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<h3>
Ryan Scott pushed to branch wip/T18023
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7">7cc4cd4c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-08T07:29:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use conLikeUserTyVarBinders to quantify field selector types
This patch:
1. Writes up a specification for how the types of top-level field
selectors should be determined in a new section of the GHC User's
Guide, and
2. Makes GHC actually implement that specification by using
`conLikeUserTyVarBinders` in `mkOneRecordSelector` to preserve the
order and specificity of type variables written by the user.
Fixes #18023.
</pre>
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<h4>12 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#b452cc5181a4af3460c43a4e3e4b5edaa238b4e0">
compiler/GHC/Core/ConLike.hs
</a>
</li>
<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
</a>
</li>
<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#5ed3ecf19a26af612b8100b2639f8e153f580fe9">
compiler/GHC/Tc/TyCl/Utils.hs
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<li class="file-stats">
<a href="#7ac989ce2970eedd8fbc550755c61f8fb2a48e91">
docs/users_guide/exts/existential_quantification.rst
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<li class="file-stats">
<a href="#590e4eca5d45cad92110e238705613b107b4e09c">
<span class="new-file">
+
docs/users_guide/exts/field_selectors_and_type_applications.rst
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<li class="file-stats">
<a href="#b26dc8b26d87b9a5d86567622e7451c78658a035">
docs/users_guide/exts/gadt.rst
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<li class="file-stats">
<a href="#217aba8d015e3556e1945000eb518cf5d41df639">
docs/users_guide/exts/rank_polymorphism.rst
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<li class="file-stats">
<a href="#3f2c15a7d7bbe96510dfae948f03694a017ecc1d">
docs/users_guide/exts/records.rst
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<li class="file-stats">
<a href="#89291197f365f29a35d9e9ce8131b3620693957d">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/T18023.hs
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</a>
</li>
<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
</a>
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</ul>
<h4>Changes:</h4>
<li id="b452cc5181a4af3460c43a4e3e4b5edaa238b4e0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#b452cc5181a4af3460c43a4e3e4b5edaa238b4e0"><strong>compiler/GHC/Core/ConLike.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="12" 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="12" 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">@@ -12,6 +12,7 @@ module GHC.Core.ConLike (</td>
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<td class="diff-line-num old_line" data-linenumber="12" 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">
12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeArity</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeFieldLabels</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeInstOrigArgTys</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeUserTyVarBinders</span></span>
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<td class="diff-line-num new_line" data-linenumber="16" 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="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeExTyCoVars</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeName</span></span>
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<td class="diff-line-num new_line" data-linenumber="18" 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="LC18" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">conLikeStupidTheta</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="113" 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="114" 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">@@ -113,6 +114,18 @@ conLikeInstOrigArgTys (RealDataCon data_con) tys =</td>
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<td class="diff-line-num new_line" data-linenumber="114" 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="LC114" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeInstOrigArgTys</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">pat_syn</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"> <span class="n" style="color: #333;">patSynInstArgTys</span> <span class="n" style="color: #333;">pat_syn</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cd">-- | 'TyVarBinder's for the type variables of the 'ConLike'. For pattern</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- synonyms, this will always consist of the universally quantified variables</span></span>
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<td class="diff-line-num new new_line" data-linenumber="119" 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="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- followed by the existentially quantified type variables. For data</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constructors, the situation is slightly more complicated—see</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @Note [DataCon user type variable binders]@ in "GHC.Core.DataCon".</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeUserTyVarBinders</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVarBinder</span><span class="p">]</span></span>
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<td class="diff-line-num new new_line" data-linenumber="123" 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="LC123" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeUserTyVarBinders</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"> <span class="n" style="color: #333;">dataConUserTyVarBinders</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeUserTyVarBinders</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="n" style="color: #333;">pat_syn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="n" style="color: #333;">patSynUnivTyVarBinders</span> <span class="n" style="color: #333;">pat_syn</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">patSynExTyVarBinders</span> <span class="n" style="color: #333;">pat_syn</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The order here is because of the order in `GHC.Tc.TyCl.PatSyn`.</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="cd">-- | Existentially quantified type/coercion variables</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeExTyCoVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ConLike</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="n" style="color: #333;">conLikeExTyCoVars</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">dcon1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConExTyCoVars</span> <span class="n" style="color: #333;">dcon1</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#6fcf64907fb5bdd93082d2d1eb94e4566e735865"><strong>compiler/GHC/Core/DataCon.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">@@ -384,7 +384,9 @@ data DataCon</td>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkT :: forall a b. (a ~ [b]) => b -> T a</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkT :: forall b. b -> T [b]</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Each equality is of the form (a ~ ty), where 'a' is one of</span></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the universally quantified type variables</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the universally quantified type variables. Moreover, the</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- only place in the DataCon where this 'a' will occur is in</span></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- dcUnivTyVars. See [The dcEqSpec domain invariant].</span></span>
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The next two fields give the type context of the data constructor</span></span>
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (aside from the GADT constraints,</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">@@ -595,6 +597,35 @@ dcUserTyVarBinders, as the name suggests, is the one that users will see most of</td>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the time. It's used when computing the type signature of a data constructor (see</span></span>
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<pre style="margin: 0;"> <span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dataConUserType), and as a result, it's what matters from a TypeApplications</span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">perspective.</span></span>
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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The dcEqSpec domain invariant]</span></span>
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602
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<pre style="margin: 0;">+<span id="LC602" 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="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this example of a GADT constructor:</span></span>
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604
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"></span>
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605
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Y a where</span></span>
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606
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkY :: Bool -> Y Bool</span></span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The user-written type of MkY is `Bool -> Y Bool`, but what is the underlying</span></span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Core type for MkY? There are two conceivable possibilities:</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"></span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. MkY :: forall a. (a ~# Bool) => Bool -> Y a</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. MkY :: forall a. (a ~# Bool) => a -> Y a</span></span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"></span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In practice, GHC picks (1) as the Core type for MkY. This is because we</span></span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">maintain an invariant that the type variables in the domain of dcEqSpec will</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only ever appear in the dcUnivTyVars. As a consequence, the type variables in</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the domain of dcEqSpec will /never/ appear in the dcExTyCoVars, dcOtherTheta,</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcOrigArgTys, or dcOrigResTy; these can only ever mention variables from</span></span>
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619
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcUserTyVarBinders, which excludes things in the domain of dcEqSpec.</span></span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See Note [DataCon user type variable binders].) This explains why GHC would</span></span>
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621
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not pick (2) as the Core type, since the argument type `a` mentions a type</span></span>
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622
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable in the dcEqSpec.</span></span>
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623
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are certain parts of the codebase where it is convenient to apply the</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution arising from the dcEqSpec to the dcUnivTyVars in order to obtain</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the user-written return type of a GADT constructor. A consequence of the</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcEqSpec domain invariant is that you /never/ need to apply the substitution</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to any other part of the constructor type, as they don't require it.</span></span>
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<pre style="margin: 0;"> <span id="LC629" 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="LC630" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"><span class="cd">-- | Data Constructor Representation</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -645,11 +645,7 @@ dsExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = fields</td>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_alt</span> <span class="n" style="color: #333;">upd_fld_env</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;"> <span id="LC646" 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;">let</span> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">eq_spec</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="n" style="color: #333;">prov_theta</span><span class="p">,</span> <span class="n" style="color: #333;">_req_theta</span><span class="p">,</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFullSig</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">user_tvs</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">con</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">dataConUserTyVars</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">univ_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The order here is because of the order in `GHC.Tc.TyCl.PatSyn`.</span></span>
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"> <span class="n" style="color: #333;">user_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">conLikeUserTyVarBinders</span> <span class="n" style="color: #333;">con</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="n" style="color: #333;">in_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">in_inst_tys</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"> <span class="n" style="color: #333;">out_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">out_inst_tys</span></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#5ed3ecf19a26af612b8100b2639f8e153f580fe9"><strong>compiler/GHC/Tc/TyCl/Utils.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">@@ -872,19 +872,17 @@ mkOneRecordSelector all_cons idDetails fl</td>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Selector type; Note [Polymorphic selectors]</span></span>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="n" style="color: #333;">field_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFieldType</span> <span class="n" style="color: #333;">con1</span> <span class="n" style="color: #333;">lbl</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">data_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="n" style="color: #333;">inst_tys</span></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">data_tv_set</span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">data_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">data_tvbs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">tvb</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">binderVar</span> <span class="n" style="color: #333;">tvb</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">data_tv_set</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">conLikeUserTyVarBinders</span> <span class="n" style="color: #333;">con1</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">data_tv_set</span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">inst_tys</span></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="n" style="color: #333;">is_naughty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">field_ty</span> <span class="p">`</span><span class="n" style="color: #333;">subVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">data_tv_set</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">field_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">field_theta</span><span class="p">,</span> <span class="n" style="color: #333;">field_tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitSigmaTy</span> <span class="n" style="color: #333;">field_ty</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="n" style="color: #333;">sel_ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_naughty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitTy</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Naughty record selectors]</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk<span class="idiff left">SpecForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">data_tvs</span></span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk<span class="idiff left">ForAllTys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">data_tvbs</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeStupidTheta</span> <span class="n" style="color: #333;">con1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Urgh!</span></span>
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">data_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">field_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">field_theta</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- req_theta is empty for normal DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">req_theta</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"> <span class="n" style="color: #333;">field_tau</span></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">data_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="n" style="color: #333;">field_ty</span></span>
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC887" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the binding: sel (C2 { fld = x }) = x</span></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sel (C7 { fld = x }) = x</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">@@ -936,6 +934,16 @@ mkOneRecordSelector all_cons idDetails fl</td>
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936
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">univ_tvs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">eq_spec</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">req_theta</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">data_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">conLikeFullSig</span> <span class="n" style="color: #333;">con1</span></span>
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937
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935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"></span>
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938
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTvSubstPrs</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">eqSpecPair</span> <span class="n" style="color: #333;">eq_spec</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC937" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inst_tys corresponds to one of the following:</span></span>
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<pre style="margin: 0;">+<span id="LC938" 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="LC939" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The arguments to the user-written return type (for GADT constructors).</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In this scenario, eq_subst provides a mapping from the universally</span></span>
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantified type variables to the argument types. Note that eq_subst</span></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- does not need to be applied to any other part of the DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see Note [The dcEqSpec domain invariant] in GHC.Core.DataCon).</span></span>
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<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * The universally quantified type variables</span></span>
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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (for Haskell98-style constructors and pattern synonyms). In these</span></span>
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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- scenarios, eq_subst is an empty substitution.</span></span>
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<pre style="margin: 0;"> <span id="LC947" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyVars</span> <span class="n" style="color: #333;">eq_subst</span> <span class="n" style="color: #333;">univ_tvs</span></span>
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948
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"></span>
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949
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"> <span class="n" style="color: #333;">unit_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLHsTupleExpr</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -945,13 +953,44 @@ mkOneRecordSelector all_cons idDetails fl</td>
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Polymorphic selectors]</span></span>
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<pre style="margin: 0;"> <span id="LC954" 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="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We take care to build the type of a polymorphic selector in the right</span></span>
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">order, so that visible type application works.</span></span>
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"></span>
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950
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Ord a => T a = MkT { field :: forall b. (Num a, Show b) => (a, b) }</span></span>
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951
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want</span></span>
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> field :: forall a. Ord a => T a -> forall b. (Num a, Show b) => (a, b)</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">order, so that visible type application works according to the specification in</span></span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the GHC User's Guide (see the "Field selectors and TypeApplications" section).</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We won't bother rehashing the entire specification in this Note, but the tricky</span></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">part is dealing with GADT constructor fields. Here is an appropriately tricky</span></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example to illustrate the challenges:</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# LANGUAGE PolyKinds #-}</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a b where</span></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: forall b a x.</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { field1 :: forall c. (Num a, Show c) => (Either a c, Proxy b)</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , field2 :: x</span></span>
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967
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> }</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> T a b</span></span>
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Our goal is to obtain the following type for `field1`:</span></span>
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> field1 :: forall {k} (b :: k) a.</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T a b -> forall c. (Num a, Show c) => (Either a c, Proxy b)</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(`field2` is naughty, per Note [Naughty record selectors], so we cannot turn</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it into a top-level field selector.)</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some potential gotchas, inspired by #18023:</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Since the user wrote `forall b a x.` in the type of `MkT`, we want the `b`</span></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to appear before the `a` when quantified in the type of `field1`.</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. On the other hand, we *don't* want to quantify `x` in the type of `field1`.</span></span>
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983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is because `x` does not appear in the GADT return type, so it is not</span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> needed in the selector type.</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Because of PolyKinds, the kind of `b` is generalized to `k`. Moreover, since</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this `k` is not written in the source code, it is inferred (i.e., not</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> available for explicit type applications) and thus written as {k} in the type</span></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of `field1`.</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"></span>
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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In order to address these gotchas, we start by looking at the</span></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">conLikeUserTyVarBinders, which gives the order and specificity of each binder.</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This effectively solves (1) and (3). To solve (2), we filter the binders to</span></span>
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993
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">leave only those that are needed for the selector type.</span></span>
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955
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994
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"></span>
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956
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Naughty record selectors]</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -18,6 +18,34 @@ Full details</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">Language</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">* Record field selectors are now given type signatures that preserve the</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> user-written order of quantified type variables. Moreover, field selector</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> type signatures no longer make inferred type variables avaiable for explicit</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> type application. See :ref:`field-selectors-and-type-applications` for more</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> details.</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> In certain situations, this will constitute a breaking change as this can</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> affect :extension:`TypeApplications`. For instance, given the following</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> definitions: ::</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> {-# LANGUAGE PolyKinds #-}</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> newtype P a = MkP { unP :: Proxy a }</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> newtype N :: Type -> Type -> Type where</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> MkN :: forall b a. { unN :: Either a b } -> N a b</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"> Previous versions of GHC would give the following types to ``unP`` and</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> ``unN``: ::</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> unP :: forall k (a :: k). P a -> Proxy a</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> unN :: forall a b. N a b -> Either a b</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> GHC will now give them the following types instead: ::</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"> unP :: forall {k} (a :: k). P a -> Proxy a</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext"> unN :: forall b a. N a b -> Either a b</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">* In obscure scenarios, GHC now rejects programs it previously accepted, but</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext"> with unhelpful types. For example, if (with ``-XPartialTypeSignatures``) you</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext"> were to write ``x :: forall (f :: forall a (b :: a -> Type). b _). f _``, GHC previously</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">@@ -40,7 +68,7 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext"> There is a chance we will tweak the lookup scheme in the future, to make this</span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext"> workaround unnecessary.</span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext"><span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#7ac989ce2970eedd8fbc550755c61f8fb2a48e91"><strong>docs/users_guide/exts/existential_quantification.rst</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">@@ -116,7 +116,11 @@ example: ::</td>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext"> }</span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">Here ``tag`` is a public field, with a well-typed selector function</span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="plaintext">``tag :: Counter a -> a``. The ``self`` type is hidden from the outside;</span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext">``tag :: Counter a -> a``. See :ref:`field-selectors-and-type-applications`</span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext">for a full description of how the types of top-level field selectors are</span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">determined.</span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext">The ``self`` type is hidden from the outside;</span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext">any attempt to apply ``_this``, ``_inc`` or ``_display`` as functions</span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">will raise a compile-time error. In other words, *GHC defines a record</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext">selector function only for fields whose type does not mention the</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#590e4eca5d45cad92110e238705613b107b4e09c"><strong>docs/users_guide/exts/field_selectors_and_type_applications.rst</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">.. _field-selectors-and-type-applications:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Field selectors and ``TypeApplications``</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">----------------------------------------</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">Field selectors can be used in conjunction with :extension:`TypeApplications`,</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">as described in :ref:`visible-type-application`. The type of a field selector</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">is constructed by using the surrounding definition as context. This section</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">provides a specification for how this construction works. We will explain it</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">by considering three different forms of field selector, each of which is a</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">minor variation of the same general theme.</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">Field selectors for Haskell98-style data constructors</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">Consider the following example: ::</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> data T a b = MkT { unT :: forall e. Either e a }</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">This data type uses a Haskell98-style declaration. The only part of this data</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">type that is not Haskell98 code is ``unT``, whose type uses higher-rank</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">polymorphism (:ref:`arbitrary-rank-polymorphism`). To construct the type of</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">the ``unT`` field selector, we will assemble the following:</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">1. The type variables quantified by the data type head</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> (``forall a b. <...>``).</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">2. The return type of the data constructor</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> (``<...> T a b -> <...>``). By virtue of this being a Haskell98-style</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> declaration, the order of type variables in the return type will always</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> coincide with the order in which they are quantified.</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext">3. The type of the field</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> (``<...> forall e. Either e a``).</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">The final type of ``unT`` is therefore</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">``forall a b. T a b -> forall e. Either e a``. As a result, one way to use</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">``unT`` with :extension:`TypeApplications` is</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">``unT @Int @Bool (MkT (Right 1)) @Char``.</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">Field selectors for GADT constructors</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">Field selectors for GADT constructors (:ref:`gadt-style`) are slightly more</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext">involved. Consider the following example: ::</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext"> data G a b where</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"> MkG :: forall x n a. (Eq a, Show n)</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext"> => { unG1 :: forall e. Either e (a, x), unG2 :: n } -> G a (Maybe x)</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">The ``MkG`` GADT constructor has two records, ``unG1`` and ``unG2``.</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">However, only ``unG1`` can be used as a top-level field selector. ``unG2``</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">cannot because it is a "hidden" selector (see :ref:`existential-records`); its</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">type mentions a free variable ``n`` that does not appear in the result type</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">``G a (Maybe x)``. On the other hand, the only free type variables in the type</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">of ``unG1`` are ``a`` and ``x``, so ``unG1`` is fine to use as a top-level</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">function.</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">To construct the type of the ``unG1`` field selector, we will assemble</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">the following:</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext">1. The subset of type variables quantified by the GADT constructor that are</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"> mentioned in the return type. Note that the order of these variables follows</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext"> the same principles as in :ref:`ScopedSort`.</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext"> If the constructor explicitly quantifies its type variables at the beginning</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext"> of the type, then the field selector type will quantify them in the same</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext"> order (modulo any variables that are dropped due to not being mentioned in</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext"> the return type).</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext"> If the constructor implicitly quantifies its type variables, then the field</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"> selector type will quantify them in the left-to-right order that they appear</span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext"> in the field itself.</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext"> In this example, ``MkG`` explicitly quantifies ``forall x n a.``, and of</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext"> those type variables, ``a`` and ``x`` are mentioned in the return type.</span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext"> Therefore, the type of ``unG1`` starts as ``forall x a. <...>``.</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext"> If ``MkG`` had not used an explicit ``forall``, then they would have instead</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext"> been ordered as ``forall a x. <...>``, since ``a`` appears to the left of</span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"> ``x`` in the field type.</span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext">2. The GADT return type</span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext"> (``<...> G a (Maybe x) -> ...``).</span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext">3. The type of the field</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"> (``<...> -> forall e. Either e (a, x)``).</span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="plaintext">The final type of ``unG1`` is therefore</span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext">``forall x a. G a (Maybe x) -> forall e. Either e (a, x)``. As a result, one</span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext">way to use ``unG1`` with :extension:`TypeApplications` is</span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext">``unG1 @Int @Bool (MkG (Right (True, 42)) ()) @Char``.</span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext">Field selectors for pattern synonyms</span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">Certain record pattern synonyms (:ref:`record-patsyn`) can give rise to</span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">top-level field selectors. Consider the following example: ::</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext"> pattern P :: forall a. Read a</span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext"> => forall n. (Eq a, Show n)</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext"> => (forall e. Either e (a, Bool)) -> n -> G a (Maybe Bool)</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext"> pattern P {unP1, unP2} = MkG unP1 unP2</span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">We can only make field selectors for pattern synonym records that do not</span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">mention any existential type variables whatsoever in their types, per</span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext">:ref:`record-patsyn`. (This is a stronger requirement than for GADT records,</span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext">whose types can mention existential type variables provided that they are also</span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext">mentioned in the return type.) We can see that ``unP2`` cannot be used as a</span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext">top-level field selector since its type has a free type variable ``n``, which</span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext">is existential. ``unP1`` is fine, on the other hand, as its type only has one</span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext">free variable, the universal type variable ``a``.</span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext">To construct the type of the ``unP1`` field selector, we will assemble</span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">the following:</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext">1. The universal type variables</span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext"> (``forall a. <...>``).</span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext">2. The required constraints</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext"> (``<...> Read a => <...>``).</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext">3. The pattern synonym return type</span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> (``<...> G a (Maybe Bool) -> <...>``).</span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext">4. The type of the field</span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"> (``<...> -> forall e. Either e (a, Bool)``).</span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext">The final type of ``unP1`` is therefore</span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext">``forall a. Read a => G a (Maybe Bool) -> forall e. Either e (a, Bool)``. As a</span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">result, one way to use ``unP1`` with :extension:`TypeApplications` is</span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext">``unP1 @Double (MkG (Right (4.5, True)) ()) @Char``.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#b26dc8b26d87b9a5d86567622e7451c78658a035"><strong>docs/users_guide/exts/gadt.rst</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">@@ -118,6 +118,9 @@ also sets :extension:`GADTSyntax` and :extension:`MonoLocalBinds`.</td>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext"> num :: Term Int -> Term Int</span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext"> arg :: Term Bool -> Term Int</span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext"> See :ref:`field-selectors-and-type-applications` for a full description of</span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"> how the types of top-level field selectors are determined.</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext">- When pattern-matching against data constructors drawn from a GADT,</span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext"> for example in a ``case`` expression, the following rules apply:</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#217aba8d015e3556e1945000eb518cf5d41df639"><strong>docs/users_guide/exts/rank_polymorphism.rst</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">.. _arbitrary-rank-polymorphism:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">Arbitrary-rank polymorphism</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">===========================</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#3f2c15a7d7bbe96510dfae948f03694a017ecc1d"><strong>docs/users_guide/exts/records.rst</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">@@ -7,6 +7,7 @@ Records</td>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> :maxdepth: 1</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> traditional_record_syntax</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> field_selectors_and_type_applications</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> disambiguate_record_fields</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> duplicate_record_fields</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> record_puns</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#89291197f365f29a35d9e9ce8131b3620693957d"><strong>testsuite/tests/typecheck/should_compile/T18023.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18023</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkN</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">{</span> <span class="n" style="color: #333;">unN</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">toN</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">toN</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkN</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">fromN</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">N</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">fromN</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unN</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">P</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;">MkP</span> <span class="p">{</span> <span class="n" style="color: #333;">unP</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">toPTrue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">toPTrue</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkP</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">fromPTrue</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">fromPTrue</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unP</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">P2</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkP2</span> <span class="p">{</span> <span class="n" style="color: #333;">unP2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">toP2True</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">P2</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">toP2True</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkP2</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">fromP2True</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">P2</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="n" style="color: #333;">fromP2True</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unP2</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">True</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7cc4cd4cbc8d3cc8b03fbced9b57cf6b266fecf7#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</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">@@ -702,3 +702,4 @@ test('T17792', normal, compile, [''])</td>
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702
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17024</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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703
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703
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17021a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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704
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704
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18005</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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705
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18023</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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