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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/60dd0659f5d42e1a2f7620f55a1e8e3befceffe2">60dd0659</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-09-21T15:35:30+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>3 changed files:</h4>
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<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60dd0659f5d42e1a2f7620f55a1e8e3befceffe2#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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361
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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="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>
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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>
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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>
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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>
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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>
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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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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60dd0659f5d42e1a2f7620f55a1e8e3befceffe2#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>
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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="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>
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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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362
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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>
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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>
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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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368
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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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369
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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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370
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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>
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371
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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>
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372
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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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373
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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>
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374
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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>
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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>
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376
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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>
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377
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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>
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378
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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386
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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>
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387
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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>
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388
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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>
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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>
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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>
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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>
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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>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"></span>
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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>
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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>
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396
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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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>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"></span>
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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>
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405
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<pre style="margin: 0;">-<span id="LC405" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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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>
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414
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362
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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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<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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<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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -420,20 +368,49 @@ tc_hs_sig_type :: SkolemInfo -> LHsSigType GhcRn</td>
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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>
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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>
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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>
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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>
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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>
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424
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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>
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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>
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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;">$</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span> <span class="o" style="font-weight: 600;">$</span></span>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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.</span></span>
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<pre style="margin: 0;">+<span id="LC382" 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>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hence implicit_bndrs = []</span></span>
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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;">--</span></span>
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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;">-- When there are only /implicit/ binders, added by the renamer, e.g.</span></span>
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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;">-- f :: a -> t a -> t a</span></span>
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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;">-- then bring those implicit binders into scope here.</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"></span>
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389
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<pre style="margin: 0;">+<span id="LC389" 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>
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390
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<pre style="margin: 0;">+<span id="LC390" 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>
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391
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<pre style="margin: 0;">+<span id="LC391" 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>
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392
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<pre style="margin: 0;">+<span id="LC392" 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>
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393
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<pre style="margin: 0;">+<span id="LC393" 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>
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394
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<pre style="margin: 0;">+<span id="LC394" 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>
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395
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<pre style="margin: 0;">+<span id="LC395" 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>
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396
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<pre style="margin: 0;">+<span id="LC396" 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>
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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;">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>
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398
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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;">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>
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399
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<pre style="margin: 0;">+<span id="LC399" 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>
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400
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<pre style="margin: 0;">+<span id="LC400" 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>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"></span>
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402
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<pre style="margin: 0;">+<span id="LC402" 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>
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403
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<pre style="margin: 0;">+<span id="LC403" 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>
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<pre style="margin: 0;">+<span id="LC404" 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;">$</span></span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"> <span class="n" style="color: #333;">bind<span class="idiff left">OuterSigTKBndrs_Skol</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">outer_bndrs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC406" 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>
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<pre style="margin: 0;"> <span id="LC407" 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="LC408" 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>
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<pre style="margin: 0;"> <span id="LC409" 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="LC410" 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>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="haskell"></span>
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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>
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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>
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<pre style="margin: 0;">+<span id="LC412" 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>
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<pre style="margin: 0;">+<span id="LC413" 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>
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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC415" 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>
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<pre style="margin: 0;"> <span id="LC416" 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>
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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">@@ -446,10 +423,7 @@ tc_hs_sig_type skol_info (L loc (HsSig { sig_bndrs = outer_bndrs</td>
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423
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"></span>
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424
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<pre style="margin: 0;"> <span id="LC424" 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>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolem escape in type signatures]</span></span>
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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>
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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>
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451
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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>
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452
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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>
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426
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<pre style="margin: 0;">+<span id="LC426" 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>
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453
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427
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"></span>
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428
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<pre style="margin: 0;"> <span id="LC428" 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>
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455
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429
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1024" 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 +1024,7 @@ tc_hs_type mode forall@(HsForAllTy { hst_tele = tele, hst_body = ty }) exp_kind</td>
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1050
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1024
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<pre style="margin: 0;"> <span id="LC1024" 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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1025
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<pre style="margin: 0;"> <span id="LC1025" 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>
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1052
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1026
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<pre style="margin: 0;"> <span id="LC1026" 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>
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1053
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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>
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<pre style="margin: 0;">+<span id="LC1027" 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>
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1054
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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;">-- e.g. f :: _ -> Int -> forall (a :: _). blah</span></span>
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1055
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1029
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<pre style="margin: 0;"> <span id="LC1029" 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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1056
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1030
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why exp_kind? See Note [Body kind of HsForAllTy]</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/60dd0659f5d42e1a2f7620f55a1e8e3befceffe2#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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163
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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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164
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164
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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>
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165
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"><span class="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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166
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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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167
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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>
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167
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168
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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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169
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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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168
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170
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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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169
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"></span>
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170
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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>
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171
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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>
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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>
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173
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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>
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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>
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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>
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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>
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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>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"></span>
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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>
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174
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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>
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175
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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>
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182
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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>
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176
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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>
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177
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184
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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">failM</span> <span class="p">}</span></span>
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178
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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>
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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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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 class="idiff left right">:</span>"</span> <span class="o" style="font-weight: 600;">$</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">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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181
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188
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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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182
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189
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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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183
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190
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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="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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188
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195
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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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189
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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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190
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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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191
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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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192
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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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193
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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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