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<h3>
Ben Gamari pushed to branch wip/T18126
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/b9c66bd345539ebf828819a538b03171128408d0">b9c66bd3</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-09-14T14:00:49-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Silence unused binder warning
It looks to me like the intent here is merely to invoke the occurrence
check and that we do not need the expanded type.
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<h4>1 changed file:</h4>
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<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<h4>Changes:</h4>
<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9c66bd345539ebf828819a538b03171128408d0#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="858" 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="858" 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">@@ -858,7 +858,7 @@ qlUnify delta ty1 ty2</td>
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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;">ty2_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">shallowTyCoVarsOfType</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC859" 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;">ty2_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bvs2</span><span class="p">)</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;">-- Can't instantiate a delta-varto a forall-bound variable</span></span>
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<pre style="margin: 0;">-<span id="LC861" 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;">ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">kappa</span><span class="p">]</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC861" 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;"><span class="idiff left right">_</span>ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">kappa</span><span class="p">]</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Passes the occurs check</span></span>
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<pre style="margin: 0;"> <span id="LC863" 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;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">))</span> <span class="n" style="color: #333;">ty2_kind</span> <span class="n" style="color: #333;">kappa_kind</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;">-- unifyKind: see Note [Actual unification in qlUnify]</span></span>
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