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<h3>
Simon Peyton Jones pushed to branch wip/T17775
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/a4249525036262c9ecf52cbcdd9ad70304c53d57">a4249525</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T02:06:53+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
esp to tcPolyCheck
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<h4>5 changed files:</h4>
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<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.hs
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compiler/GHC/Tc/Gen/Expr.hs
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<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="83f745d921da7adb739e81f83e1c07e723e4a789">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4249525036262c9ecf52cbcdd9ad70304c53d57#83f745d921da7adb739e81f83e1c07e723e4a789"><strong>compiler/GHC/Tc/Gen/Bind.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="697" 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">@@ -697,7 +697,7 @@ tcPolyCheck prag_fn</td>
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697
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697
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mono_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newNameAt</span> <span class="p">(</span><span class="n" style="color: #333;">nameOccName</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">nm_loc</span></span>
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698
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_gen</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">matches'</span><span class="p">))</span></span>
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699
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699
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<pre style="margin: 0;"> <span id="LC699" 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;">sig_loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Sets the binding location for the skolems</span></span>
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700
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSkolemise</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">poly_id</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSkolemise<span class="idiff left">Scoped</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">poly_id</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">\</span></span><span class="n" style="color: #333;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Unwraps multiple layers; e.g</span></span>
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702
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f :: forall a. Eq a => forall b. Ord b => blah</span></span>
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703
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: tcSkolemise makes fresh type variables</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4249525036262c9ecf52cbcdd9ad70304c53d57#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">@@ -1574,7 +1574,7 @@ tcSynArgE :: CtOrigin</td>
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1574
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<pre style="margin: 0;"> <span id="LC1574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ returns a wrapper :: (type of right shape) "->" (type passed in)</span></span>
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1575
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<pre style="margin: 0;"> <span id="LC1575" class="line" lang="haskell"><span class="n" style="color: #333;">tcSynArgE</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">sigma_ty</span> <span class="n" style="color: #333;">syn_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1576
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<pre style="margin: 0;"> <span id="LC1576" 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;">skol_wrap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">ty_wrapper</span><span class="p">))</span></span>
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1577
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<pre style="margin: 0;">-<span id="LC1577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="n" style="color: #333;">sigma_ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="kt" style="color: #458; font-weight: 600;">GenSigCtxt</span> <span class="n" style="color: #333;">sigma_ty</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;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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1578
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rho_ty</span> <span class="n" style="color: #333;">syn_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1579" 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;">result</span><span class="p">,</span> <span class="n" style="color: #333;">skol_wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">ty_wrapper</span><span class="p">)</span> <span class="p">}</span></span>
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1580
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<pre style="margin: 0;"> <span id="LC1580" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -1726,22 +1726,10 @@ in the other order, the extra signature in f2 is reqd.</td>
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1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</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;">TcIdSigInfo</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;">TcType</span><span class="p">)</span></span>
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1727
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1727
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly_id</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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1728
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1728
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<pre style="margin: 0;"> <span id="LC1728" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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1729
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<pre style="margin: 0;">-<span id="LC1729" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="n" style="color: #333;">poly_id</span></span>
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1730
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<pre style="margin: 0;">-<span id="LC1730" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">given</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newEvVars</span> <span class="n" style="color: #333;">theta</span></span>
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1731
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<pre style="margin: 0;">-<span id="LC1731" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcExprSig: CompleteSig"</span> <span class="o" style="font-weight: 600;">$</span></span>
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1732
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<pre style="margin: 0;">-<span id="LC1732" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"poly_id:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">poly_id</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span><span class="p">)</span></span>
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1733
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<pre style="margin: 0;">-<span id="LC1733" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tv_prs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv_prs</span> <span class="p">]</span></span>
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1734
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<pre style="margin: 0;">-<span id="LC1734" class="line" lang="haskell"></span>
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1735
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<pre style="margin: 0;">-<span id="LC1735" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigSkol</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span><span class="p">)</span> <span class="n" style="color: #333;">tv_prs</span></span>
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1736
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span></span>
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1737
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkConstraints</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">given</span> <span class="o" style="font-weight: 600;">$</span></span>
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1738
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<pre style="margin: 0;">-<span id="LC1738" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
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1739
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<pre style="margin: 0;">-<span id="LC1739" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">tau</span></span>
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1740
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<pre style="margin: 0;">-<span id="LC1740" class="line" lang="haskell"></span>
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1741
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">poly_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpTyLams</span> <span class="n" style="color: #333;">skol_tvs</span></span>
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1742
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<pre style="margin: 0;">-<span id="LC1742" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLams</span> <span class="n" style="color: #333;">given</span></span>
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1743
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLet</span> <span class="n" style="color: #333;">ev_binds</span></span>
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1744
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<pre style="margin: 0;">-<span id="LC1744" 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;">mkLHsWrap</span> <span class="n" style="color: #333;">poly_wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">poly_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">poly_id</span></span>
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1730
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">expr'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span> <span class="kt" style="color: #458; font-weight: 600;">ExprSigCtxt</span> <span class="n" style="color: #333;">poly_ty</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;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1731" class="line" lang="haskell"> <span class="n" style="color: #333;">tcCheckMonoExprNC</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">rho_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1732" 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;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap</span> <span class="n" style="color: #333;">expr'</span><span class="p">,</span> <span class="n" style="color: #333;">poly_ty</span><span class="p">)</span> <span class="p">}</span></span>
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1745
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1733
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"><span class="n" style="color: #333;">tcExprSig</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PartialSig</span> <span class="p">{</span> <span class="n" style="color: #333;">psig_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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1735
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Sets the location for the implication constraint</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4249525036262c9ecf52cbcdd9ad70304c53d57#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.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">@@ -777,7 +777,7 @@ tcSpecWrapper :: UserTypeCtxt -> TcType -> TcType -> TcM HsWrapper</td>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Handling SPECIALISE pragmas], wrinkle 1</span></span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="haskell"><span class="n" style="color: #333;">tcSpecWrapper</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">poly_ty</span> <span class="n" style="color: #333;">spec_ty</span></span>
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<pre style="margin: 0;"> <span id="LC779" 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;">sk_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">inst_wrap</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">spec_ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">spec_tau</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">spec_ty</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;">spec_tau</span> <span class="o" style="font-weight: 600;">-></span></span>
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781
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<pre style="margin: 0;"> <span id="LC781" 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;">inst_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">poly_ty</span></span>
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782
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyType</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">spec_tau</span> <span class="n" style="color: #333;">tau</span></span>
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783
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<pre style="margin: 0;"> <span id="LC783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Deliberately ignore the evidence</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4249525036262c9ecf52cbcdd9ad70304c53d57#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.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">@@ -1993,9 +1993,9 @@ isSigmaTy _ = False</td>
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1993
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1993
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<pre style="margin: 0;"> <span id="LC1993" class="line" lang="haskell"></span>
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1994
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1994
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<pre style="margin: 0;"> <span id="LC1994" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True of TcRhoTypes; see Note [TcRhoType]</span></span>
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1995
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1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">ty'</span></span>
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1996
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<pre style="margin: 0;">-<span id="LC1996" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1997
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<pre style="margin: 0;">-<span id="LC1997" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">VisArg</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ft_res</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r</span></span><span class="idiff"> </span><span class="p"><span class="idiff">})</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isRhoTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1998" 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">
1998
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<pre style="margin: 0;">-<span id="LC1998" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1996" 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">
1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1997
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<pre style="margin: 0;">+<span id="LC1997" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">InvisArg</span></span><span class="idiff"> </span><span class="p"><span class="idiff">})</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1998" 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">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1999
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1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"></span>
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2000
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2000
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<pre style="margin: 0;"> <span id="LC2000" class="line" lang="haskell"><span class="cd">-- | Like 'isRhoTy', but also says 'True' for 'Infer' types</span></span>
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2001
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2001
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<pre style="margin: 0;"> <span id="LC2001" class="line" lang="haskell"><span class="n" style="color: #333;">isRhoExpTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4249525036262c9ecf52cbcdd9ad70304c53d57#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -14,7 +14,7 @@</td>
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14
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14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span> <span class="p">(</span></span>
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15
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15
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Full-blown subsumption</span></span>
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16
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultO</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultMono</span><span class="p">,</span></span>
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17
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseET</span><span class="p">,</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise<span class="idiff left">Scoped</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">tcSkolemise</span>ET</span><span class="p">,</span></span>
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18
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSubType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypeSigma</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypePat</span><span class="p">,</span></span>
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19
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkConstraints</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkTvConstraints</span><span class="p">,</span></span>
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20
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20
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">buildImplicationFor</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">buildTvImplication</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitResidualTvConstraint</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">@@ -160,7 +160,7 @@ matchExpectedFunTys herald ctx arity orig_ty thing_inside</td>
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160
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160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_arg_tys</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty</span></span>
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161
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">ty</span></span>
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162
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">theta</span><span class="p">)</span></span>
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163
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_gen</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">-></span></span>
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163
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_gen</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">ty</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;">ty'</span> <span class="o" style="font-weight: 600;">-></span></span>
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164
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">acc_arg_tys</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">ty'</span></span>
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165
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165
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<pre style="margin: 0;"> <span id="LC165" 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;">wrap_gen</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_res</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="p">}</span></span>
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166
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="611" 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="611" 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">@@ -611,7 +611,7 @@ tc_sub_type unify inst_orig ctxt ty_actual ty_expected</td>
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611
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611
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ty_expected ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_expected</span> <span class="p">]</span></span>
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612
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612
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"></span>
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613
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613
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">sk_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">inner_wrap</span><span class="p">)</span></span>
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614
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<pre style="margin: 0;">-<span id="LC614" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty_expected</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">sk_rho</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty_expected</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;">sk_rho</span> <span class="o" style="font-weight: 600;">-></span></span>
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615
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615
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<pre style="margin: 0;"> <span id="LC615" 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;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho_a</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ty_actual</span></span>
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616
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616
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cow</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">rho_a</span> <span class="n" style="color: #333;">sk_rho</span></span>
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617
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617
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<pre style="margin: 0;"> <span id="LC617" 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;">mkWpCastN</span> <span class="n" style="color: #333;">cow</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="937" 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">@@ -937,49 +937,53 @@ the thinking.</td>
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937
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937
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<pre style="margin: 0;"> <span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC939" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"><span class="cd">-- | Take an "expected type" and strip off quantifiers to expose the</span></span>
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type underneath, binding the new skolems for the @thing_inside@.</span></span>
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The returned 'HsWrapper' has type @specific_ty -> expected_ty@.</span></span>
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemise</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">-<span id="LC944" 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;">TcTyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ These are only ever used for scoped type variables.</span></span>
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<pre style="margin: 0;">-<span id="LC946" 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;">HsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The expression has type: spec_ty -> expected_ty</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Skolemisation]</span></span>
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcSkolemise takes "expected type" and strip off quantifiers to expose the</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type underneath, binding the new skolems for the 'thing_inside'</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The returned 'HsWrapper' has type (specific_ty -> expected_ty).</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note:</span></span>
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<pre style="margin: 0;">+<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* tcSkolemiseScoped deals specially with just the outer forall,</span></span>
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<pre style="margin: 0;">+<span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because only the outer forall has type variables that scope</span></span>
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> over the body</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemise</span><span class="p">,</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC956" 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;">TcType</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;">result</span><span class="p">)</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" 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;">HsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The wrapper has type: spec_ty ~> expected_ty</span></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemiseScoped</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topSkolemise</span> <span class="n" style="color: #333;">expected_ty</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigSkol</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">tv_prs</span></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkConstraints</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">given</span> <span class="o" style="font-weight: 600;">$</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="n" style="color: #333;">tcExtendNameTyVarEnv</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">$</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">rho_ty</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"></span>
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970
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<pre style="margin: 0;">+<span id="LC970" 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;">wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLet</span> <span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>
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948
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"></span>
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949
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972
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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950
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973
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<pre style="margin: 0;"> <span id="LC973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We expect expected_ty to be a forall-type</span></span>
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951
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974
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<pre style="margin: 0;"> <span id="LC974" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If not, the call is a no-op</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" 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;">traceTc</span> <span class="s" style="color: #d14;">"tcSkolemise"</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span></span>
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953
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">rho'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topSkolemise</span> <span class="n" style="color: #333;">expected_ty</span></span>
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954
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"></span>
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955
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">debugIsOn</span> <span class="o" style="font-weight: 600;">$</span></span>
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957
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcSkolemise"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span></span>
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958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span><span class="p">,</span></span>
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959
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"expected_ty"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">expected_ty</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="960" 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">
960
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"inst tyvars"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="961" 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">
961
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given</span><span class="p">,</span></span>
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962
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<pre style="margin: 0;">-<span id="LC962" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"inst type"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rho'</span> <span class="p">]</span></span>
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963
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<pre style="margin: 0;">-<span id="LC963" class="line" lang="haskell"></span>
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964
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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Generally we must check that the "forall_tvs" haven't been constrained</span></span>
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965
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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The interesting bit here is that we must include the free variables</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the expected_ty. Here's an example:</span></span>
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967
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<pre style="margin: 0;">-<span id="LC967" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- runST (newVar True)</span></span>
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968
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Here, if we don't make a check, we'll get a type (ST s (MutVar s Bool))</span></span>
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969
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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for (newVar True), with s fresh. Then we unify with the runST's arg type</span></span>
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970
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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forall s'. ST s' a. That unifies s' with s, and a with MutVar s Bool.</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So now s' isn't unconstrained because it's linked to a.</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- However [Oct 10] now that the untouchables are a range of</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TcTyVars, all this is handled automatically with no need for</span></span>
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<pre style="margin: 0;">-<span id="LC975" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- extra faffing around</span></span>
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRhoTy</span> <span class="n" style="color: #333;">expected_ty</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" 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;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">expected_ty</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" 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;">idHsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topSkolemise</span> <span class="n" style="color: #333;">expected_ty</span></span>
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976
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left right">tvs'</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;"><span class="idiff left">skol_tvs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span></span>
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978
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982
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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigSkol</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">tv_prs</span></span>
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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC980" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">checkConstraints</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">skol_info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">given</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">tcExtendNameTyVarEnv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv_prs</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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982
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<pre style="margin: 0;">-<span id="LC982" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">thing_inside</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvs'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rho'</span></span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">checkConstraints</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">skol_info</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">skol_tvs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">given</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">thing_inside</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rho_ty</span></span></span>
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987
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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell"></span>
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984
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988
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<pre style="margin: 0;"> <span id="LC988" 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;">wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLet</span> <span class="n" style="color: #333;">ev_binds</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="p">}</span></span>
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985
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989
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<pre style="margin: 0;"> <span id="LC989" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The ev_binds returned by checkConstraints is very</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">@@ -992,7 +996,8 @@ tcSkolemiseET :: UserTypeCtxt -> ExpSigmaType</td>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemiseET</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">et</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="p">{})</span> <span class="n" style="color: #333;">thing_inside</span></span>
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997
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">idHsWrapper</span><span class="p">,</span> <span class="p">)</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">et</span></span>
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998
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<pre style="margin: 0;"> <span id="LC998" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemiseET</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">mkCheckExpType</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSkolemise</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty</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;">rho_ty</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"> <span class="n" style="color: #333;">thing_inside</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span></span>
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"><span class="n" style="color: #333;">checkConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span></span>
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1003
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<pre style="margin: 0;"> <span id="LC1003" 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;">TcTyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Skolems</span></span>
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