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<h3>
Marge Bot pushed to branch master
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/0345b1b0f62c8fac72d07a7b848d14b9893e9ac9">0345b1b0</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2019-06-11T03:52:10Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only: document newtypes' DataConWrapId
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<h4>1 changed file:</h4>
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compiler/basicTypes/MkId.hs
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<h4>Changes:</h4>
<li id="2f8fee2abca5d63f3b2a113efc849e4e6054c49a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/0345b1b0f62c8fac72d07a7b848d14b9893e9ac9#2f8fee2abca5d63f3b2a113efc849e4e6054c49a"><strong>compiler/basicTypes/MkId.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">@@ -298,6 +298,24 @@ so the data constructor for T:C had a single argument, namely the</td>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">predicate (C a). But now we treat that as an ordinary argument, not</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">part of the theta-type, so all is well.</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"></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;">Note [Newtype workers]</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;">~~~~~~~~~~~~~~~~~~~~~~</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;">A newtype does not really have a worker. Instead, newtype constructors</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;">just unfold into a cast. But we need *something* for, say, MkAge to refer</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to. So, we do this:</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"></span>
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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 Id used as the newtype worker will have a compulsory unfolding to</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a cast. See Note [Compulsory newtype unfolding]</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This Id is labeled as a DataConWrapId. We don't want to use a DataConWorkId,</span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as those have special treatment in the back end.</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* There is no top-level binding, because the compulsory unfolding</span></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;"> means that it will be inlined (to a cast) at every call site.</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"></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;">We probably should have a NewtypeWorkId, but these Ids disappear as soon as</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we desugar anyway, so it seems a step too far.</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Compulsory newtype unfolding]</span></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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Newtype wrappers, just like workers, have compulsory unfoldings.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="447" 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">@@ -447,6 +465,8 @@ mkDataConWorkId :: Name -> DataCon -> Id</td>
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447
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465
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"><span class="n" style="color: #333;">mkDataConWorkId</span> <span class="n" style="color: #333;">wkr_name</span> <span class="n" style="color: #333;">data_con</span></span>
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448
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466
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="n" style="color: #333;">tycon</span></span>
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449
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGlobalId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataConWrapId</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span> <span class="n" style="color: #333;">wkr_name</span> <span class="n" style="color: #333;">wkr_ty</span> <span class="n" style="color: #333;">nt_work_info</span></span>
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<pre style="margin: 0;">+<span id="LC468" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Newtype workers]</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC470" 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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451
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGlobalId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataConWorkId</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span> <span class="n" style="color: #333;">wkr_name</span> <span class="n" style="color: #333;">wkr_ty</span> <span class="n" style="color: #333;">alg_wkr_info</span></span>
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472
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"></span>
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