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<h3>
Simon Peyton Jones pushed to branch wip/T18323
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/888a920ac84dc57c327abe468b336bea3065c801">888a920a</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-07-28T10:55:25+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add right-to-left rule for pattern bindings
Fix #18323 by adding a few lines of code to handle non-recursive
pattern bindings.
See Note [Special case for non-recursive pattern bindings]
in GHC.Tc.Gen.Bind
Alas, this confused the pattern-match overlap checker; see #18323.
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<h4>7 changed files:</h4>
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<li class="file-stats">
<a href="#65ca06d51797ebf672a62bde6c00bcb9444e1425">
compiler/GHC/Hs/Binds.hs
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<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.hs
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<li class="file-stats">
<a href="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">
compiler/GHC/Tc/Gen/Match.hs
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<a href="#b28f2a9a42f420338f6ed7df6d45db22d24f195b">
compiler/GHC/Tc/Gen/Match.hs-boot
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<li class="file-stats">
<a href="#6a120b0673f8920127d8fffdaa16f01b90cc92d7">
compiler/GHC/Tc/Utils/Zonk.hs
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<h4>Changes:</h4>
<li id="65ca06d51797ebf672a62bde6c00bcb9444e1425">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#65ca06d51797ebf672a62bde6c00bcb9444e1425"><strong>compiler/GHC/Hs/Binds.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -315,18 +315,13 @@ data HsBindLR idL idR</td>
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<pre style="margin: 0;"> <span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">XHsBindsLR</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XXHsBindsLR</span> <span class="n" style="color: #333;">idL</span> <span class="n" style="color: #333;">idR</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">NPatBindTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NPatBindTc</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_fvs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Free variables</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_rhs_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type of the GRHSs</span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"> <span class="p">}</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span></span>
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<pre style="margin: 0;">-<span id="LC322" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XFunBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pL</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XFunBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pL</span><span class="p">)</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;">NameSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Free variables</span></span>
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XFunBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pL</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="c1" style="color: #998; font-style: italic;">-- See comments on FunBind.fun_ext</span></span>
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NameSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Free variables</span></span>
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NPatBindTc</span></span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XPatBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Type</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Type of the GRHSs</span></span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XVarBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pL</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">XAbsBinds</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pL</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">pR</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtField</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -181,7 +181,7 @@ dsHsBind dflags b@(FunBind { fun_id = L loc fun</td>
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181
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">force_var</span><span class="p">,</span> <span class="p">[</span><span class="n" style="color: #333;">core_binds</span><span class="p">])</span> <span class="p">}</span></span>
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182
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsBind</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span></span>
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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NPatBindTc</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ticks</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_tick</span><span class="p">,</span> <span class="n" style="color: #333;">var_ticks</span><span class="p">)</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC186" 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;">rhss_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGuardMatches</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">body_expr</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsGuarded</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">ty</span> <span class="p">(</span><span class="n" style="color: #333;">nonEmpty</span> <span class="n" style="color: #333;">rhss_deltas</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -213,7 +213,7 @@ dsUnliftedBind (FunBind { fun_id = L l fun</td>
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">bindNonRec</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"><span class="n" style="color: #333;">dsUnliftedBind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span><span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NPatBindTc</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span> <span class="p">})</span> <span class="n" style="color: #333;">body</span></span>
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- let C x# y# = rhs in body</span></span>
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218
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ==> case rhs of C x# y# -> body</span></span>
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219
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219
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rhs_deltas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkGuardMatches</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindGuards</span> <span class="n" style="color: #333;">grhss</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#83f745d921da7adb739e81f83e1c07e723e4a789"><strong>compiler/GHC/Tc/Gen/Bind.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1273,20 +1273,15 @@ tcMonoBinds :: RecFlag -- Whether the binding is recursive for typechecking pur</td>
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1273
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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigFun</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LetBndrSpec</span></span>
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1274
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1274
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<pre style="margin: 0;"> <span id="LC1274" 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;">LHsBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span></span>
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1275
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1275
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<pre style="margin: 0;"> <span id="LC1275" 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;">LHsBinds</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">MonoBindInfo</span><span class="p">])</span></span>
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1276
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<pre style="margin: 0;">+<span id="LC1276" class="line" lang="haskell"></span>
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1277
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<pre style="margin: 0;">+<span id="LC1277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SPECIAL CASE 1: see Note [Inference for non-recursive function bindings]</span></span>
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1276
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"><span class="n" style="color: #333;">tcMonoBinds</span> <span class="n" style="color: #333;">is_rec</span> <span class="n" style="color: #333;">sig_fn</span> <span class="n" style="color: #333;">no_gen</span></span>
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1277
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1279
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">b_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunBind</span> <span class="p">{</span> <span class="n" style="color: #333;">fun_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">nm_loc</span> <span class="n" style="color: #333;">name</span></span>
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1278
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1280
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<pre style="margin: 0;"> <span id="LC1280" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fun_matches</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matches</span> <span class="p">})]</span></span>
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1279
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1281
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<pre style="margin: 0;"> <span id="LC1281" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Single function binding,</span></span>
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1280
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">is_rec</span> <span class="c1" style="color: #998; font-style: italic;">-- ...binder isn't mentioned in RHS</span></span>
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1281
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sig_fn</span> <span class="n" style="color: #333;">name</span> <span class="c1" style="color: #998; font-style: italic;">-- ...with no type signature</span></span>
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1282
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<pre style="margin: 0;">-<span id="LC1282" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Single function non-recursive binding special-case]</span></span>
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1283
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In this very special case we infer the type of the</span></span>
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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- right hand side first (it may have a higher-rank type)</span></span>
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1286
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<pre style="margin: 0;">-<span id="LC1286" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and *then* make the monomorphic Id for the LHS</span></span>
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1287
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<pre style="margin: 0;">-<span id="LC1287" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. f = \(x::forall a. a->a) -> <body></span></span>
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1288
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<pre style="margin: 0;">-<span id="LC1288" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We want to infer a higher-rank type for f</span></span>
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1289
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<pre style="margin: 0;">-<span id="LC1289" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">b_loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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1284
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<pre style="margin: 0;">+<span id="LC1284" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">b_loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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1290
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1285
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<pre style="margin: 0;"> <span id="LC1285" 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;">co_fn</span><span class="p">,</span> <span class="n" style="color: #333;">matches'</span><span class="p">),</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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1291
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1286
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<pre style="margin: 0;"> <span id="LC1286" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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1292
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendBinderStack</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcIdBndr_ExpType</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">exp_ty</span> <span class="kt" style="color: #458; font-weight: 600;">NotTopLevel</span><span class="p">]</span> <span class="o" style="font-weight: 600;">$</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">@@ -1304,6 +1299,29 @@ tcMonoBinds is_rec sig_fn no_gen</td>
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1304
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1299
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<pre style="margin: 0;"> <span id="LC1299" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1305
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1300
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<pre style="margin: 0;"> <span id="LC1300" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_mono_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mono_id</span> <span class="p">}])</span> <span class="p">}</span></span>
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1306
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1301
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<pre style="margin: 0;"> <span id="LC1301" class="line" lang="haskell"></span>
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1302
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<pre style="margin: 0;">+<span id="LC1302" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SPECIAL CASE 2: see Note [Inference for non-recursive pattern bindings]</span></span>
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1303
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<pre style="margin: 0;">+<span id="LC1303" class="line" lang="haskell"><span class="n" style="color: #333;">tcMonoBinds</span> <span class="n" style="color: #333;">is_rec</span> <span class="n" style="color: #333;">sig_fn</span> <span class="n" style="color: #333;">no_gen</span></span>
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1304
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<pre style="margin: 0;">+<span id="LC1304" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">b_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span> <span class="p">})]</span></span>
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1305
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<pre style="margin: 0;">+<span id="LC1305" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NonRecursive</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">is_rec</span> <span class="c1" style="color: #998; font-style: italic;">-- ...binder isn't mentioned in RHS</span></span>
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1306
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<pre style="margin: 0;">+<span id="LC1306" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="n" style="color: #333;">isNothing</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">sig_fn</span><span class="p">)</span> <span class="n" style="color: #333;">bndrs</span></span>
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1307
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<pre style="margin: 0;">+<span id="LC1307" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">patMonoBindsCtxt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1308
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<pre style="margin: 0;">+<span id="LC1308" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">grhss'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInfer</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">exp_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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1309
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<pre style="margin: 0;">+<span id="LC1309" class="line" lang="haskell"> <span class="n" style="color: #333;">tcGRHSsPat</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">exp_ty</span></span>
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1310
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<pre style="margin: 0;">+<span id="LC1310" class="line" lang="haskell"></span>
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1311
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<pre style="margin: 0;">+<span id="LC1311" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">exp_pat_ty</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span></span>
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1312
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<pre style="margin: 0;">+<span id="LC1312" class="line" lang="haskell"> <span class="n" style="color: #333;">exp_pat_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unrestricted</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>
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1313
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<pre style="margin: 0;">+<span id="LC1313" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">mbis</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLetPat</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="n" style="color: #333;">no_gen</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">exp_pat_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1314" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">lookupMBI</span> <span class="n" style="color: #333;">bndrs</span></span>
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1315
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<pre style="margin: 0;">+<span id="LC1315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1316" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">unitBag</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">b_loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1317" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss'</span></span>
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1318
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<pre style="margin: 0;">+<span id="LC1318" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ticks</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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1319
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<pre style="margin: 0;">+<span id="LC1319" class="line" lang="haskell"></span>
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1320
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<pre style="margin: 0;">+<span id="LC1320" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbis</span> <span class="p">)</span> <span class="p">}</span></span>
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1321
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<pre style="margin: 0;">+<span id="LC1321" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1322
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<pre style="margin: 0;">+<span id="LC1322" class="line" lang="haskell"> <span class="n" style="color: #333;">bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collectPatBinders</span> <span class="n" style="color: #333;">pat</span></span>
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1323
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1324" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GENERAL CASE</span></span>
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"><span class="n" style="color: #333;">tcMonoBinds</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">sig_fn</span> <span class="n" style="color: #333;">no_gen</span> <span class="n" style="color: #333;">binds</span></span>
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<pre style="margin: 0;"> <span id="LC1326" 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;">tc_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM</span> <span class="p">(</span><span class="n" style="color: #333;">tcLhs</span> <span class="n" style="color: #333;">sig_fn</span> <span class="n" style="color: #333;">no_gen</span><span class="p">))</span> <span class="n" style="color: #333;">binds</span></span>
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1309
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1327
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<pre style="margin: 0;"> <span id="LC1327" 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">@@ -1326,6 +1344,66 @@ tcMonoBinds _ sig_fn no_gen binds</td>
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1344
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">binds'</span><span class="p">,</span> <span class="n" style="color: #333;">mono_infos</span><span class="p">)</span> <span class="p">}</span></span>
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1328
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1346
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Special case for non-recursive function bindings]</span></span>
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1348
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1349
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the special case of</span></span>
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1350
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<pre style="margin: 0;">+<span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A non-recursive FunBind</span></span>
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1351
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<pre style="margin: 0;">+<span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* With no type signature</span></span>
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1352
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<pre style="margin: 0;">+<span id="LC1352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we infer the type of the right hand side first (it may have a</span></span>
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1353
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">higher-rank type) and *then* make the monomorphic Id for the LHS e.g.</span></span>
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1354
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = \(x::forall a. a->a) -> <body></span></span>
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1355
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"></span>
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1356
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<pre style="margin: 0;">+<span id="LC1356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to infer a higher-rank type for f</span></span>
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1357
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<pre style="margin: 0;">+<span id="LC1357" class="line" lang="haskell"></span>
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1358
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<pre style="margin: 0;">+<span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Special case for non-recursive pattern bindings]</span></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the special case of</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A pattern binding</span></span>
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1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* With no type signature for any of the binders</span></span>
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1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can /infer/ the type of the RHS, and /check/ the pattern</span></span>
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1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">against that type. For example (#18323)</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"></span>
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1366
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ids :: [forall a. a -> a]</span></span>
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1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> combine :: (forall a . [a] -> a) -> [forall a. a -> a]</span></span>
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1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> ((forall a . [a] -> a), [forall a. a -> a])</span></span>
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1369
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"></span>
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1370
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (x,y) = combine head ids</span></span>
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1371
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with -XImpredicativeTypes we can infer a good type for</span></span>
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1373
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(combine head ids), and use that to tell us the polymorphic</span></span>
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1374
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types of x and y.</span></span>
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1375
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't need to check -XImpredicativeTypes beucase without it</span></span>
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1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">these types like [forall a. a->a] are illegal anyway, so this</span></span>
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1378
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<pre style="margin: 0;">+<span id="LC1378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">special case code only really has an effect if -XImpredicativeTypes</span></span>
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1379
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is on. Small exception:</span></span>
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1380
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (x) = e</span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is currently treated as a pattern binding so, even absent</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-XImpredicativeTypes, we will get a small improvement in behaviour.</span></span>
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1383
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<pre style="margin: 0;">+<span id="LC1383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But I don't think it's worth an extension flag.</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"></span>
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1385
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<pre style="margin: 0;">+<span id="LC1385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why do we require no type signatures on /any/ of the binders?</span></span>
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1386
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<pre style="margin: 0;">+<span id="LC1386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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1387
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<pre style="margin: 0;">+<span id="LC1387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x :: forall a. a->a</span></span>
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1388
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> y :: forall a. a->a</span></span>
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1389
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<pre style="margin: 0;">+<span id="LC1389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (x,y) = (id,id)</span></span>
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1390
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<pre style="margin: 0;">+<span id="LC1390" class="line" lang="haskell"></span>
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1391
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<pre style="margin: 0;">+<span id="LC1391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we should /check/ the RHS with expected type</span></span>
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1392
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (forall a. a->a, forall a. a->a).</span></span>
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1393
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<pre style="margin: 0;">+<span id="LC1393" class="line" lang="haskell"></span>
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1394
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<pre style="margin: 0;">+<span id="LC1394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we have no signatures, we can the approach of this Note</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1395" 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">
1395
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to /infer/ the type of the RHS.</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But what if we have some signatures, but not all? Say this:</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> p :: forall a. a->a</span></span>
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1399
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<pre style="margin: 0;">+<span id="LC1399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (p,q) = (id, (\(x::forall b. b->b). x True))</span></span>
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1400
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<pre style="margin: 0;">+<span id="LC1400" class="line" lang="haskell"></span>
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1401
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we want to push p's signature inwards, i.e. /checking/, to</span></span>
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1402
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">correctly elaborate 'id'. But we want to /infer/ q's higher rank</span></span>
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1403
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type. There seems to be no way to do this. So currently we only</span></span>
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1404
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">switch to inference when we have no signature for any of the binders.</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1406
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"></span>
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1329
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"></span>
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1330
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------------</span></span>
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1331
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1409
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcLhs typechecks the LHS of the bindings, to construct the environment in which</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1393" 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="1471" 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">@@ -1393,7 +1471,7 @@ tcLhs sig_fn no_gen (PatBind { pat_lhs = pat, pat_rhs = grhss })</td>
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1393
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1471
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<pre style="margin: 0;"> <span id="LC1471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The above inferred type get an unrestricted multiplicity. It may be</span></span>
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1394
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<pre style="margin: 0;"> <span id="LC1472" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- worth it to try and find a finer-grained multiplicity here</span></span>
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1395
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1473
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<pre style="margin: 0;"> <span id="LC1473" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if examples warrant it.</span></span>
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1396
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<pre style="margin: 0;">-<span id="LC1396" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">lookup<span class="idiff left right">_info</span></span> <span class="n" style="color: #333;">nosig_names</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">lookup<span class="idiff left right">MBI</span></span> <span class="n" style="color: #333;">nosig_names</span></span>
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1397
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1475
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<pre style="margin: 0;"> <span id="LC1475" class="line" lang="haskell"></span>
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1398
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1476
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<pre style="margin: 0;"> <span id="LC1476" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mbis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_mbis</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">nosig_mbis</span></span>
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1399
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1477
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<pre style="margin: 0;"> <span id="LC1477" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1411" 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="1489" 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">@@ -1411,19 +1489,19 @@ tcLhs sig_fn no_gen (PatBind { pat_lhs = pat, pat_rhs = grhss })</td>
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1411
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1489
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<pre style="margin: 0;"> <span id="LC1489" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcIdSig</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">)</span></span>
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1412
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">name</span></span>
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1413
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- After typechecking the pattern, look up the binder</span></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- names that lack a signature, which the pattern has brought</span></span>
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1416
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- into scope.</span></span>
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1417
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">MonoBindInfo</span></span>
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1418
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_info</span> <span class="n" style="color: #333;">name</span></span>
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1419
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<pre style="margin: 0;">-<span id="LC1419" 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;">mono_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">name</span></span>
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1420
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MBI</span> <span class="p">{</span> <span class="n" style="color: #333;">mbi_poly_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1421" 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">
1421
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<td class="diff-line-num new_line old" data-linenumber="1492" 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="LC1421" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_mono_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mono_id</span> <span class="p">})</span> <span class="p">}</span></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"></span>
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1424
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1492
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<pre style="margin: 0;"> <span id="LC1492" class="line" lang="haskell"><span class="n" style="color: #333;">tcLhs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">other_bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"tcLhs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other_bind</span><span class="p">)</span></span>
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1425
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1493
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<pre style="margin: 0;"> <span id="LC1493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- AbsBind, VarBind impossible</span></span>
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1426
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1494
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="haskell"></span>
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1495
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<pre style="margin: 0;">+<span id="LC1495" class="line" lang="haskell"><span class="n" style="color: #333;">lookupMBI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">MonoBindInfo</span></span>
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1496
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<pre style="margin: 0;">+<span id="LC1496" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- After typechecking the pattern, look up the binder</span></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- names that lack a signature, which the pattern has brought</span></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- into scope.</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"><span class="n" style="color: #333;">lookupMBI</span> <span class="n" style="color: #333;">name</span></span>
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1500
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<pre style="margin: 0;">+<span id="LC1500" 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;">mono_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">name</span></span>
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1501
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MBI</span> <span class="p">{</span> <span class="n" style="color: #333;">mbi_poly_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1502" 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">
1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1503
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<pre style="margin: 0;">+<span id="LC1503" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mbi_mono_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mono_id</span> <span class="p">})</span> <span class="p">}</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"></span>
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1505
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------</span></span>
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1506
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"><span class="n" style="color: #333;">tcLhsSigId</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LetBndrSpec</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdSigInfo</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">MonoBindInfo</span></span>
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"><span class="n" style="color: #333;">tcLhsSigId</span> <span class="n" style="color: #333;">no_gen</span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">sig</span><span class="p">)</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">@@ -1466,15 +1544,9 @@ tcRhs (TcPatBind infos pat' grhss pat_ty)</td>
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendIdBinderStackForRhs</span> <span class="n" style="color: #333;">infos</span> <span class="o" style="font-weight: 600;">$</span></span>
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1467
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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcRhs: pat bind"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat'</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>
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1546
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<pre style="margin: 0;"> <span id="LC1546" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">grhss'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">patMonoBindsCtxt</span> <span class="n" style="color: #333;">pat'</span> <span class="n" style="color: #333;">grhss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1469" class="line" lang="haskell"> <span class="n" style="color: #333;">tcScalingUsage</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="o" style="font-weight: 600;">$</span></span>
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1470
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<pre style="margin: 0;">-<span id="LC1470" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Like in tcMatchesFun, this scaling happens because all</span></span>
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1471
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<pre style="margin: 0;">-<span id="LC1471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let bindings are unrestricted. A difference, here, is</span></span>
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that when this is not the case, any more, we will have to</span></span>
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1473
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<pre style="margin: 0;">-<span id="LC1473" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- make sure that the pattern is strict, otherwise this will</span></span>
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<pre style="margin: 0;">-<span id="LC1474" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- be desugar to incorrect code.</span></span>
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"> <span class="n" style="color: #333;">tcGRHSsPat</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">pat_ty</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">tcGRHSsPat</span> <span class="n" style="color: #333;">grhss</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss'</span></span>
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NPatBindTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">emptyNameSet</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pat_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ticks</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span> <span class="p">)}</span></span>
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<pre style="margin: 0;"> <span id="LC1552" class="line" lang="haskell"><span class="n" style="color: #333;">tcExtendTyVarEnvForRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcIdSigInst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -156,10 +156,17 @@ tcMatchLambda herald match_ctxt match res_ty</td>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @tcGRHSsPat@ typechecks @[GRHSs]@ that occur in a @PatMonoBind@.</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">tcGRHSsPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</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="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Tc</span>RhoType</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">tcGRHSsPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</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="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Exp</span>RhoType</span></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;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for pattern bindings</span></span>
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">tcGRHSsPat</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcGRHSs</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">tcGRHSsPat</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcScalingUsage</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Like in tcMatchesFun, this scaling happens because all</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let bindings are unrestricted. A difference, here, is</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that when this is not the case, any more, we will have to</span></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- make sure that the pattern is strict, otherwise this will</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- desugar to incorrect code.</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">tcGRHSs</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="n" style="color: #333;">grhss</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"> <span class="n" style="color: #333;">match_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcBody</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#b28f2a9a42f420338f6ed7df6d45db22d24f195b"><strong>compiler/GHC/Tc/Gen/Match.hs-boot</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">@@ -2,13 +2,13 @@ module GHC.Tc.Gen.Match where</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MatchGroup</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Tc</span>RhoType</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Exp</span>RhoType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Extension</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">tcGRHSsPat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</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="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Tc</span>RhoType</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Exp</span>RhoType</span></span>
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<pre style="margin: 0;"> <span id="LC12" 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;">GRHSs</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">tcMatchesFun</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/888a920ac84dc57c327abe468b336bea3065c801#6a120b0673f8920127d8fffdaa16f01b90cc92d7"><strong>compiler/GHC/Tc/Utils/Zonk.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -532,12 +532,12 @@ zonk_lbind env = wrapLocM (zonk_bind env)</td>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"><span class="n" style="color: #333;">zonk_bind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ZonkEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">HsBind</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC534" class="line" lang="haskell"><span class="n" style="color: #333;">zonk_bind</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">bind</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatBind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NPatBindTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fvs</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty</span><span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span><span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC536" 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;">_env</span><span class="p">,</span> <span class="n" style="color: #333;">new_pat</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkPat</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pat</span> <span class="c1" style="color: #998; font-style: italic;">-- Env already extended</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_grhss</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkGRHSs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">zonkLExpr</span> <span class="n" style="color: #333;">grhss</span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcTypeToTypeX</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">bind</span> <span class="p">{</span> <span class="n" style="color: #333;">pat_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_pat</span><span class="p">,</span> <span class="n" style="color: #333;">pat_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_grhss</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NPatBindTc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fvs</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">new_ty</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_ty</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">zonk_bind</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarBind</span> <span class="p">{</span> <span class="n" style="color: #333;">var_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">var_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">var</span><span class="p">,</span> <span class="n" style="color: #333;">var_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expr</span> <span class="p">})</span></span>
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