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<h3>

Simon Peyton Jones pushed to branch wip/T16762

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

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<h4>

Commits:

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<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9004c100c4ded5fe0894e957b857eed95bb07605">9004c100</a></strong>

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<span>by Simon Peyton Jones</span>

<i>at 2020-09-21T15:45:13+01:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixes from Simon

1. Comments in Hs.Type

2. Fix latent bug in emitFlatConstraints

3. Adopt Ryan's solution in tc_hs_sig_type, but with comments

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<h4>4 changed files:</h4>

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<li class="file-stats">

<a href="#018be522bc4813b147a1525e4f96a7a493207d96">

compiler/GHC/Hs/Type.hs

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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">

compiler/GHC/Tc/Gen/HsType.hs

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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">

compiler/GHC/Tc/Solver.hs

</a>

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<li class="file-stats">

<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">

compiler/GHC/Tc/Types/Constraint.hs

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<h4>Changes:</h4>

<li id="018be522bc4813b147a1525e4f96a7a493207d96">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9004c100c4ded5fe0894e957b857eed95bb07605#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/Type.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">@@ -357,7 +357,7 @@ data HsForAllTelescope pass</td>

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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell">    <span class="p">{</span> <span class="n" style="color: #333;">hsf_xvis</span>      <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">XHsForAllVis</span> <span class="n" style="color: #333;">pass</span></span>

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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell">    <span class="p">,</span> <span class="n" style="color: #333;">hsf_vis_bndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell">    <span class="p">}</span></span>

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<pre style="margin: 0;">-<span id="LC360" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ An invisible @forall@ (e.g., @forall a {b} c<span class="idiff left right"> -></span> {...}@),</span></span>

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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ An invisible @forall@ (e.g., @forall a {b} c<span class="idiff left right">.</span> {...}@),</span></span>

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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">--   where each binder has a 'Specificity'.</span></span>

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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell">    <span class="p">{</span> <span class="n" style="color: #333;">hsf_xinvis</span>       <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">XHsForAllInvis</span> <span class="n" style="color: #333;">pass</span></span>

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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell">    <span class="p">,</span> <span class="n" style="color: #333;">hsf_invis_bndrs</span>  <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">]</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="416" 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">@@ -416,6 +416,17 @@ emptyLHsQTvs = HsQTvs { hsq_ext = [], hsq_explicit = [] }</td>

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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used to quantify the implicit binders of a type</span></span>

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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * Implicit binders of a type signature (LHsSigType/LHsSigWcType)</span></span>

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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * Patterns in a type/data family instance (HsTyPats)</span></span>

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<pre style="margin: 0;">+<span id="LC419" 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="LC420" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We support two forms:</span></span>

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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   HsOuterImplicit (implicit quantification, added by renamer)</span></span>

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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--         f :: a -> a     -- Short for f :: forall {a}. a->a</span></span>

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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   HsOuterExplicit (explicit user quantifiation):</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--         f :: forall a. a->a</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When the user writes /visible/ quanitification</span></span>

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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--         T :: forall k -> k -> Type</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we use use HsOuterImplicit, wrapped around a HsForAllTy</span></span>

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<pre style="margin: 0;">+<span id="LC429" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for the visible quantification</span></span>

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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"><span class="cd">-- | TODO RGS: Docs</span></span>

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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HsOuterTyVarBndrs</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">pass</span></span>

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<br>

</li>

<li id="9355bef855426caf5f526925edf351b20f9a86c4">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9004c100c4ded5fe0894e957b857eed95bb07605#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="349" 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">@@ -349,6 +349,7 @@ tcHsSigType ctxt sig_ty</td>

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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Spit out the implication (and perhaps fail fast)</span></span>

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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures] in GHC.Tc.Solver</span></span>

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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsSigType 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implic</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitFlatConstraints</span> <span class="p">(</span><span class="n" style="color: #333;">mkImplicWC</span> <span class="p">(</span><span class="n" style="color: #333;">unitBag</span> <span class="n" style="color: #333;">implic</span><span class="p">))</span></span>

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<pre style="margin: 0;"> <span id="LC354" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC355" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">ty</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="358" 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="359" 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">@@ -358,59 +359,6 @@ tcHsSigType ctxt sig_ty</td>

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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;"> <span id="LC360" 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;">SigTypeSkol</span> <span class="n" style="color: #333;">ctxt</span></span>

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<pre style="margin: 0;"> <span id="LC361" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC361" 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="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- TODO RGS: Delete this (only for testing purposes)</span></span>

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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tc_hs_sig_type :: SkolemInfo -> LHsSigType GhcRn</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">               -> ContextKind -> TcM (Implication, TcType)</span></span>

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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Kind-checks/desugars an 'LHsSigType',</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--   solve equalities,</span></span>

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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--   and then kind-generalizes.</span></span>

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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- This will never emit constraints, as it uses solveEqualities internally.</span></span>

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<pre style="margin: 0;">-<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- No validity checking or zonking</span></span>

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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Returns also an implication for the unsolved constraints</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tc_hs_sig_type skol_info hs_sig_type ctxt_kind</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  -- | HsIB { hsib_ext = sig_vars, hsib_body = hs_ty } <- hs_sig_type</span></span>

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<pre style="margin: 0;">-<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  | L l (HsSig { sig_bndrs = outer_bndrs, sig_body = body_ty }) <- hs_sig_type</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  = do { let sig_vars = case outer_bndrs of</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                          HsOuterImplicit{hso_ximplicit = imp_vars} -> imp_vars</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                          HsOuterExplicit{}                         -> []</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             hs_ty = case outer_bndrs of</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       HsOuterImplicit{} -> body_ty</span></span>

</pre>

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379

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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                       HsOuterExplicit{hso_bndrs = exp_bndrs} -></span></span>

</pre>

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380

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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         L l $ HsForAllTy { hst_xforall = noExtField</span></span>

</pre>

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381

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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                          , hst_tele = HsForAllInvis { hsf_xinvis = noExtField</span></span>

</pre>

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382

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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                                                     , hsf_invis_bndrs = exp_bndrs }</span></span>

</pre>

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383

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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                          , hst_body = body_ty }</span></span>

</pre>

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384

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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; (tc_lvl, (wanted, (spec_tkvs, ty)))</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="385" 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">

385

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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">              <- pushTcLevelM                           $</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                 solveLocalEqualitiesX "tc_hs_sig_type" $</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                 -- See Note [Failure in local type signatures]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                 bindImplicitTKBndrs_Skol sig_vars      $</span></span>

</pre>

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389

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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                 do { kind <- newExpectedKind ctxt_kind</span></span>

</pre>

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390

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<pre style="margin: 0;">-<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                    ; tcLHsType hs_ty kind }</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="391" 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">

391

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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- Any remaining variables (unsolved in the solveLocalEqualities)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="392" 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">

392

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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- should be in the global tyvars, and therefore won't be quantified</span></span>

</pre>

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393

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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="394" 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">

394

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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; spec_tkvs <- zonkAndScopedSort spec_tkvs</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="395" 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">

395

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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; let ty1 = mkSpecForAllTys spec_tkvs ty</span></span>

</pre>

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396

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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="397" 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">

397

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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- This bit is very much like decideMonoTyVars in GHC.Tc.Solver,</span></span>

</pre>

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398

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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- but constraints are so much simpler in kinds, it is much</span></span>

</pre>

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399

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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- easier here. (In particular, we never quantify over a</span></span>

</pre>

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400

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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- constraint in a type.)</span></span>

</pre>

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401

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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; constrained <- zonkTyCoVarsAndFV (tyCoVarsOfWC wanted)</span></span>

</pre>

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402

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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; let should_gen = not . (`elemVarSet` constrained)</span></span>

</pre>

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403

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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"></span>

</pre>

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404

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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; kvs <- kindGeneralizeSome should_gen ty1</span></span>

</pre>

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405

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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"></span>

</pre>

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406

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<pre style="margin: 0;">-<span id="LC406" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- Build an implication for any as-yet-unsolved kind equalities</span></span>

</pre>

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407

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<pre style="margin: 0;">-<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       -- See Note [Skolem escape in type signatures]</span></span>

</pre>

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408

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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; implic <- buildTvImplication skol_info (kvs ++ spec_tkvs) tc_lvl wanted</span></span>

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409

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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="410" 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">

410

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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       ; return (implic, mkInfForAllTys kvs ty1) }</span></span>

</pre>

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411

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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

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412

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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="413" 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">

413

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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TODO RGS: This is broken. Figure out why.</span></span>

</pre>

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414

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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>

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415

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363

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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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;">Implication</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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416

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364

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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Kind-checks/desugars an 'LHsSigType',</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="420" 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="368" 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">@@ -420,20 +368,50 @@ tc_hs_sig_type :: SkolemInfo -> LHsSigType GhcRn</td>

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420

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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- No validity checking or zonking</span></span>

</pre>

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421

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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns also an implication for the unsolved constraints</span></span>

</pre>

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422

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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">outer_bndrs</span></span>

</pre>

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423

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<pre style="margin: 0;">-<span id="LC423" class="line" lang="haskell">                                       <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">sig_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}))</span> <span class="n" style="color: #333;">ctxt_kind</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell">                                       <span class="p">,</span> <span class="n" style="color: #333;">sig_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}))</span> <span class="n" style="color: #333;">ctxt_kind</span></span>

</pre>

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424

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372

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<pre style="margin: 0;"> <span id="LC372" 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>

</pre>

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425

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<pre style="margin: 0;">-<span id="LC425" 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;">tc_lvl</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">imp_or_exp_tkvs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)))</span></span>

</pre>

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426

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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell">              <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM</span>                           <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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427

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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell">                 <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- When there are /explicit/ user-written binders, e.g.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--      f :: forall a {k} (b::k). blah</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- treat it exactly like HsForAllTy; including its own,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- individual implication constraint, so we get proper</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="377" 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">

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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- telescope checking.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="378" 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">

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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- NB1: Do not be tempted to combine this implication constraint</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="379" 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">

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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--      with the one from kind generalisation. That messes up the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="380" 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">

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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--      telescope error message, by mixing the inferred kind</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="381" 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">

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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--      quantifiers with the explicit ones. See GHC.Tc.Types.Constraint</span></span>

</pre>

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382

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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--      Note [Checking telescopes], in the "don't mix up" bullet.</span></span>

</pre>

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383

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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- NB2: There are no implicit binders (the forall-or-nothing rule),</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="384" 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">

384

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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--   hence implicit_bndrs = []</span></span>

</pre>

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385

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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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386

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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- When there are only /implicit/ binders, added by the renamer, e.g.</span></span>

</pre>

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387

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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--     f :: a -> t a -> t a</span></span>

</pre>

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388

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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- then bring those implicit binders into scope here.</span></span>

</pre>

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389

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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"></span>

</pre>

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390

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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">body_hs_ty</span>     <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>

</pre>

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391

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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell">             <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span></span>

</pre>

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392

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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell">             <span class="p">(</span><span class="n" style="color: #333;">implicit_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body_hs_ty</span><span class="p">)</span></span>

</pre>

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393

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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">outer_bndrs</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="394" 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">

394

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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell">                    <span class="kt" style="color: #458; font-weight: 600;">HsOuterExplicit</span> <span class="p">{</span> <span class="n" style="color: #333;">hso_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="395" 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">

395

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<pre style="margin: 0;">+<span id="LC395" 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;">[]</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="o" style="font-weight: 600;">$</span></span>

</pre>

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396

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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell">                              <span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_xforall</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="397" 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">

397

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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell">                                         <span class="p">,</span> <span class="n" style="color: #333;">hst_tele</span>    <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span> <span class="p">{</span> <span class="n" style="color: #333;">hsf_xinvis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="398" 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">

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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell">                                                                       <span class="p">,</span> <span class="n" style="color: #333;">hsf_invis_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="399" 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">

399

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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell">                                         <span class="p">,</span> <span class="n" style="color: #333;">hst_body</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell">                    <span class="kt" style="color: #458; font-weight: 600;">HsOuterImplicit</span> <span class="p">{</span> <span class="n" style="color: #333;">hso_ximplicit</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell">                      <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">implicit_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tc_lvl</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_tkvs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)))</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell">              <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM</span>                            <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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405

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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell">                 <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span>  <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>

</pre>

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429

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<td class="diff-line-num new_line old" data-linenumber="407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell">                 <span class="n" style="color: #333;">bind<span class="idiff left">OuterSigTKBndrs_Skol</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">outer_bndrs</span></span><span class="idiff right">  </span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell">                 <span class="n" style="color: #333;">bind<span class="idiff left">ImplicitTKBndrs_Skol</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">implicit_bndrs</span></span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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430

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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell">                 <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">ctxt_kind</span></span>

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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">tcLHsType</span> <span class="n" style="color: #333;"><span class="idiff left right">body_</span>hs_ty</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Any remaining variables (unsolved in the solveLocalEqualities)</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;">-- should be in the global tyvars, and therefore won't be quantified</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">imp<span class="idiff left">_or_exp_tkvs</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">bitraverse</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">zonkAndScopedSort</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pure</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">imp_or_exp</span>_tkvs</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">either</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkInvisForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">imp_or_exp</span>_tkvs</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">imp<span class="idiff left">licit_tkvs</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">zonkAndScopedSort</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">implicit</span>_tkvs</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="437" 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">

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<td class="diff-line-num new new_line" data-linenumber="414" 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">

414

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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">mkSpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">implicit</span>_tkvs</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="437" 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">

437

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<td class="diff-line-num new_line" data-linenumber="415" 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">

415

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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="438" 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">

438

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<td class="diff-line-num new_line" data-linenumber="416" 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">

416

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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- This bit is very much like decideMonoTyVars in GHC.Tc.Solver,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="439" 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">

439

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<td class="diff-line-num new_line" data-linenumber="417" 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">

417

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<pre style="margin: 0;"> <span id="LC417" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- but constraints are so much simpler in kinds, it is much</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="446" 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="424" 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">@@ -446,10 +424,7 @@ tc_hs_sig_type skol_info (L loc (HsSig { sig_bndrs = outer_bndrs</td>

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<td class="diff-line-num old_line" data-linenumber="446" 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">

446

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<td class="diff-line-num new_line" data-linenumber="424" 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">

424

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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="447" 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">

447

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<td class="diff-line-num new_line" data-linenumber="425" 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">

425

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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Build an implication for any as-yet-unsolved kind equalities</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="448" 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">

448

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<td class="diff-line-num new_line" data-linenumber="426" 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">

426

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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolem escape in type signatures]</span></span>

</pre>

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449

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<td class="diff-line-num new_line old" data-linenumber="427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC449" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">implic</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">buildTvImplication</span> <span class="n" style="color: #333;">skol_info</span></span>

</pre>

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450

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<td class="diff-line-num new_line old" data-linenumber="427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell">                     <span class="p">(</span><span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">either</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">imp_or_exp_tkvs</span><span class="p">)</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="451" 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">

451

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<td class="diff-line-num new_line old" data-linenumber="427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC451" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- TODO RGS: The line above can put /visible/ foralls in a tyvar implication.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="452" 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">

452

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<td class="diff-line-num new_line old" data-linenumber="427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC452" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- I'm not sure if that's kosher.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="453" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="427" 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">

427

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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">implic</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">buildTvImplication</span> <span class="n" style="color: #333;">skol_info</span> <span class="p">(</span><span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">implicit_tkvs</span><span class="p">)</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="453" 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">

453

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<td class="diff-line-num new_line" data-linenumber="428" 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">

428

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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="454" 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">

454

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<td class="diff-line-num new_line" data-linenumber="429" 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">

429

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<pre style="margin: 0;"> <span id="LC429" 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;">implic</span><span class="p">,</span> <span class="n" style="color: #333;">mkInfForAllTys</span> <span class="n" style="color: #333;">kvs</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="455" 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">

455

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<td class="diff-line-num new_line" data-linenumber="430" 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">

430

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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1050" 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="1025" 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">@@ -1050,7 +1025,7 @@ tc_hs_type mode forall@(HsForAllTy { hst_tele = tele, hst_body = ty }) exp_kind</td>

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1050

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<td class="diff-line-num new_line" data-linenumber="1025" 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">

1025

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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndCaptureConstraints</span>      <span class="o" style="font-weight: 600;">$</span></span>

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1051

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<td class="diff-line-num new_line" data-linenumber="1026" 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">

1026

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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell">               <span class="n" style="color: #333;">bindExplicitTKTele_Skol_M</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">tele</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1052" 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">

1052

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<td class="diff-line-num new_line" data-linenumber="1027" 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">

1027

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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- The _M variant passes on the mode from the type, to</span></span>

</pre>

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1053

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<td class="diff-line-num new_line old" data-linenumber="1028" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1053" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- any wildards in kind signatures on the forall'd variables</span></span>

</pre>

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1028

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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- any wild<span class="idiff left right">c</span>ards in kind signatures on the forall'd variables</span></span>

</pre>

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1054

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<td class="diff-line-num new_line" data-linenumber="1029" 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">

1029

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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- e.g.      f :: _ -> Int -> forall (a :: _). blah</span></span>

</pre>

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1055

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1030

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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell">               <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">exp_kind</span></span>

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1031

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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- Why exp_kind?  See Note [Body kind of HsForAllTy]</span></span>

</pre>

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</li>

<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9004c100c4ded5fe0894e957b857eed95bb07605#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -163,21 +163,28 @@ simplifyTop wanteds</td>

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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Failure in local type signatures]</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualities</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>

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<pre style="margin: 0;">-<span id="LC166" 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;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>

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<pre style="margin: 0;">+<span id="LC166" 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;">"solveLocalEqualities {"</span> <span class="p">(</span><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;">"Called from"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">callsite</span> <span class="p">])</span></span>

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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">captureConstraints</span> <span class="n" style="color: #333;">thing_inside</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitFlatConstraints</span> <span class="n" style="color: #333;">wanted</span></span>

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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"solveLocalEqualitie }"</span> <span class="n" style="color: #333;">empty</span></span>

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>

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171

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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"></span>

</pre>

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170

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<td class="diff-line-num new_line" data-linenumber="172" 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">

172

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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">emitFlatConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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171

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<td class="diff-line-num new_line" data-linenumber="173" 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">

173

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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>

</pre>

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172

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174

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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">emitFlatConstraints</span> <span class="n" style="color: #333;">wanted</span></span>

</pre>

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173

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<td class="diff-line-num new_line old" data-linenumber="175" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC173" 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;">wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">zonkWC</span> <span class="n" style="color: #333;">wanted</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="174" 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">

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<td class="diff-line-num new new_line" data-linenumber="175" 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">

175

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<pre style="margin: 0;">+<span id="LC175" 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="c1" style="color: #998; font-style: italic;">-- Solve and zonk to esablish the</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="174" 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">

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<td class="diff-line-num new new_line" data-linenumber="176" 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">

176

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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- preconditions for floatKindEqualities</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="174" 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">

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<td class="diff-line-num new new_line" data-linenumber="177" 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">

177

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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell">         <span class="n" style="color: #333;">wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runTcSEqualities</span> <span class="p">(</span><span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="174" 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">

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<td class="diff-line-num new new_line" data-linenumber="178" 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">

178

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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">zonkWC</span> <span class="n" style="color: #333;">wanted</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="179" 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">

179

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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="174" 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">

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<td class="diff-line-num new new_line" data-linenumber="180" 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">

180

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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"emitFlatConstraints {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>

</pre>

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174

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<td class="diff-line-num new_line" data-linenumber="181" 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">

181

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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">floatKindEqualities</span> <span class="n" style="color: #333;">wanted</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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175

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<td class="diff-line-num new_line old" data-linenumber="182" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell">           <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <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;">"emitFlatConstraints<span class="idiff left right">:</span> failing"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="182" 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">

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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell">           <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <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;">"emitFlatConstraints<span class="idiff left right"> }</span> failing"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>

</pre>

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176

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<td class="diff-line-num new_line" data-linenumber="183" 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">

183

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell">                         <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">wanted</span> <span class="c1" style="color: #998; font-style: italic;">-- So they get reported!</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="177" 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">

177

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<td class="diff-line-num new_line" data-linenumber="184" 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">

184

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell">                         <span class="p">;</span> <span class="n" style="color: #333;">failM</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="178" 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">

178

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<td class="diff-line-num new_line" data-linenumber="185" 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">

185

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell">           <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>

</pre>

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179

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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell">              <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCts</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"emitFlatConstraints<span class="idiff left right">:</span>"</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"emitFlatConstraints<span class="idiff left right"> }</span>"</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC188" 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;">"simples:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>

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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell">                           <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"holes:  "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">holes</span> <span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">emitHoles</span> <span class="n" style="color: #333;">holes</span> <span class="c1" style="color: #998; font-style: italic;">-- Holes don't need promotion</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="188" 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>

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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">@@ -188,6 +195,11 @@ floatKindEqualities :: WantedConstraints -> Maybe (Bag Ct, Bag Hole)</td>

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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Return Nothing if any constraints can't be floated (captured</span></span>

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<pre style="margin: 0;"> <span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- by skolems), or if there is an insoluble constraint, or</span></span>

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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- IC_Telescope telescope error</span></span>

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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition 1: we have tried to solve the 'wanteds', both so that</span></span>

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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    the ic_status field is set, and because solving can make constraints</span></span>

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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    more floatable.</span></span>

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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition 2: the 'wanteds' are zonked, since floatKindEqualities</span></span>

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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    is not monadic</span></span>

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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"><span class="n" style="color: #333;">floatKindEqualities</span> <span class="n" style="color: #333;">wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">wc</span></span>

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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell">    <span class="n" style="color: #333;">float_wc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span><span class="p">)</span></span>

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<br>

</li>

<li id="3b6d78a50c8462304f843b952a88e531718dbbd2">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9004c100c4ded5fe0894e957b857eed95bb07605#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -1235,7 +1235,7 @@ all at once, creating one implication constraint for the lot:</td>

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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  that binds existentials, where the type of the data constructor is</span></span>

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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  known to be valid (it in tcConPat), no need for the check.</span></span>

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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC1238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  So the check is done <span class="idiff left right">if and only if ic_info is ForAllSkol</span></span></span>

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<pre style="margin: 0;">+<span id="LC1238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  So the check is done <span class="idiff left right">/if and only if/ ic_info is ForAllSkol.</span></span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1239" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* If ic_info is (ForAllSkol dt dvs), the dvs::SDoc displays the</span></span>

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1241

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1241

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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  original, user-written type variables.</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1245" 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="1245" 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">@@ -1245,6 +1245,18 @@ all at once, creating one implication constraint for the lot:</td>

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<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  constraint solver a chance to make that bad-telescope test!  Hence</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  the extra guard in emitResidualTvConstraint; see #16247</span></span>

</pre>

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1247

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<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1248" 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">

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<pre style="margin: 0;">+<span id="LC1248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Don't mix up inferred and explicit variables in the same implication</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  constraint.  E.g.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      foo :: forall a kx (b :: kx). SameKind a b</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1251" 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">

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<pre style="margin: 0;">+<span id="LC1251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  We want an implication</span></span>

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<td class="diff-line-num new new_line" data-linenumber="1252" 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">

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<pre style="margin: 0;">+<span id="LC1252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      Implic { ic_skol = [(a::kx), kx, (b::kx)], ... }</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1253" 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">

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<pre style="margin: 0;">+<span id="LC1253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  but GHC will attempt to quantify over kx, since it is free in (a::kx),</span></span>

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<pre style="margin: 0;">+<span id="LC1254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  and it's hopelessly confusing to report an error about quantified</span></span>

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<td class="diff-line-num new new_line" data-linenumber="1255" 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">

1255

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<pre style="margin: 0;">+<span id="LC1255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  variables   kx (a::kx) kx (b::kx).</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1256" 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">

1256

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<pre style="margin: 0;">+<span id="LC1256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Instead, the outer quantification over kx should be in a separate</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1257" 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">

1257

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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  implication. TL;DR: an explicit forall should generate an implication</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1258" 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">

1258

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<pre style="margin: 0;">+<span id="LC1258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  quantified only over those explicitly quantified variables.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1259" 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">

1259

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<pre style="margin: 0;">+<span id="LC1259" class="line" lang="haskell"></span>

</pre>

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1248

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<td class="diff-line-num new_line" data-linenumber="1260" 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">

1260

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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Needed evidence variables]</span></span>

</pre>

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1249

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1261

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<pre style="margin: 0;"> <span id="LC1261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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1250

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<td class="diff-line-num new_line" data-linenumber="1262" 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">

1262

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<pre style="margin: 0;"> <span id="LC1262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Th ic_need_evs field holds the free vars of ic_binds, and all the</span></span>

</pre>

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