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<h3>
Simon Peyton Jones pushed to branch wip/T18126-deep
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/9d4776a58ca36f1070fba81ed1fce194944fd065">9d4776a5</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T14:54:27+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More wibbles to make ($) work
This all relates to 5.4
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78b4c82c30d28e3eb11d05beaee1a03267661482">78b4c82c</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-05-29T15:18:32+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More wibbles
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<h4>3 changed files:</h4>
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<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<a href="#fa8150a02afc8d7030a5c769256631c5d43f9d76">
testsuite/tests/impredicative/all.T
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testsuite/tests/impredicative/cabal-example.hs
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<h4>Changes:</h4>
<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/eae80258c718ee303910818acf715e78a98a7f59...78b4c82c30d28e3eb11d05beaee1a03267661482#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="155" 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">@@ -155,8 +155,7 @@ data TcPass = TcpRn -- Arguments decomposed</td>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcPass</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="156" 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="LC156" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="c1" style="color: #998; font-style: italic;">-- Of the function</span></span>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="n" style="color: #333;">p</span></span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XEType</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_gd</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XEType</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ETypeArg</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="c1" style="color: #998; font-style: italic;">-- Of the function</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="180" 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="179" 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">@@ -180,7 +179,7 @@ data EValArg (p :: TcPass) where</td>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">mkEValArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">mkEValArg</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eva_gd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="n" style="color: #333;">p</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">'Renamed</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">@@ -196,9 +195,8 @@ type family XEWrap p where</td>
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196
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">XEWrap</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;">HsWrapper</span></span>
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197
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196
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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"></span>
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198
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197
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">OutputableBndrId</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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199
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">eva_gd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gd</span> <span class="p">})</span></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"EValArg"</span> <span class="o" style="font-weight: 600;"><></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">gd</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(gd)"</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(un-gd)"</span></span>
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg</span> <span class="p">})</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"EValArg"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span></span>
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202
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EPrag</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"EPrag"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">p</span></span>
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203
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ETypeArg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hs_ty</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;">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;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EPar</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;">text</span> <span class="s" style="color: #d14;">"EPar"</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">@@ -315,8 +313,7 @@ tcInferSigmaTy (L loc rn_expr)</td>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">impred</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ImpredicativeTypes</span></span>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rn_args'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeAddGuardFlags</span> <span class="n" style="color: #333;">impred</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">_delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args'</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">_delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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320
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317
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">_tc_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcValArgs</span> <span class="n" style="color: #333;">impred</span> <span class="n" style="color: #333;">tc_fun</span> <span class="n" style="color: #333;">inst_args</span></span>
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321
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318
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">app_res_sigma</span> <span class="p">}</span></span>
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322
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319
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="325" 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">@@ -328,8 +325,7 @@ tcApp rn_expr exp_res_ty</td>
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328
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325
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_fun</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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329
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326
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"></span>
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330
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327
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate</span></span>
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331
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rn_args'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeAddGuardFlags</span> <span class="n" style="color: #333;">impred</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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332
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<pre style="margin: 0;">-<span id="LC332" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args'</span></span>
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328
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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="n" style="color: #333;">impred</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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333
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329
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<pre style="margin: 0;"> <span id="LC329" class="line" lang="haskell"></span>
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334
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330
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Quick look at result</span></span>
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335
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331
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">impred</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">delta</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="593" 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="589" 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">@@ -593,11 +589,13 @@ tcInstFun impred_on inst_final rn_fun fun_sigma rn_args</td>
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593
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589
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">delta'</span> <span class="n" style="color: #333;">acc'</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty'</span> <span class="n" style="color: #333;">args</span> <span class="p">}</span></span>
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594
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590
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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"></span>
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595
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591
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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"> <span class="n" style="color: #333;">go1</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">so_far</span> <span class="n" style="color: #333;">fun_ty</span></span>
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596
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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eva</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">arg</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eva_gd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">guarded</span></span> <span class="p">})</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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592
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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">eva</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">ValArg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg</span></span> <span class="p">})</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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597
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<pre style="margin: 0;"> <span id="LC593" 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="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">matchActualFunTy</span> <span class="n" style="color: #333;">herald</span></span>
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<pre style="margin: 0;"> <span id="LC594" 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;">rn_fun</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">n_val_args</span><span class="p">,</span> <span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">val_arg</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">quickLookArg</span> <span class="n" style="color: #333;">impred_on</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;">-<span id="LC600" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">acc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eva</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">val_arg</span><span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span></span>
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595
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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">delta'</span><span class="p">,</span> <span class="n" style="color: #333;">arg'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">impred_on</span></span>
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596
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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">quickLookArg</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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597
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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">acc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eva</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg'</span><span class="p">,</span> <span class="n" style="color: #333;">eva_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">addArgWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">delta'</span> <span class="n" style="color: #333;">acc'</span> <span class="p">(</span><span class="n" style="color: #333;">arg_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">so_far</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rest_args</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC601" 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">@@ -732,61 +730,41 @@ and we had the visible type application</td>
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<pre style="margin: 0;"> <span id="LC730" 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="LC731" 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="LC732" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddGuardFlags</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"><span class="n" style="color: #333;">maybeAddGuardFlags</span> <span class="n" style="color: #333;">impred</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">impred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">addGuardFlags</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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739
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<pre style="margin: 0;">-<span id="LC739" 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;">args</span> <span class="c1" style="color: #998; font-style: italic;">-- No Quick Look, no need to add guardedness</span></span>
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="haskell"><span class="n" style="color: #333;">addGuardFlags</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC743" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> there are no free quantified variables</span></span>
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the result of the call</span></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"><span class="n" style="color: #333;">addGuardFlags</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="n" style="color: #333;">findNoKappa</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">HsExprArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpRn</span><span class="p">]</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="LC734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> there are no free quantified variables</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the result of the call</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="n" style="color: #333;">findNoKappa</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="haskell"> <span class="n" style="color: #333;">need_instantiation</span> <span class="kt" style="color: #458; font-weight: 600;">[]</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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<pre style="margin: 0;"> <span id="LC740" class="line" lang="haskell"> <span class="n" style="color: #333;">need_instantiation</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="kr" style="font-weight: 600;">_</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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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"> <span class="n" style="color: #333;">need_instantiation</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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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC744" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">need_instantiation</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC746" 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;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">theta</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC756" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bvs</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bvs</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC758" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">fun_ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC759" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">fun_ty</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bvs</span></span>
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<pre style="margin: 0;">-<span id="LC760" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span></span>
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749
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">fun_ty</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;">tyCoVarsOfType</span> <span class="n" style="color: #333;">fun_ty</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bvs</span></span>
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750
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC762" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EPar</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{})</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bvs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">acc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC763" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EPrag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{})</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bvs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">acc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">fun_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EPar</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bvs</span></span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">fun_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EPrag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bvs</span></span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC765" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ETypeArg</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{})</span></span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;"><span class="idiff left">fun_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ETypeArg</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{}</span></span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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755
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">body1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitSomeForAllTys</span> <span class="p">(</span><span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Inferred</span><span class="p">)</span> <span class="n" style="color: #333;">fun_ty</span></span>
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767
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756
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">body2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">body1</span></span>
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768
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<td class="diff-line-num new_line" data-linenumber="757" 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">
757
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<pre style="margin: 0;"> <span id="LC757" 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;">null</span> <span class="n" style="color: #333;">tvbs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">theta</span><span class="p">)</span></span>
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769
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<td class="diff-line-num new_line old" data-linenumber="758" 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="LC769" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bvs</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">tvbs</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">body2</span> <span class="n" style="color: #333;">args</span></span>
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758
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">bvs</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">tvbs</span><span class="p">)</span> <span class="n" style="color: #333;">body2</span> <span class="n" style="color: #333;">args</span></span>
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770
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759
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<pre style="margin: 0;"> <span id="LC759" 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;">_tv</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitForAllTy_maybe</span> <span class="n" style="color: #333;">fun_ty</span></span>
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771
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<pre style="margin: 0;">-<span id="LC771" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">arg</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="n" style="color: #333;"><span class="idiff">acc</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rest_args</span></span>
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760
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rest_args</span></span>
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772
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761
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"></span>
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773
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">acc</span> <span class="n" style="color: #333;">fun_ty</span> <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="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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774
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<pre style="margin: 0;">-<span id="LC774" 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;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitFunTy_maybe</span> <span class="n" style="color: #333;">fun_ty</span></span>
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775
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_gd</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGuardedTy</span> <span class="n" style="color: #333;">arg_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span></span>
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776
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<pre style="margin: 0;">-<span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rest_args</span></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">fun_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rest_args</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="763" 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">
763
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<pre style="margin: 0;">+<span id="LC763" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitFunTy_maybe</span> <span class="n" style="color: #333;">fun_ty</span></span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">rest_args</span></span>
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777
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765
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"></span>
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778
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;"><span class="idiff left">acc</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">bale_out</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">acc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">args</span></span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span></span>
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"> <span class="n" style="color: #333;">bale_out</span> <span class="n" style="color: #333;">acc</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC781" class="line" lang="haskell"> <span class="n" style="color: #333;">bale_out</span> <span class="n" style="color: #333;">acc</span> <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="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bale_out</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span> <span class="p">{</span> <span class="n" style="color: #333;">eva_gd</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"> <span class="n" style="color: #333;">bale_out</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="o" style="font-weight: 600;">:</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;">bale_out</span> <span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">acc</span><span class="p">)</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="n" style="color: #333;">isGuardedTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</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="LC786" class="line" lang="haskell"><span class="n" style="color: #333;">isGuardedTy</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC787" 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;">tc</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;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGenerativeTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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<pre style="margin: 0;">-<span id="LC788" 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="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitAppTy_maybe</span> <span class="n" style="color: #333;">ty</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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<pre style="margin: 0;">-<span id="LC789" 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="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"><span class="cm" 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">@@ -798,20 +776,45 @@ isGuardedTy ty</td>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Set of instantiation variables</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC778" 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="LC801" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Bool</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EValArg</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">'Tcp</span>Rn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Delta</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Ghc</span>Rn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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780
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</span><span class="p">)</span></span>
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803
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781
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Special behaviour only for (f e1 .. en)</span></span>
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804
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Even narrower than tcInferAppHead! But plenty for now.</span></span>
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805
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782
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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806
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783
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The returned Delta is a superset of the one passed in</span></span>
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807
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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;">-- with added instantiation variables from</span></span>
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808
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785
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) the call itself</span></span>
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809
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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;">-- (b) the arguments of the call</span></span>
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<pre style="margin: 0;">-<span id="LC810" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg</span> <span class="n" style="color: #333;">impred_on</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">larg</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg</span><span class="p">))</span> <span class="n" style="color: #333;">arg_ty</span></span>
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811
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<pre style="margin: 0;">-<span id="LC811" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">impred_on</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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812
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788
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">delta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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813
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<pre style="margin: 0;">-<span id="LC813" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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814
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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="n" style="color: #333;">otherwise</span></span>
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789
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<pre style="margin: 0;">+<span id="LC789" 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;">go</span> <span class="n" style="color: #333;">arg_ty</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="n" style="color: #333;">no_ql_result</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ValArg</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">guarded</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGuardedTy</span> <span class="n" style="color: #333;">arg_ty</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: guardedness is computed based on the original,</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unzonked arg_ty, so we deliberately do not exploit</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- guardedness that emerges a result of QL on earlier args</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"></span>
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797
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">arg_ty</span><span class="p">)</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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799
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"></span>
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800
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<pre style="margin: 0;">+<span id="LC800" 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;">kappa</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">arg_ty</span></span>
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801
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">kappa</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">delta</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" 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;">info</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readMetaTyVar</span> <span class="n" style="color: #333;">kappa</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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">arg_ty'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">arg_ty'</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;">Flexi</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">quickLookArg1</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</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="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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807
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">quickLookArg1</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">arg_ty</span></span>
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808
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"><span class="n" style="color: #333;">isGuardedTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</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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810
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"><span class="n" style="color: #333;">isGuardedTy</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="811" 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">
811
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<pre style="margin: 0;">+<span id="LC811" 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;">tc</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;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGenerativeTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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<td class="diff-line-num new new_line" data-linenumber="812" 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">
812
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<pre style="margin: 0;">+<span id="LC812" 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="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitAppTy_maybe</span> <span class="n" style="color: #333;">ty</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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813
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<pre style="margin: 0;">+<span id="LC813" 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="kt" style="color: #458; font-weight: 600;">False</span></span>
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814
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"></span>
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815
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Delta</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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816
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Delta</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EValArg</span> <span class="kt" style="color: #458; font-weight: 600;">'TcpInst</span><span class="p">)</span></span>
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817
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"><span class="n" style="color: #333;">quickLookArg1</span> <span class="n" style="color: #333;">guarded</span> <span class="n" style="color: #333;">delta</span> <span class="n" style="color: #333;">larg</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="n" style="color: #333;">arg_ty</span></span>
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815
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818
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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816
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819
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">rn_fun</span><span class="p">,</span><span class="n" style="color: #333;">rn_args</span><span class="p">,</span><span class="n" style="color: #333;">rebuild</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitHsApps</span> <span class="n" style="color: #333;">arg</span></span>
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817
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820
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_fun_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferAppHead_maybe</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">rn_args</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="825" 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="828" 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">@@ -825,7 +828,7 @@ quickLookArg impred_on guarded delta (ValArg larg@(L loc arg)) arg_ty</td>
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825
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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;">return</span> <span class="n" style="color: #333;">no_ql_result</span> <span class="p">;</span></span>
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826
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<td class="diff-line-num new_line" data-linenumber="829" 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">
829
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">fun'</span><span class="p">,</span> <span class="n" style="color: #333;">fun_sigma</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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827
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830
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">no_free_kappas</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rn_args'</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">addGuardFlags</span></span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">no_free_kappas</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">findNoKappa</span></span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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829
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"quickLookArg 2"</span> <span class="o" style="font-weight: 600;">$</span></span>
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830
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"no_free_kappas:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">no_free_kappas</span></span>
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831
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"guarded:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">guarded</span> <span class="p">]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="833" 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="836" 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">@@ -833,7 +836,7 @@ quickLookArg impred_on guarded delta (ValArg larg@(L loc arg)) arg_ty</td>
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833
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">no_ql_result</span></span>
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834
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<td class="diff-line-num new_line" data-linenumber="837" 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">
837
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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835
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">delta_app</span><span class="p">,</span> <span class="n" style="color: #333;">inst_args</span><span class="p">,</span> <span class="n" style="color: #333;">app_res_rho</span><span class="p">)</span></span>
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836
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<td class="diff-line-num new_line old" data-linenumber="839" 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="LC836" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args<span class="idiff left right">'</span></span></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstFun</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rn_fun</span> <span class="n" style="color: #333;">fun_sigma</span> <span class="n" style="color: #333;">rn_args</span></span>
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837
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"quickLookArg"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"arg:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arg</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"delta:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">delta</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/eae80258c718ee303910818acf715e78a98a7f59...78b4c82c30d28e3eb11d05beaee1a03267661482#fa8150a02afc8d7030a5c769256631c5d43f9d76"><strong>testsuite/tests/impredicative/all.T</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">@@ -10,7 +10,8 @@ test('Church1', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">boxy</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Compose</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T2193</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">icfp20-ok</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">icfp20-fail</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18126-1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18126-nasty</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">icfp20-ok</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">icfp20-fail</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18126-1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18126-nasty</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">cabal-example</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/eae80258c718ee303910818acf715e78a98a7f59...78b4c82c30d28e3eb11d05beaee1a03267661482#dda4af529963f160694dec14ec3e0135fec001f4"><strong>testsuite/tests/impredicative/cabal-example.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- This example illustrates a nasty case of "vacuous" abstraction</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It comes from Cabal library Distribution.Simple.Utils</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type HCS = (?callStack :: CallStack)</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wcs :: forall a. (HCS => a) -> a</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: Int</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ($) :: forall p q. (p->q) -> p -> q</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The call: wcs $ foo</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">From QL on the first arg of $ we instantiate wcs with a:=kappa. Then</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can work out what p and q must instantiate to. (the (p->q) arg of</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">($) is guarded): get p := (HCS => kappa), q := kappa</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But alas, the second arg of $, namely foo, satisfies our</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fiv(rho_r)=empty condition. (Here rho_r is Int.) So we try to mgu(</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HCS => kappa, Int ), and fail.</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The basic problem is this: we said in 5.4 of the Quick Look paper we</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">didn’t about vacuous type abstraction, but we clearly do care about</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type-class abstraction.</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How does this work in GHC today, with the built-in rule? It works</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because we are order-dependent: we look at the first argument first.</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The same would work here. If we applied the QL substitution as we go,</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by the time we got to the second argument, the expected type would</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">look like (HCS => kappa), and we would abandon QL on it (App-lightning</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only applies to rho). But the price is order-dependence.</span></span>
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<pre style="margin: 0;">+<span id="LC32" 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="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">CabalEx</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack</span><span class="p">(</span> <span class="n" style="color: #333;">withFrozenCallStack</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- withFrozenCallStack :: HasCallStack</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- => ( HasCallStack => a )</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -> a</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="n" style="color: #333;">printRawCommandAndArgsAndEnv</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="n" style="color: #333;">printRawCommandAndArgsAndEnv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"urk"</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="n" style="color: #333;">printRawCommandAndArgs</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;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="n" style="color: #333;">printRawCommandAndArgs</span> <span class="n" style="color: #333;">verbosity</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">withFrozenCallStack</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">printRawCommandAndArgsAndEnv</span> <span class="n" style="color: #333;">verbosity</span></span></pre>
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