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<h3>

Richard Eisenberg pushed to branch wip/cfuneqcan-refactor

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dc45fd5c0cedb3b473d59e7916aeb7ad042ea7e">0dc45fd5</a></strong>

<div>

<span>by Richard Eisenberg</span>

<i>at 2020-11-12T16:42:41-05:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Really remove (2b)

</pre>

</li>

</ul>

<h4>2 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">

compiler/GHC/Core/Type.hs

</a>

</li>

<li class="file-stats">

<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">

compiler/GHC/Tc/Solver/Canonical.hs

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dc45fd5c0cedb3b473d59e7916aeb7ad042ea7e#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1981" 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="1981" 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">@@ -1981,6 +1981,8 @@ buildSynTyCon name binders res_kind roles rhs</td>

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<td class="diff-line-num old_line" data-linenumber="1981" 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">

1981

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<td class="diff-line-num new_line" data-linenumber="1981" 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">

1981

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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell">    <span class="n" style="color: #333;">is_fam_free</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isFamFreeTy</span> <span class="n" style="color: #333;">rhs</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1982" 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">

1982

</td>

<td class="diff-line-num new_line" data-linenumber="1982" 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">

1982

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<pre style="margin: 0;"> <span id="LC1982" class="line" lang="haskell">    <span class="n" style="color: #333;">is_forgetful</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">binders</span> <span class="o" style="font-weight: 600;">||</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1983" 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">

1983

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<td class="diff-line-num new_line" data-linenumber="1983" 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">

1983

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<pre style="margin: 0;"> <span id="LC1983" class="line" lang="haskell">                   <span class="n" style="color: #333;">uniqSetAny</span> <span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">tyConsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1984" 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">

1984

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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- NB: This is allowed to be conservative, returning True more often</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1984" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1985" 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">

1985

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<pre style="margin: 0;">+<span id="LC1985" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- than it should. See comments on GHC.Core.TyCon.isForgetfulSynTyCon</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1984" 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">

1984

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<td class="diff-line-num new_line" data-linenumber="1986" 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">

1986

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<pre style="margin: 0;"> <span id="LC1986" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1985" 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">

1985

</td>

<td class="diff-line-num new_line" data-linenumber="1987" 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">

1987

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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1986" 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">

1986

</td>

<td class="diff-line-num new_line" data-linenumber="1988" 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">

1988

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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>

</pre>

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<br>

</li>

<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dc45fd5c0cedb3b473d59e7916aeb7ad042ea7e#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="50" 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="50" 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">@@ -50,7 +50,7 @@ import GHC.Utils.Misc</td>

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<td class="diff-line-num old_line" data-linenumber="50" 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">

50

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<td class="diff-line-num new_line" data-linenumber="50" 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">

50

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="51" 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">

51

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<td class="diff-line-num new_line" data-linenumber="51" 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">

51

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="52" 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">

52

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<td class="diff-line-num new_line" data-linenumber="52" 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">

52

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="53" 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">

53

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<td class="diff-line-num new_line old" data-linenumber="53" 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="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="54" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="53" 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">

53

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">isNothing</span></span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="54" 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">

54

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<td class="diff-line-num new_line" data-linenumber="54" 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">

54

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span>  <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zip4</span> <span class="p">)</span></span>

</pre>

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55

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55

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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>

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<pre style="margin: 0;"> <span id="LC56" 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">@@ -108,26 +108,6 @@ canonicalize (CQuantCan (QCI { qci_ev = ev, qci_pend_sc = pend_sc }))</td>

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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canForAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pend_sc</span></span>

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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">status</span> <span class="p">})</span></span>

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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"  | BlockedCIS holes <- status</span></span>

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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  , isEmptyUniqSet holes</span></span>

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<pre style="margin: 0;">-<span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    -- this would be a CEqCan if it weren't for the blocking hole, but that</span></span>

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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    -- block has been removed. Warp straight to canEqCanLHSHomo.</span></span>

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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    -- See Wrinkle (2b) of Note [Equalities with incompatible kinds]</span></span>

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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  = do { pred_ty <- zonkTcType (ctEvPred ev) -- zonk to remove the filled-in coercion</span></span>

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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                             -- hole. Could flatten, but why bother?</span></span>

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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; case classifyPredType pred_ty of</span></span>

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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">           EqPred eq_rel ty1 ty2</span></span>

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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             | Just lhs <- canEqLHS_maybe ty1</span></span>

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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             -> canEqCanLHSHomo ev eq_rel NotSwapped lhs ty1 ty2 ty2</span></span>

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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- the work item was indeed kicked out because the blocking coercion</span></span>

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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- hole got filled in. But perhaps an intervening work item unified</span></span>

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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- a variable in the LHS. We're not in the looping case of Wrinkle (2b),</span></span>

</pre>

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126

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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- so just go via the general path</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="127" 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">

127

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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">           _ -> canIrred status ev }</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="128" 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">

128

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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- NB: The Irred is /not/ insoluble, so the special case below</span></span>

</pre>

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129

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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            -- for insolubles (the direct call to canEqNC) does not apply.</span></span>

</pre>

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130

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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="131" 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">

131

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111

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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="132" 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">

132

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<td class="diff-line-num new_line" data-linenumber="112" 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">

112

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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- For insolubles (all of which are equalities), do /not/ flatten the arguments</span></span>

</pre>

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133

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<td class="diff-line-num new_line" data-linenumber="113" 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">

113

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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- In #14350 doing so led entire-unnecessary and ridiculously large</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="999" 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="979" 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">@@ -999,10 +979,10 @@ can_eq_nc' _flat rdr_env envs ev eq_rel ty1 ps_ty1 ty2 ps_ty2</td>

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999

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979

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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1000" 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">

1000

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<td class="diff-line-num new_line" data-linenumber="980" 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">

980

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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Then, get rid of casts</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1001" 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">

1001

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<td class="diff-line-num new_line" data-linenumber="981" 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">

981

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<pre style="margin: 0;"> <span id="LC981" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ps_ty2</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1002" 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">

1002

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<td class="diff-line-num new_line old" data-linenumber="982" 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="LC1002" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">isTyVarTy</span></span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- See (3) in Note [Equalities with incompatible kinds]</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1003" 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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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">isNothing</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">canEqLHS_maybe</span></span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- See (3) in Note [Equalities with incompatible kinds]</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="983" 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">

983

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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canEqCast</span> <span class="n" style="color: #333;">flat</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ps_ty2</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1004" 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">

1004

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<td class="diff-line-num new_line" data-linenumber="984" 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">

984

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<pre style="margin: 0;"> <span id="LC984" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ps_ty1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>

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1005

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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">isTyVarTy</span></span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- See (3) in Note [Equalities with incompatible kinds]</span></span>

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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">isNothing</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff right">canEqLHS_maybe</span></span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- See (3) in Note [Equalities with incompatible kinds]</span></span>

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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canEqCast</span> <span class="n" style="color: #333;">flat</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">co2</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ps_ty1</span></span>

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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"></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;">----------------------</span></span>

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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          Alternatively, we could be careful not to do unnecessary swaps during</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          canonicalisation, but that seems hard to do, in general.</span></span>

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<pre style="margin: 0;"> <span id="LC2547" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     (2b) Consider this case:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             [G] co_given :: k1 ~ k2</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             [W] w :: (alpha :: k1) ~ (T a b c :: k2)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          Processing the Wanted, we will eventually get to canEqCanLHSHetero,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          which will produce</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2573" 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="LC2573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             [W] co_abc :: k2 ~ k1</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          leaving the Wanted to become</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2575" 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="LC2575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             [W] w2 :: alpha ~ (T a b c |> co_abc)</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          When co_abc gets picked off the work list, it will get solved,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC2577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          kicking out w2. But canonicalising w2 strips off the cast (toward the</span></span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          top of can_eq_nc') and then the process repeats.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2579" 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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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2579" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2580" 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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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          Instead, when we're canonicalising something that was made into</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2581" 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">

2581

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          an Irred only because of a blocking coercion (that is, with BlockedCIS),</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2582" 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">

2582

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          we just jump straight to canEqCanLHSHomo. You might think we can go</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2583" 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">

2583

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          straight to canEqCanLHSFinish, but there's a chance that a blocking</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2584" 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">

2584

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          coercion hole interfered with the checkTyVarEq call in canEqTyVarFunEq,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2585" 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">

2585

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">          so we have to start above that call.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2586" 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">

2586

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<td class="diff-line-num new_line old" data-linenumber="2548" 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="LC2586" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2587" 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">

2587

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2548

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<pre style="margin: 0;"> <span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (3) Suppose we have [W] (a :: k1) ~ (rhs :: k2). We duly follow the</span></span>

</pre>

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2588

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<td class="diff-line-num new_line" data-linenumber="2549" 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">

2549

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<pre style="margin: 0;"> <span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     algorithm detailed here, producing [W] co :: k2 ~ k1, and adding</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2589" 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">

2589

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<td class="diff-line-num new_line" data-linenumber="2550" 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">

2550

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<pre style="margin: 0;"> <span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     [W] (a :: k1) ~ ((rhs |> co) :: k1) to the irreducibles. Some time</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2594" 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="2555" 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">@@ -2594,7 +2555,9 @@ Wrinkles:</td>

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<pre style="margin: 0;"> <span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     is heterogeneous again, and the process repeats.</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="2556" 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">

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<pre style="margin: 0;"> <span id="LC2556" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2596" 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">

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<pre style="margin: 0;"> <span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     To avoid this, we don't strip casts off a type if the other type</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="2597" 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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<td class="diff-line-num new_line old" data-linenumber="2558" 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="LC2597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     in the equality is a tyvar. And this is an improvement regardless:</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2598" 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="2558" 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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<pre style="margin: 0;">+<span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     in the equality is a CanEqLHS (the scenario above can happen with a</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2598" 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="2559" 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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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     type family, too. testcase: typecheck/should_compile/T13822).</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="2560" 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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<pre style="margin: 0;">+<span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     And this is an improvement regardless:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2598" 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">

2598

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<td class="diff-line-num new_line" data-linenumber="2561" 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">

2561

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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     because tyvars can, generally, unify with casted types, there's no</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="2599" 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">

2599

</td>

<td class="diff-line-num new_line" data-linenumber="2562" 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">

2562

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<pre style="margin: 0;"> <span id="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     reason to go through the work of stripping off the cast when the</span></span>

</pre>

</td>

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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="2600" 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">

2600

</td>

<td class="diff-line-num new_line" data-linenumber="2563" 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">

2563

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC2563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     cast appears opposite a tyvar. This is implemented in the cast case</span></span>

</pre>

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