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<h3>
Simon Peyton Jones pushed to branch wip/T17173
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/314e8459370714fbf94d294a8701f0e7866fad53">314e8459</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-15T08:50:58+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Final wibbles
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<a href="#8dec347fbe40358b852d7b50ace1e4d62b9b6660">
compiler/GHC/Tc/Gen/Expr.hs-boot
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<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<h4>Changes:</h4>
<li id="902811828741e6bcd64702935bbb54edbbd070ef">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/314e8459370714fbf94d294a8701f0e7866fad53#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/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">@@ -131,12 +131,12 @@ tc_poly_expr_nc (L loc expr) res_ty</td>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</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;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------</span></span>
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TcSigmaType</span></span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">LHsExpr</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">GhcTc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcSigmaType</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used by tcRnExpr to implement GHCi :type</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">le</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">expr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addExprCtxt</span> <span class="n" style="color: #333;">le</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferApp</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;"><span class="idiff left right">ty</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC138" 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;"><span class="idiff left">fun</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">args</span></span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferApp</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">wrapHsArgs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">args</span></span><span class="p"><span class="idiff">),</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRho</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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 class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<li id="8dec347fbe40358b852d7b50ace1e4d62b9b6660">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/314e8459370714fbf94d294a8701f0e7866fad53#8dec347fbe40358b852d7b50ace1e4d62b9b6660"><strong>compiler/GHC/Tc/Gen/Expr.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">@@ -15,6 +15,8 @@ tcExpr :: HsExpr GhcRn -> ExpRhoType -> TcM (HsExpr GhcTcId)</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferRho</span><span class="p">,</span> <span class="n" style="color: #333;">tcInferRhoNC</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">tcInferSigma</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">GhcTcId</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">tcSyntaxOp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SyntaxExprRn</span></span>
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<pre style="margin: 0;"> <span id="LC22" 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;">SyntaxOpType</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ shape of syntax operator arguments</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/314e8459370714fbf94d294a8701f0e7866fad53#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.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">@@ -28,7 +28,7 @@ where</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcPrelude</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Gen</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span> <span class="n" style="color: #333;">tcSyntaxOp</span><span class="p">,</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span><span class="p">,</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Rho</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Gen</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span> <span class="n" style="color: #333;">tcSyntaxOp</span><span class="p">,</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span><span class="p">,</span> <span class="n" style="color: #333;">tcInfer<span class="idiff left right">Sigma</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</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">@@ -409,7 +409,9 @@ tc_pat penv (ViewPat _ expr pat) overall_pat_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- An exotic example:</span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pair :: forall a. a -> forall b. b -> (a,b)</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f (pair True -> x) = ...here (x :: forall b. b -> (Bool,b))</span></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span><span class="n" style="color: #333;">expr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRho</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TEMPORARY: pending simple subsumption, use tcInferSigma</span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">expr'</span><span class="p">,</span><span class="n" style="color: #333;">expr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">expr</span></span>
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415
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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Expression must be a function</span></span>
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417
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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">expr_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">expr</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/314e8459370714fbf94d294a8701f0e7866fad53#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.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">@@ -2489,7 +2489,7 @@ tcRnExpr hsc_env mode rdr_expr</td>
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<pre style="margin: 0;"> <span id="LC2489" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it might have a rank-2 type (e.g. :t runST)</span></span>
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span> <span class="p">;</span></span>
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2491
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">{</span> <span class="n" style="color: #333;">fresh_it</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">itName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">rdr_expr</span><span class="p">)</span> <span class="p">}</span> <span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC2492" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">res_ty</span></span><span class="p">),</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2492" class="line" lang="haskell"> <span class="p">((</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">_tc_expr</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res_ty</span></span><span class="p"><span class="idiff right">)</span>),</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">captureTopConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2494" class="line" lang="haskell"> <span class="n" style="color: #333;">pushTcLevelM</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2495" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_infer</span> <span class="n" style="color: #333;">rn_expr</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">@@ -2518,8 +2518,7 @@ tcRnExpr hsc_env mode rdr_expr</td>
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2518
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="p">(</span><span class="n" style="color: #333;">normaliseType</span> <span class="n" style="color: #333;">fam_envs</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="p">}</span></span>
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2520
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2521
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_infer</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">inst</span> <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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRho</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2521" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_infer</span> <span class="n" style="color: #333;">expr</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInferRho</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC2522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInferSigma</span> <span class="n" style="color: #333;">expr</span></span>
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcRnExprMode]</span></span>
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