528" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is in fact uninhabited, it will emit a inexhaustivity warning for the case.</span></span>
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1501
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1529
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"></span>
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1502
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<pre style="margin: 0;">-<span id="LC1502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Types that are definitely inhabitable]</span></span>
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1503
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<pre style="margin: 0;">-<span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Delaying the Inhabitation test]</span></span>
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1531
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1532
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We delay the inhabitation test that normally happens after having added</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">negative information or a type constraints. This has the potential to do</span></span>
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1534
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">less inhabitation tests for φ constructor constraints, which potentially add a</span></span>
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bunch of ≁⊥ and type constraints at once.</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"></span>
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1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [DataCons that are definitely inhabitable]</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1504
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1539
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<pre style="margin: 0;"> <span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Another microoptimization applies to data types like this one:</span></span>
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1505
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1540
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<pre style="margin: 0;"> <span id="LC1540" class="line" lang="haskell"></span>
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1506
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1541
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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a = S ![a] !T</span></span>
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1507
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="haskell"></span>
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1543
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though there is a strict field of type [a], it's quite silly to call</span></span>
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1509
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<pre style="margin: 0;">-<span id="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">nonVoid</span> on it, since it's "obvious" that it is inhabitable. To make this</span></span>
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1510
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<pre style="margin: 0;">-<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">intuition formal, we say that a <span class="idiff left right">type</span> is definitely inhabitable (DI) if:</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'instCon'</span> on it, since it's "obvious" that it is inhabitable. To make this</span></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">intuition formal, we say that a <span class="idiff left right">DataCon C</span> is definitely inhabitable (DI) if:</span></span>
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1511
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1546
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<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"></span>
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1512
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<pre style="margin: 0;">-<span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * It has at least one constructor C such that:</span></span>
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1513
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<pre style="margin: 0;">-<span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. C has no equality constraints (since they might be unsatisfiable)</span></span>
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1514
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<pre style="margin: 0;">-<span id="LC1514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. C has no strict argument types (since they might be uninhabitable)</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. C has no equality constraints (since they might be unsatisfiable)</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. C has no strict/unlifted argument types (since they might be uninhabitable)</span></span>
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1515
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1549
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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"></span>
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1516
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's relatively cheap to check if a type is DI, so before we call `nonVoid`</span></span>
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1517
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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on a list of strict argument types, we filter out all of the DI ones.</span></span>
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1550
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's relatively cheap to check if a DataCon is DI, so before we call 'instCon'</span></span>
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1551
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on a constructor of a COMPLETE set, we filter out all of the DI ones.</span></span>
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1552
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"></span>
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1553
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<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This fast path shaves down -7% allocations for PmSeriesG, for example.</span></span>
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1518
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1554
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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1519
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1555
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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell"></span>
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1520
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<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------------</span></span>
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1521
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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Providing positive evidence for a Nabla</span></span>
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1556
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Generating inhabitants of a Nabla</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1558" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1558
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1559
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is important for warnings. Roughly corresponds to G in Figure 6 of the</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1522" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1560" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LYG paper, with a few tweaks for better warning messages.</span></span>
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1522
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<td class="diff-line-num new_line" data-linenumber="1561" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1523
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<td class="diff-line-num new_line" data-linenumber="1562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"><span class="cd">-- | @generateInhabitants vs n nabla@ returns a list of</span></span>
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<td class="diff-line-num old_line" data-linenumber="1524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1524
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<td class="diff-line-num new_line" data-linenumber="1563" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- at most @n@ (but perhaps empty) refinements of @nabla@ that instantiate</span></span>
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<td class="diff-line-num old_line" data-linenumber="1525" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1525
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<td class="diff-line-num new_line" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1564
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @vs@ to compatible constructor applications or wildcards.</span></span>
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<td class="diff-line-num old_line" data-linenumber="1526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1526
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<td class="diff-line-num new_line" data-linenumber="1565" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1565
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<pre style="margin: 0;"> <span id="LC1565" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Negative information is only retained if literals are involved or when</span></span>
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<td class="diff-line-num old_line" data-linenumber="1527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1527
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<td class="diff-line-num new_line" data-linenumber="1566" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1566
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<pre style="margin: 0;"> <span id="LC1566" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for recursive GADTs.</span></span>
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1528
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1529" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1529
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO: Reasons why this can't serve as a replacment for 'ensureAllInhabited':</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1530" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1530
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * It only considers match variables, so no let-bindings (easily fixed)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1531" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1531
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * It only splits once, when there is no positive evidence. This is for better</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1532" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1532
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- warning messages; e.g. @[], _:_@ is a better warning than listing concrete</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1533
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- lists not matched for, even though @_:_@ is *not* a concrete value.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1534" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1534
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The assumption is that both wildcards in fact *are* inhabited, otherwise</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1535" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1535
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we wouldn't show it.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1536" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1536
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Similarly the newtype instantiation stuff. If we treated newtypes like</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1537" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1537
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- regular constructors, we'd just say @T _@ instead of</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1538" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1538
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @T (U []), T (U (_:_))@ for a chain of newtypes @T = T U; U = U [Int]@.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1539
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Maybe not even @T _@, but just @_@ when @T@ was not instantiated once.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1540
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * It commits to *one* COMPLETE set.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1541
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1542
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<td class="diff-line-num new_line old" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1542" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- On the other hand, 'ensureAllInhabited'</span></span>
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<pre style="margin: 0;">-<span id="LC1543" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Tracks down *one* concrete inhabitant, even if that means recursing</span></span>
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<pre style="margin: 0;">-<span id="LC1544" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- possibly multiple times. E.g. for @[True]@, we have to instantiate @(:)@</span></span>
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<pre style="margin: 0;">-<span id="LC1545" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and then @True@ and @[]@.</span></span>
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Does not consider the type-evidence from instanting different variables as a whole. I.e., it does *not* backtrack! Instead it instantiates GADT constructor in one variable and then has to re-reck all variables again because of the new type info. Better operate on a incrementally consistent nabla than having to do all this work on every instantiation.</span></span>
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<pre style="margin: 0;">-<span id="LC1547" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Problem: Instantiation changes the domain of SharedDIdEnv. worklist-like approach needed!</span></span>
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1548
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<pre style="margin: 0;">-<span id="LC1548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Also the treatment of residual complete matches is a bit concerning...</span></span>
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1549
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<pre style="margin: 0;">-<span id="LC1549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC1550" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- I'm beginning to think that Nabla should only care for term-level evidence and contradictions, not for the combinatorial problem that arises from considering the type constraints unleashed by instantitation of GADT constructors.</span></span>
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<pre style="margin: 0;">-<span id="LC1551" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Then we could have a 'Nablas' where the invariant holds that there always is at least one concrete inhabited Nabla. compared to not splitting this concrete Nabla off its parent nabla (which has negative info), we maintain two Nablas where before we only had to maintain one. But that's only a constant, not linear like in a completely exploded (structural) approach.</span></span>
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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1567" class="line" lang="haskell"><span class="n" style="color: #333;">generateInhabitants</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Why inhabitationTest doesn't call generateInhabitants]</span></span>
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"><span class="n" style="color: #333;">generateInhabitants</span> <span class="kr" style="font-weight: 600;">_</span> <span class="mi" style="color: #099;">0</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"><span class="n" style="color: #333;">generateInhabitants</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">[</span><span class="n" style="color: #333;">nabla</span><span class="p">]</span></span>
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1571
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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell"><span class="n" style="color: #333;">generateInhabitants</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1651,157 +1666,27 @@ pickApplicableCompleteSets ty rcm = do</td>
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"> <span class="n" style="color: #333;">is_valid</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="n" style="color: #333;">is_valid</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">cl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">guessConLikeUnivTyArgsFromResTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">cl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1654" class="line" lang="haskell"><span class="cd">-- | Finds a representant of the semantic equality class of the given @e@.</span></span>
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<pre style="margin: 0;">-<span id="LC1655" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Which is the @x@ of a @let x = e'@ constraint (with @e@ semantically</span></span>
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1656
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<pre style="margin: 0;">-<span id="LC1656" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equivalent to @e'@) we encountered earlier, or a fresh identifier if</span></span>
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1657
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there weren't any such constraints.</span></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nabla</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">)</span></span>
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1659
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<pre style="margin: 0;">-<span id="LC1659" class="line" lang="haskell"><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;">nabla</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">MkNabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">TmSt</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps</span> <span class="p">}</span> <span class="p">}</span> <span class="n" style="color: #333;">e</span></span>
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1660
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<pre style="margin: 0;">-<span id="LC1660" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1661
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1662
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1663
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">reps'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendCoreMap</span> <span class="n" style="color: #333;">reps</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">rep</span></span>
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1664
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<pre style="margin: 0;">-<span id="LC1664" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nabla'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nabla</span><span class="p">{</span> <span class="n" style="color: #333;">nabla_tm_st</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ts</span><span class="p">{</span> <span class="n" style="color: #333;">ts_reps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reps'</span> <span class="p">}</span> <span class="p">}</span></span>
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1665
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<pre style="margin: 0;">-<span id="LC1665" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">nabla'</span><span class="p">,</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1666
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<pre style="margin: 0;">-<span id="LC1666" class="line" lang="haskell"></span>
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1667
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<pre style="margin: 0;">-<span id="LC1667" class="line" lang="haskell"><span class="cd">-- | Inspects a 'PmCoreCt' @let x = e@ by recording constraints for @x@ based</span></span>
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1668
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<pre style="margin: 0;">-<span id="LC1668" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- on the shape of the 'CoreExpr' @e@. Examples:</span></span>
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1669
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1670
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<pre style="margin: 0;">-<span id="LC1670" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = Just (42, 'z')@ we want to record the</span></span>
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1671
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints @x ~ Just a, a ~ (b, c), b ~ 42, c ~ 'z'@.</span></span>
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1672
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<pre style="margin: 0;">-<span id="LC1672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See 'data_con_app'.</span></span>
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1673
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = unpackCString# "tmp"@ we want to record the literal</span></span>
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1674
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraint @x ~ "tmp"@.</span></span>
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1675
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * For @let x = I# 42@ we want the literal constraint @x ~ 42@. Similar</span></span>
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1676
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<pre style="margin: 0;">-<span id="LC1676" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for other literals. See 'coreExprAsPmLit'.</span></span>
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1677
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Finally, if we have @let x = e@ and we already have seen @let y = e@, we</span></span>
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1678
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- want to record @x ~ y@.</span></span>
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1679
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<pre style="margin: 0;">-<span id="LC1679" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span></span>
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1680
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<pre style="margin: 0;">-<span id="LC1680" class="line" lang="haskell"><span class="n" style="color: #333;">addCoreCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1681
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<pre style="margin: 0;">-<span id="LC1681" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_opts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">initSimpleOpts</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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1682
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<pre style="margin: 0;">-<span id="LC1682" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">e'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">simpl_opts</span> <span class="n" style="color: #333;">e</span></span>
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1683
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<pre style="margin: 0;">-<span id="LC1683" class="line" lang="haskell"> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tracePm</span> <span class="s" style="color: #d14;">"addCoreCt"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span></span>
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1684
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<pre style="margin: 0;">-<span id="LC1684" class="line" lang="haskell"> <span class="n" style="color: #333;">execStateT</span> <span class="p">(</span><span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e'</span><span class="p">)</span> <span class="n" style="color: #333;">nabla</span></span>
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1685
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<pre style="margin: 0;">-<span id="LC1685" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1686
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<pre style="margin: 0;">-<span id="LC1686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Takes apart a 'CoreExpr' and tries to extract as much information about</span></span>
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1687
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<pre style="margin: 0;">-<span id="LC1687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- literals and constructor applications as possible.</span></span>
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1688
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<pre style="margin: 0;">-<span id="LC1688" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1689
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<pre style="margin: 0;">-<span id="LC1689" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Handle newtypes properly, by wrapping the expression in a DataCon</span></span>
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1690
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<pre style="margin: 0;">-<span id="LC1690" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is the right thing for casts involving data family instances and</span></span>
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1691
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- their representation TyCon, though (which are not visible in source</span></span>
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1692
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- syntax). See Note [COMPLETE sets on data families]</span></span>
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1693
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- core_expr x e | pprTrace "core_expr" (ppr x $$ ppr e) False = undefined</span></span>
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1694
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<pre style="margin: 0;">-<span id="LC1694" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cast</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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1695
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<pre style="margin: 0;">-<span id="LC1695" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tick</span> <span class="n" style="color: #333;">_t</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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1696
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<pre style="margin: 0;">-<span id="LC1696" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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1697
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<pre style="margin: 0;">-<span id="LC1697" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">pmLitAsStringLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreExprAsPmLit</span> <span class="n" style="color: #333;">e</span></span>
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1698
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<pre style="margin: 0;">-<span id="LC1698" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">expr_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">stringTy</span></span>
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1699
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<pre style="margin: 0;">-<span id="LC1699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Representation of Strings in TmState]</span></span>
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1700
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<pre style="margin: 0;">-<span id="LC1700" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unpackFS</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1701
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<pre style="margin: 0;">-<span id="LC1701" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need this special case to break a loop with coreExprAsPmLit</span></span>
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1702
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<pre style="margin: 0;">-<span id="LC1702" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise we alternate endlessly between [] and ""</span></span>
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1703
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<pre style="margin: 0;">-<span id="LC1703" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">emptyInScopeSet</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1704
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<pre style="margin: 0;">-<span id="LC1704" class="line" lang="haskell"> <span class="n" style="color: #333;">s'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">mkListExpr</span> <span class="n" style="color: #333;">charTy</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkCharExpr</span> <span class="n" style="color: #333;">s'</span><span class="p">))</span></span>
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1705
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<pre style="margin: 0;">-<span id="LC1705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreExprAsPmLit</span> <span class="n" style="color: #333;">e</span></span>
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1706
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<pre style="margin: 0;">-<span id="LC1706" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span></span>
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1707
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<pre style="margin: 0;">-<span id="LC1707" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">_empty_floats</span><span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">dc</span><span class="p">,</span> <span class="n" style="color: #333;">_arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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1708
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<pre style="margin: 0;">-<span id="LC1708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">exprIsConApp_maybe</span> <span class="n" style="color: #333;">in_scope_env</span> <span class="n" style="color: #333;">e</span></span>
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1709
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<pre style="margin: 0;">-<span id="LC1709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span></span>
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1710
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<pre style="margin: 0;">-<span id="LC1710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Detecting pattern synonym applications in expressions]</span></span>
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1711
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<pre style="margin: 0;">-<span id="LC1711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">e</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataConId_maybe</span> <span class="n" style="color: #333;">x</span></span>
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1712
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<pre style="margin: 0;">-<span id="LC1712" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't consider DataCons flexible variables</span></span>
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1713
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<pre style="margin: 0;">-<span id="LC1713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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1714
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<pre style="margin: 0;">-<span id="LC1714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1715
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<pre style="margin: 0;">-<span id="LC1715" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any other expression. Try to find other uses of a semantically</span></span>
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1716
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<pre style="margin: 0;">-<span id="LC1716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equivalent expression and represent them by the same variable!</span></span>
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1717
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<pre style="margin: 0;">-<span id="LC1717" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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1718
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<pre style="margin: 0;">-<span id="LC1718" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1719
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<pre style="margin: 0;">-<span id="LC1719" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span></span>
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1720
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<pre style="margin: 0;">-<span id="LC1720" class="line" lang="haskell"> <span class="n" style="color: #333;">expr_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">exprFreeVars</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1721
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<pre style="margin: 0;">-<span id="LC1721" class="line" lang="haskell"> <span class="n" style="color: #333;">in_scope_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">expr_in_scope</span><span class="p">,</span> <span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnfolding</span><span class="p">)</span></span>
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1722
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<pre style="margin: 0;">-<span id="LC1722" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's inconvenient to get hold of a global in-scope set</span></span>
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1723
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<pre style="margin: 0;">-<span id="LC1723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here, but it'll only be needed if exprIsConApp_maybe ends</span></span>
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1724
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<pre style="margin: 0;">-<span id="LC1724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- up substituting inside a forall or lambda (i.e. seldom)</span></span>
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1725
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<pre style="margin: 0;">-<span id="LC1725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so using exprFreeVars seems fine. See MR !1647.</span></span>
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1726
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<pre style="margin: 0;">-<span id="LC1726" class="line" lang="haskell"></span>
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1727
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<pre style="margin: 0;">-<span id="LC1727" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | The @e@ in @let x = e@ had no familiar form. But we can still see if</span></span>
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1728
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<pre style="margin: 0;">-<span id="LC1728" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see if we already encountered a constraint @let y = e'@ with @e'@</span></span>
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1729
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<pre style="margin: 0;">-<span id="LC1729" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- semantically equivalent to @e@, in which case we may add the constraint</span></span>
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1730
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<pre style="margin: 0;">-<span id="LC1730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- @x ~ y@.</span></span>
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1731
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<pre style="margin: 0;">-<span id="LC1731" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1732
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<pre style="margin: 0;">-<span id="LC1732" class="line" lang="haskell"> <span class="n" style="color: #333;">equate_with_similar_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1733
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<pre style="margin: 0;">-<span id="LC1733" class="line" lang="haskell"> <span class="n" style="color: #333;">rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">swap</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">representCoreExpr</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">e</span><span class="p">)</span></span>
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1734
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<pre style="margin: 0;">-<span id="LC1734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that @rep == x@ if we encountered @e@ for the first time.</span></span>
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1735
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<pre style="margin: 0;">-<span id="LC1735" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addVarCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">rep</span><span class="p">)</span></span>
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1736
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"></span>
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1737
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span></span>
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1738
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<pre style="margin: 0;">-<span id="LC1738" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1739
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<pre style="margin: 0;">-<span id="LC1739" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">lift</span> <span class="p">(</span><span class="n" style="color: #333;">mkPmId</span> <span class="p">(</span><span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">e</span><span class="p">)))</span></span>
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1740
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<pre style="margin: 0;">-<span id="LC1740" class="line" lang="haskell"> <span class="n" style="color: #333;">core_expr</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">e</span></span>
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1741
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">x</span></span>
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1742
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<pre style="margin: 0;">-<span id="LC1742" class="line" lang="haskell"></span>
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1743
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Look at @let x = K taus theta es@ and generate the following</span></span>
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1744
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<pre style="margin: 0;">-<span id="LC1744" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constraints (assuming universals were dropped from @taus@ before):</span></span>
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1745
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<pre style="margin: 0;">-<span id="LC1745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x ≁ ⊥@ if 'K' is not a Newtype constructor.</span></span>
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1746
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<pre style="margin: 0;">-<span id="LC1746" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@</span></span>
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1747
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<pre style="margin: 0;">-<span id="LC1747" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1748
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<pre style="margin: 0;">-<span id="LC1748" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. @x ~ K as ys@</span></span>
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1749
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<pre style="margin: 0;">-<span id="LC1749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is quite similar to PmCheck.pmConCts.</span></span>
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1750
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<pre style="margin: 0;">-<span id="LC1750" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DataCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1751
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<pre style="margin: 0;">-<span id="LC1751" class="line" lang="haskell"> <span class="n" style="color: #333;">data_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">dc</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1752
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<pre style="margin: 0;">-<span id="LC1752" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConExTyCoVars</span> <span class="n" style="color: #333;">dc</span></span>
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1753
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<pre style="margin: 0;">-<span id="LC1753" class="line" lang="haskell"> <span class="n" style="color: #333;">arty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConSourceArity</span> <span class="n" style="color: #333;">dc</span></span>
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1754
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<pre style="margin: 0;">-<span id="LC1754" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ex_ty_args</span><span class="p">,</span> <span class="n" style="color: #333;">val_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAtList</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="n" style="color: #333;">args</span></span>
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1755
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<pre style="margin: 0;">-<span id="LC1755" class="line" lang="haskell"> <span class="n" style="color: #333;">ex_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">exprToType</span> <span class="n" style="color: #333;">ex_ty_args</span></span>
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1756
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<pre style="margin: 0;">-<span id="LC1756" class="line" lang="haskell"> <span class="n" style="color: #333;">vis_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reverse</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">take</span> <span class="n" style="color: #333;">arty</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">val_args</span></span>
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1757
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<pre style="margin: 0;">-<span id="LC1757" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq_supply</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getUniqueSupplyM</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1758" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1758
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<pre style="margin: 0;">-<span id="LC1758" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cloneTyVarBndrs</span> <span class="p">(</span><span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">dc_ex_tvs</span> <span class="n" style="color: #333;">uniq_supply</span></span>
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1759
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<pre style="margin: 0;">-<span id="LC1759" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equateTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">ex_tys</span></span>
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1760
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<pre style="margin: 0;">-<span id="LC1760" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. @x ≁ ⊥@ if 'K' is not a Newtype constructor (#18341)</span></span>
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1761
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<pre style="margin: 0;">-<span id="LC1761" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isNewDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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1762
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<pre style="margin: 0;">-<span id="LC1762" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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1763
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<pre style="margin: 0;">-<span id="LC1763" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. @a_1 ~ tau_1, ..., a_n ~ tau_n@ for fresh @a_i@. See also #17703</span></span>
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1764
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<pre style="margin: 0;">-<span id="LC1764" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addPhiCtsNoTest</span> <span class="n" style="color: #333;">nabla</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">ty_cts</span><span class="p">)</span></span>
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1765
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<pre style="margin: 0;">-<span id="LC1765" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 3. @y_1 ~ e_1, ..., y_m ~ e_m@ for fresh @y_i@</span></span>
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1766
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<pre style="margin: 0;">-<span id="LC1766" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_ids</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">bind_expr</span> <span class="n" style="color: #333;">vis_args</span></span>
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1767
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<pre style="margin: 0;">-<span id="LC1767" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 4. @x ~ K as ys@</span></span>
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1768
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<pre style="margin: 0;">-<span id="LC1768" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltConLike</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dc</span><span class="p">))</span> <span class="n" style="color: #333;">ex_tvs</span> <span class="n" style="color: #333;">arg_ids</span></span>
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1769
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<pre style="margin: 0;">-<span id="LC1769" class="line" lang="haskell"></span>
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1770
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<pre style="margin: 0;">-<span id="LC1770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds a literal constraint, i.e. @x ~ 42@.</span></span>
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1771
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<pre style="margin: 0;">-<span id="LC1771" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Also we assume that literal expressions won't diverge, so this</span></span>
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1772
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<pre style="margin: 0;">-<span id="LC1772" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will add a @x ~/ ⊥@ constraint.</span></span>
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1773
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<pre style="margin: 0;">-<span id="LC1773" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1774
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<pre style="margin: 0;">-<span id="LC1774" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_lit</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">lit</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1775
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<pre style="margin: 0;">-<span id="LC1775" class="line" lang="haskell"> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addNotBotCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span></span>
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1776
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<pre style="margin: 0;">-<span id="LC1776" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PmAltLit</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1777
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<pre style="margin: 0;">-<span id="LC1777" class="line" lang="haskell"></span>
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1778
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<pre style="margin: 0;">-<span id="LC1778" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Adds the given constructor application as a solution for @x@.</span></span>
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1779
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<pre style="margin: 0;">-<span id="LC1779" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PmAltCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Id</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="kt" style="color: #458; font-weight: 600;">Nabla</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span><span class="p">)</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC1780" class="line" lang="haskell"> <span class="n" style="color: #333;">pm_alt_con_app</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">nabla</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">addConCt</span> <span class="n" style="color: #333;">nabla</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC1781" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1782" class="line" lang="haskell"><span class="cd">-- | Like 'modify', but with an effectful modifier action</span></span>
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<pre style="margin: 0;">-<span id="LC1783" class="line" lang="haskell"><span class="n" style="color: #333;">modifyT</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">m</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1784
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<pre style="margin: 0;">-<span id="LC1784" class="line" lang="haskell"><span class="n" style="color: #333;">modifyT</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">StateT</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">fmap</span> <span class="p">((,)</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">f</span></span>
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<pre style="margin: 0;">-<span id="LC1785" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Detecting pattern synonym applications in expressions]</span></span>
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Why inhabitationTest doesn't call generateInhabitants]</span></span>
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At the moment we fail to detect pattern synonyms in scrutinees and RHS of</span></span>
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<pre style="margin: 0;">-<span id="LC1789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">guards. This could be alleviated with considerable effort and complexity, but</span></span>
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<pre style="margin: 0;">-<span id="LC1790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the returns are meager. Consider:</span></span>
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<pre style="margin: 0;">-<span id="LC1791" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern P</span></span>
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<pre style="margin: 0;">-<span id="LC1793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Q</span></span>
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<pre style="margin: 0;">-<span id="LC1794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case P 15 of</span></span>
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<pre style="margin: 0;">-<span id="LC1795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Q _ -> ...</span></span>
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<pre style="margin: 0;">-<span id="LC1796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> P 15 -></span></span>
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<pre style="margin: 0;">-<span id="LC1797" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Compared to the situation where P and Q are DataCons, the lack of generativity</span></span>
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<pre style="margin: 0;">-<span id="LC1799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">means we could never flag Q as redundant. (also see Note [Undecidable Equality</span></span>
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1800
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<pre style="margin: 0;">-<span id="LC1800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for PmAltCons] in PmTypes.) On the other hand, if we fail to recognise the</span></span>
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1801
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<pre style="margin: 0;">-<span id="LC1801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pattern synonym, we flag the pattern match as inexhaustive. That wouldn't happen</span></span>
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1802
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<pre style="margin: 0;">-<span id="LC1802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if we had knowledge about the scrutinee, in which case the oracle basically</span></span>
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1803
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<pre style="margin: 0;">-<span id="LC1803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">knows "If it's a P, then its field is 15".</span></span>
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1804
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<pre style="margin: 0;">-<span id="LC1804" class="line" lang="haskell"></span>
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1805
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<pre style="margin: 0;">-<span id="LC1805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a pretty narrow use case and I don't think we should to try to fix it</span></span>
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1806
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<pre style="margin: 0;">-<span id="LC1806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until a user complains energetically.</span></span>
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1671
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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Every now and then I forget why 'inhabitationTest' (IT) and</span></span>
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1672
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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'generateInhabitants' (GI) can't share more code. Here are a few pain points I</span></span>
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1673
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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">found out about the hard way:</span></span>
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1674
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"></span>
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1675
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<pre style="margin: 0;">+<span id="LC1675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * GI only considers match variables, so no let-bindings. Could probably be fixed.</span></span>
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1676
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * GI only explodes a pattern once, when there is no positive evidence. This</span></span>
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1677
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is for better warning messages; e.g. @[], _:_@ is a better warning than</span></span>
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1678
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<pre style="margin: 0;">+<span id="LC1678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> listing concrete lists not matched for, even though @_:_@ is *not* a</span></span>
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1679
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<pre style="margin: 0;">+<span id="LC1679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> concrete value. The assumption is that both wildcards in fact *are*</span></span>
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1680
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<pre style="margin: 0;">+<span id="LC1680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inhabited, otherwise we wouldn't show it. That implies that the</span></span>
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1681
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<pre style="margin: 0;">+<span id="LC1681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (recursive!) IT has pruned the nabla before.</span></span>
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1682
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<pre style="margin: 0;">+<span id="LC1682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Similarly the newtype instantiation stuff. If GI treated newtypes like</span></span>
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1683
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<pre style="margin: 0;">+<span id="LC1683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> regular constructors, we'd just say @T _@ instead of</span></span>
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1684
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> @T (U []), T (U (_:_))@ for a chain of newtypes @T = T U; U = U [Int]@.</span></span>
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1685
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<pre style="margin: 0;">+<span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Maybe not even @T _@, but just @_@ when @T@ was not instantiated once.</span></span>
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1686
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<pre style="margin: 0;">+<span id="LC1686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * GI commits to *one* COMPLETE set, and goes through some hoops to find</span></span>
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1687
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<pre style="margin: 0;">+<span id="LC1687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the minimal one. This implies it has to look at *all* constructors in</span></span>
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<pre style="margin: 0;">+<span id="LC1688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the residual COMPLETE matches and see if they match. Completely</span></span>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> untractable for an efficient IT.</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Feel free to add more.</span></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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