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<h3>
Marge Bot pushed to branch master
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/57c3db9612463426e1724816fd3f98142fec0e31">57c3db96</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-10-31T02:53:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make typechecker equality consider visibility in ForAllTys
Previously, `can_eq_nc'` would equate `ForAllTy`s regardless of their
`ArgFlag`, including `forall i -> i -> Type` and `forall i. i -> Type`! To fix
this, `can_eq_nc'` now uses the `sameVis` function to first check if the
`ArgFlag`s are equal modulo specificity. I have also updated `tcEqType`'s
implementation to match this behavior. For more explanation on the "modulo
specificity" part, see the new `Note [ForAllTy and typechecker equality]`
in `GHC.Tc.Solver.Canonical`.
While I was in town, I fixed some related documentation issues:
* I added `Note [Typechecker equality]` to `GHC.Tc.Utils.TcType` to describe
what exactly distinguishes `can_eq_nc'` and `tcEqType` (which implement
typechecker equality) from `eqType` (which implements definitional equality,
which does not care about the `ArgFlags` of `ForAllTy`s at all).
* The User's Guide had some outdated prose on the specified/inferred
distinction being different for types and kinds, a holdover from #15079. This
is no longer the case on today's GHC, so I removed this prose, added some new
prose to take its place, and added a regression test for the programs in
#15079.
* The User's Guide had some _more_ outdated prose on inferred type variables
not being allowed in `default` type signatures for class methods, which is no
longer true as of the resolution of #18432.
* The related `Note [Deferred Unification]` was being referenced as
`Note [Deferred unification]` elsewhere, which made it harder to `grep`
for. I decided to change the name of the Note to `Deferred unification`
for consistency with the capitalization style used for most other Notes.
Fixes #18863.
</pre>
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</ul>
<h4>14 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
</a>
</li>
<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
</a>
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#fa050e1532c92b2ffc94692d8b368f3fefa3196d">
docs/users_guide/exts/poly_kinds.rst
</a>
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<li class="file-stats">
<a href="#8c04ae62547f5d5061b0b883fa187284074934e3">
docs/users_guide/exts/type_applications.rst
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<li class="file-stats">
<a href="#4819f4fe8b315fee7a2e3da866dd282217505bba">
<span class="new-file">
+
testsuite/tests/saks/should_fail/T18863a.hs
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</a>
</li>
<li class="file-stats">
<a href="#2aa4d0077ed84ef50ebf5b951f2a4bbea2913052">
<span class="new-file">
+
testsuite/tests/saks/should_fail/T18863a.stderr
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</li>
<li class="file-stats">
<a href="#269dcd38c8abd7b01ba4d46aa175233a7180a070">
<span class="new-file">
+
testsuite/tests/saks/should_fail/T18863b.hs
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<li class="file-stats">
<a href="#9fcff6eb387c837a6a25fa40cedcaecf7e24b20e">
<span class="new-file">
+
testsuite/tests/saks/should_fail/T18863b.stderr
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</a>
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<li class="file-stats">
<a href="#65991711f90a1da50a63ac5fa76e420ef92b2a77">
testsuite/tests/saks/should_fail/all.T
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<li class="file-stats">
<a href="#82a47aff5f3476f4e6cfa1a934e5ddcb179588dc">
<span class="new-file">
+
testsuite/tests/typecheck/should_compile/T15079.hs
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</a>
</li>
<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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</ul>
<h4>Changes:</h4>
<li id="578c7c3857d66d963736ff6742f3433a0e8d01b7">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="485" 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="485" 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">@@ -485,6 +485,12 @@ Another helpful principle with eqType is this:</td>
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<td class="diff-line-num old_line" data-linenumber="485" 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">
485
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<td class="diff-line-num new_line" data-linenumber="485" 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">
485
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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This principle also tells us that eqType must relate only types with the</span></span>
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<td class="diff-line-num old_line" data-linenumber="486" 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">
486
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<td class="diff-line-num new_line" data-linenumber="486" 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">
486
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">same kinds.</span></span>
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487
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<td class="diff-line-num new_line" data-linenumber="487" 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">
487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"></span>
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<td class="diff-line-num new old_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="488" 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">
488
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Besides eqType, another equality relation that upholds the (EQ) property above</span></span>
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<td class="diff-line-num new old_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="489" 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">
489
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is /typechecker equality/, which is implemented as</span></span>
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<td class="diff-line-num new old_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="490" 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">
490
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Utils.TcType.tcEqType. See</span></span>
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<td class="diff-line-num new old_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="491" 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">
491
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Typechecker equality vs definitional equality] in GHC.Tc.Utils.TcType for</span></span>
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<td class="diff-line-num new old_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="492" 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">
492
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">what the difference between eqType and tcEqType is.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="493" 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">
493
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"></span>
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488
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<td class="diff-line-num new_line" data-linenumber="494" 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="LC494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Respecting definitional equality]</span></span>
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489
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<td class="diff-line-num new_line" data-linenumber="495" 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="LC495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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490
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<td class="diff-line-num new_line" data-linenumber="496" 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="LC496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Non-trivial definitional equality] introduces the property (EQ).</span></span>
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<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2236" 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="2236" 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">@@ -2236,7 +2236,7 @@ eqVarBndrs _ _ _= Nothing</td>
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2236
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2236
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<pre style="margin: 0;"> <span id="LC2236" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2237" 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">
2237
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<pre style="margin: 0;"> <span id="LC2237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2238
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<pre style="margin: 0;"> <span id="LC2238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [nonDetCmpType nondeterminism]</span></span>
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2239
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<td class="diff-line-num new_line old" data-linenumber="2239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2239
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<pre style="margin: 0;">+<span id="LC2239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~</span></span></span>
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2240
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2240
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<pre style="margin: 0;"> <span id="LC2240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nonDetCmpType is implemented in terms of nonDetCmpTypeX. nonDetCmpTypeX</span></span>
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2241
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2241
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<pre style="margin: 0;"> <span id="LC2241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">uses nonDetCmpTc which compares TyCons by their Unique value. Using Uniques for</span></span>
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2242
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2242
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<pre style="margin: 0;"> <span id="LC2242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ordering leads to nondeterminism. We hit the same problem in the TyVarTy case,</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">@@ -2926,7 +2926,7 @@ splitVisVarsOfTypes = foldMap splitVisVarsOfType</td>
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2926
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2926
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<pre style="margin: 0;"> <span id="LC2926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2927
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2927
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<pre style="margin: 0;"> <span id="LC2927" class="line" lang="haskell"></span>
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2928
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2928
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<pre style="margin: 0;"> <span id="LC2928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind Constraint and kind Type]</span></span>
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2929
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<pre style="margin: 0;">-<span id="LC2929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2929
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<pre style="margin: 0;">+<span id="LC2929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~</span></span></span>
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2930
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2930
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<pre style="margin: 0;"> <span id="LC2930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The kind Constraint is the kind of classes and other type constraints.</span></span>
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2931
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2931
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<pre style="margin: 0;"> <span id="LC2931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The special thing about types of kind Constraint is that</span></span>
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2932
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2932
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<pre style="margin: 0;"> <span id="LC2932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * They are displayed with double arrow:</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">@@ -2945,6 +2945,18 @@ generates an axiom witnessing</td>
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2945
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2945
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<pre style="margin: 0;"> <span id="LC2945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so on the left we have Constraint, and on the right we have Type.</span></span>
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2946
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2946
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<pre style="margin: 0;"> <span id="LC2946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See #7451.</span></span>
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2947
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2947
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<pre style="margin: 0;"> <span id="LC2947" class="line" lang="haskell"></span>
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2948
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<pre style="margin: 0;">+<span id="LC2948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because we treat Constraint/Type differently during and after type inference,</span></span>
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2949
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<pre style="margin: 0;">+<span id="LC2949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC has two notions of equality that differ in whether they equate</span></span>
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2950
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<pre style="margin: 0;">+<span id="LC2950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Constraint/Type or not:</span></span>
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2951
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<pre style="margin: 0;">+<span id="LC2951" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* GHC.Tc.Utils.TcType.tcEqType implements typechecker equality (see</span></span>
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<pre style="margin: 0;">+<span id="LC2953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Typechecker equality vs definitional equality] in GHC.Tc.Utils.TcType),</span></span>
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<pre style="margin: 0;">+<span id="LC2954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which treats Constraint and Type as distinct. This is used during type</span></span>
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<pre style="margin: 0;">+<span id="LC2955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inference. See #11715 for issues that arise from this.</span></span>
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<pre style="margin: 0;">+<span id="LC2956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* GHC.Core.TyCo.Rep.eqType implements definitional equality (see</span></span>
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<pre style="margin: 0;">+<span id="LC2957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Non-trivial definitional equality] in GHC.Core.TyCo.Rep), which treats</span></span>
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<pre style="margin: 0;">+<span id="LC2958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Constraint and Type as equal. This is used after type inference.</span></span>
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2959
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<pre style="margin: 0;">+<span id="LC2959" class="line" lang="haskell"></span>
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2960
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<pre style="margin: 0;"> <span id="LC2960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Bottom line: although 'Type' and 'Constraint' are distinct TyCons, with</span></span>
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2949
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2961
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<pre style="margin: 0;"> <span id="LC2961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">distinct uniques, they are treated as equal at all times except</span></span>
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2950
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2962
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<pre style="margin: 0;"> <span id="LC2962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">during type inference.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -1035,7 +1035,9 @@ can_eq_nc' _flat _rdr_env _envs ev eq_rel</td>
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canTyConApp</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span></span>
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1036
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"></span>
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1037
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"> <span class="n" style="color: #333;">s1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">s2</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"> <span class="n" style="color: #333;">s1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vis1</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"> <span class="n" style="color: #333;">s2</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">vis2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">vis1</span> <span class="p">`</span><span class="n" style="color: #333;">sameVis</span><span class="p">`</span> <span class="n" style="color: #333;">vis2</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [ForAllTy and typechecker equality]</span></span>
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1039
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">can_eq_nc_forall</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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1040
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"></span>
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1041
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Canonicalising type applications] about why we require flat types</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">@@ -1071,6 +1073,63 @@ If we have an unsolved equality like</td>
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1071
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that is not necessarily insoluble! Maybe 'a' will turn out to be a newtype.</span></span>
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1072
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we want to make it a potentially-soluble Irred not an insoluble one.</span></span>
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1073
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Missing this point is what caused #15431</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [ForAllTy and typechecker equality]</span></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Should GHC type-check the following program (adapted from #15740)?</span></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"></span>
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1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# LANGUAGE PolyKinds, ... #-}</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data D a</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F :: forall k. k -> Type</span></span>
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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F = D</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Due to the way F is declared, any instance of F must have a right-hand side</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">whose kind is equal to `forall k. k -> Type`. The kind of D is</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`forall {k}. k -> Type`, which is very close, but technically uses distinct</span></span>
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1089
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Core:</span></span>
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1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -----------------------------------------------------------</span></span>
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1092
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Source Haskell | Core |</span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -----------------------------------------------------------</span></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | forall k. <...> | ForAllTy (Bndr k Specified) (<...>) |</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | forall {k}. <...> | ForAllTy (Bndr k Inferred) (<...>) |</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -----------------------------------------------------------</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could deem these kinds to be unequal, but that would imply rejecting</span></span>
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1099
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">programs like the one above. Whether a kind variable binder ends up being</span></span>
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1100
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<pre style="margin: 0;">+<span id="LC1100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">specified or inferred can be somewhat subtle, however, especially for kinds</span></span>
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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that aren't explicitly written out in the source code (like in D above).</span></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For now, we decide to not make the specified/inferred status of an invisible</span></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type variable binder affect GHC's notion of typechecker equality</span></span>
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1104
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(see Note [Typechecker equality vs definitional equality] in</span></span>
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1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Utils.TcType). That is, we have the following:</span></span>
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1106
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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --------------------------------------------------</span></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Type 1 | Type 2 | Equal? |</span></span>
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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --------------------|-----------------------------</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | forall k. <...> | forall k. <...> | Yes |</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall {k}. <...> | Yes |</span></span>
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1112
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<pre style="margin: 0;">+<span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall k -> <...> | No |</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --------------------------------------------------</span></span>
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1114
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<pre style="margin: 0;">+<span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | forall {k}. <...> | forall k. <...> | Yes |</span></span>
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1115
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<pre style="margin: 0;">+<span id="LC1115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall {k}. <...> | Yes |</span></span>
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1116
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<pre style="margin: 0;">+<span id="LC1116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall k -> <...> | No |</span></span>
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1117
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<pre style="margin: 0;">+<span id="LC1117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --------------------------------------------------</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1118" 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">
1118
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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | forall k -> <...> | forall k. <...> | No |</span></span>
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1119
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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall {k}. <...> | No |</span></span>
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1120
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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | | forall k -> <...> | Yes |</span></span>
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1121
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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --------------------------------------------------</span></span>
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1122
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We implement this nuance by using the GHC.Types.Var.sameVis function in</span></span>
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1124
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Solver.Canonical.canEqNC and GHC.Tc.Utils.TcType.tcEqType, which</span></span>
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1125
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">respect typechecker equality. sameVis puts both forms of invisible type</span></span>
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1126
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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable binders into the same equivalence class.</span></span>
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1127
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<pre style="margin: 0;">+<span id="LC1127" class="line" lang="haskell"></span>
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1128
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we do /not/ use sameVis in GHC.Core.Type.eqType, which implements</span></span>
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1129
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/definitional/ equality, a slighty more coarse-grained notion of equality</span></span>
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1130
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(see Note [Non-trivial definitional equality] in GHC.Core.TyCo.Rep) that does</span></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not consider the ArgFlag of ForAllTys at all. That is, eqType would equate all</span></span>
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1132
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<pre style="margin: 0;">+<span id="LC1132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of forall k. <...>, forall {k}. <...>, and forall k -> <...>.</span></span>
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1074
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1075
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1134
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<pre style="margin: 0;"> <span id="LC1134" class="line" lang="haskell"></span>
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1076
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1135
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<pre style="margin: 0;"> <span id="LC1135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1506,9 +1506,8 @@ tcEqKind :: HasDebugCallStack => TcKind -> TcKind -> Bool</td>
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"><span class="n" style="color: #333;">tcEqKind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcEqType</span></span>
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1507
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"><span class="n" style="color: #333;">tcEqType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1509
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<pre style="margin: 0;">-<span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcEqType is a proper implements the same Note [Non-trivial definitional</span></span>
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1510
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<pre style="margin: 0;">-<span id="LC1510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equality] (in GHC.Core.TyCo.Rep) as `eqType`, but Type.eqType believes (* ==</span></span>
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1511
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Constraint), and that is NOT what we want in the type checker!</span></span>
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1509
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ tcEqType implements typechecker equality, as described in</span></span>
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1510
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @Note [Typechecker equality vs definitional equality]@.</span></span>
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1512
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1511
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"><span class="n" style="color: #333;">tcEqType</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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1513
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1512
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_eq_type</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ki1</span> <span class="n" style="color: #333;">ki2</span></span>
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1514
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1513
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">tc_eq_type</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</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">@@ -1557,7 +1556,9 @@ tc_eq_type keep_syns vis_only orig_ty1 orig_ty2</td>
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1557
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1556
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<pre style="margin: 0;"> <span id="LC1556" class="line" lang="haskell"></span>
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1558
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1557
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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">vis1</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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1559
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1558
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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv2</span> <span class="n" style="color: #333;">vis2</span><span class="p">)</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1560
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<pre style="margin: 0;">-<span id="LC1560" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vis1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">vis2</span></span>
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1559
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vis1</span> <span class="p">`</span><span class="n" style="color: #333;">sameVis</span><span class="p">`</span> <span class="n" style="color: #333;">vis2</span></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [ForAllTy and typechecker equality] in</span></span>
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<pre style="margin: 0;">+<span id="LC1561" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Solver.Canonical for why we use `sameVis` here</span></span>
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1561
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1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">vis_only</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tv2</span><span class="p">))</span></span>
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1562
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1563
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<pre style="margin: 0;"> <span id="LC1563" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">rnBndr2</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">tv2</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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1563
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1564
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<pre style="margin: 0;"> <span id="LC1564" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1623" 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">@@ -1622,6 +1623,29 @@ tc_eq_type keep_syns vis_only orig_ty1 orig_ty2</td>
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1622
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1623
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<pre style="margin: 0;"> <span id="LC1623" class="line" lang="haskell"> <span class="n" style="color: #333;">get_args</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1623
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1624
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"> <span class="n" style="color: #333;">eqFunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1624
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1625
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"></span>
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1626
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<pre style="margin: 0;">+<span id="LC1626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Typechecker equality vs definitional equality]</span></span>
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1627
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<pre style="margin: 0;">+<span id="LC1627" 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="LC1628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC has two notions of equality over Core types:</span></span>
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<pre style="margin: 0;">+<span id="LC1629" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Definitional equality, as implemented by GHC.Core.Type.eqType.</span></span>
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1631
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<pre style="margin: 0;">+<span id="LC1631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Non-trivial definitional equality] in GHC.Core.TyCo.Rep.</span></span>
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1632
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<pre style="margin: 0;">+<span id="LC1632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Typechecker equality, as implemented by tcEqType (in GHC.Tc.Utils.TcType).</span></span>
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1633
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<pre style="margin: 0;">+<span id="LC1633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Tc.Solver.Canonical.canEqNC also respects typechecker equality.</span></span>
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1634
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"></span>
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1635
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Typechecker equality implies definitional equality: if two types are equal</span></span>
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1636
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<pre style="margin: 0;">+<span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">according to typechecker equality, then they are also equal according to</span></span>
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1637
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<pre style="margin: 0;">+<span id="LC1637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">definitional equality. The converse is not always true, as typechecker equality</span></span>
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1638
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<pre style="margin: 0;">+<span id="LC1638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is more finer-grained than definitional equality in two places:</span></span>
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1639
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<pre style="margin: 0;">+<span id="LC1639" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Unlike definitional equality, which equates Type and Constraint, typechecker</span></span>
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1641
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> treats them as distinct types. See Note [Kind Constraint and kind Type] in</span></span>
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Core.Type.</span></span>
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<pre style="margin: 0;">+<span id="LC1643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Unlike definitional equality, which does not care about the ArgFlag of a</span></span>
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<pre style="margin: 0;">+<span id="LC1644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ForAllTy, typechecker equality treats Required type variable binders as</span></span>
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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> distinct from Invisible type variable binders.</span></span>
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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [ForAllTy and typechecker equality] in GHC.Tc.Solver.Canonical.</span></span>
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1647
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<pre style="margin: 0;">+<span id="LC1647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1648
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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1650
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1627
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1651
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Predicate types</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1321,7 +1321,7 @@ We expand synonyms during unification, but:</td>
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is particularly helpful when checking (* ~ *), because * is</span></span>
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> now a type synonym.</span></span>
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Deferred <span class="idiff left right">U</span>nification]</span></span>
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<pre style="margin: 0;">+<span id="LC1324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Deferred <span class="idiff left right">u</span>nification]</span></span>
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<pre style="margin: 0;"> <span id="LC1325" 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="LC1326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We may encounter a unification ty1 ~ ty2 that cannot be performed syntactically,</span></span>
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and yet its consistency is undetermined. Previously, there was no way to still</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#fa050e1532c92b2ffc94692d8b368f3fefa3196d"><strong>docs/users_guide/exts/poly_kinds.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">@@ -769,24 +769,6 @@ In this redefinition, we give an explicit kind for ``(:~~:)``, deferring the cho</td>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="plaintext">of ``k2`` until after the first argument (``a``) has been given. With this declaration</span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="plaintext">for ``(:~~:)``, the instance for ``HTestEquality`` is accepted.</span>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC772" class="line" lang="plaintext">Another difference between higher-rank kinds and types can be found in their</span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="plaintext">treatment of inferred and user-specified type variables. Consider the following</span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="plaintext">program: ::</span>
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<pre style="margin: 0;">-<span id="LC775" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC776" class="line" lang="plaintext"> newtype Foo (f :: forall k. k -> Type) = MkFoo (f Int)</span>
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="plaintext"> data Proxy a = Proxy</span>
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<pre style="margin: 0;">-<span id="LC778" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="plaintext"> foo :: Foo Proxy</span>
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<pre style="margin: 0;">-<span id="LC780" class="line" lang="plaintext"> foo = MkFoo Proxy</span>
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<pre style="margin: 0;">-<span id="LC781" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="plaintext">The kind of ``Foo``'s parameter is ``forall k. k -> Type``, but the kind of</span>
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<pre style="margin: 0;">-<span id="LC783" class="line" lang="plaintext">``Proxy`` is ``forall {k}. k -> Type``, where ``{k}`` denotes that the kind</span>
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<pre style="margin: 0;">-<span id="LC784" class="line" lang="plaintext">variable ``k`` is to be inferred, not specified by the user. (See</span>
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<pre style="margin: 0;">-<span id="LC785" class="line" lang="plaintext">:ref:`visible-type-application` for more discussion on the inferred-specified</span>
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="plaintext">distinction). GHC does not consider ``forall k. k -> Type`` and</span>
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787
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<pre style="margin: 0;">-<span id="LC787" class="line" lang="plaintext">``forall {k}. k -> Type`` to be equal at the kind level, and thus rejects</span>
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788
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<pre style="margin: 0;">-<span id="LC788" class="line" lang="plaintext">``Foo Proxy`` as ill-kinded.</span>
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789
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<pre style="margin: 0;">-<span id="LC789" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="plaintext">The kind ``Type``</span>
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791
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773
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="plaintext">-----------------</span>
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792
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774
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<pre style="margin: 0;"> <span id="LC774" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#8c04ae62547f5d5061b0b883fa187284074934e3"><strong>docs/users_guide/exts/type_applications.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">@@ -246,8 +246,7 @@ The braces are *not* allowed in the following places:</td>
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246
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="plaintext"> explicitly applied. Making them inferred (and thus not appliable) would be</span>
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247
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="plaintext"> conflicting.</span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="plaintext"></span>
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249
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="plaintext">- In default type signatures for class methods, in SPECIALISE pragmas or in</span>
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="plaintext"> instance declaration heads, e.g.::</span>
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="plaintext">- In SPECIALISE pragmas or in instance declaration heads, e.g.::</span>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="plaintext"> instance forall {a}. Eq (Maybe a) where ...</span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="plaintext"></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">@@ -256,3 +255,22 @@ The braces are *not* allowed in the following places:</td>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="plaintext"> could play a role.</span>
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256
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="plaintext">- On the left-hand sides of type declarations, such as classes, data types, etc.</span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="plaintext">Note that while specified and inferred type variables have different properties</span>
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<pre style="margin: 0;">+<span id="LC260" class="line" lang="plaintext">vis-à-vis visible type application, they do not otherwise affect GHC's notion</span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="plaintext">of equality over types. For example, given the following definitions: ::</span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="plaintext"> id1 :: forall a. a -> a</span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="plaintext"> id1 x = x</span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext"> id2 :: forall {a}. a -> a</span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext"> id2 x = x</span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="plaintext"></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="plaintext"> app1 :: (forall a. a -> a) -> b -> b</span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="plaintext"> app1 g x = g x</span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="plaintext"> app2 :: (forall {a}. a -> a) -> b -> b</span>
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273
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="plaintext"> app2 g x = g x</span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="plaintext">GHC will deem all of ``app1 id1``, ``app1 id2``, ``app2 id1``, and ``app2 id2``</span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="plaintext">to be well typed.</span></pre>
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<li id="4819f4fe8b315fee7a2e3da866dd282217505bba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#4819f4fe8b315fee7a2e3da866dd282217505bba"><strong>testsuite/tests/saks/should_fail/T18863a.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 PolyKinds #-}</span></span>
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2
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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 RankNTypes #-}</span></span>
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3
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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 StandaloneKindSignatures #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18863a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></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;">import</span> <span class="nn" style="color: #555;">Data.Kind</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;">type</span> <span class="kt" style="color: #458; font-weight: 600;">IDa</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IDa</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#2aa4d0077ed84ef50ebf5b951f2a4bbea2913052"><strong>testsuite/tests/saks/should_fail/T18863a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18863a.hs:9:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected kind: forall i. i -> *</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> with actual kind: forall i -> i -> *</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the data type declaration for ‘IDa’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#269dcd38c8abd7b01ba4d46aa175233a7180a070"><strong>testsuite/tests/saks/should_fail/T18863b.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 PolyKinds #-}</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 RankNTypes #-}</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 StandaloneKindSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18863b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" 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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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">IDb</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">i</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IDb</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#9fcff6eb387c837a6a25fa40cedcaecf7e24b20e"><strong>testsuite/tests/saks/should_fail/T18863b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18863b.hs:9:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected kind: forall i -> i -> *</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> with actual kind: i -> *</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the data type declaration for ‘IDb’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#65991711f90a1da50a63ac5fa76e420ef92b2a77"><strong>testsuite/tests/saks/should_fail/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">@@ -31,3 +31,5 @@ test('T16725', normal, compile_fail, [''])</td>
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31
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16826</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16756b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16758</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18863a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18863b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#82a47aff5f3476f4e6cfa1a934e5ddcb179588dc"><strong>testsuite/tests/typecheck/should_compile/T15079.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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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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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 TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T15079</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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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.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Type.Equality</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Eq</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Void</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Any</span><span class="p">)</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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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixl</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">:==</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="cd">-- | Heterogeneous Leibnizian equality.</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:==</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HRefl</span> <span class="p">{</span> <span class="n" style="color: #333;">hsubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">b</span> <span class="p">}</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" 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="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Coerce</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;">Coerce</span> <span class="p">{</span> <span class="n" style="color: #333;">uncoerce</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Starify</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Starify</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</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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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Starify</span> <span class="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;">Type</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Starify</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Void</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">coerce</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:==</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">coerce</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uncoerce</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">hsubst</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Coerce</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Flay</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">k</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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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Flay</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">unflay</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MassageKind</span> <span class="n" style="color: #333;">j</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Flay</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">MassageKind</span> <span class="p">(</span><span class="n" style="color: #333;">j</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MassageKind</span> <span class="n" style="color: #333;">j</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MassageKind</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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40
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="n" style="color: #333;">fromLeibniz</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">:==</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="o" style="font-weight: 600;">.:~:</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="n" style="color: #333;">fromLeibniz</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unflay</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsubst</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Flay</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Refl</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC44" 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="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="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;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</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;">Type</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkFoo</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">InferredProxy</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;">MkInferredProxy</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="kt" style="color: #458; font-weight: 600;">InferredProxy</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkFoo</span> <span class="kt" style="color: #458; font-weight: 600;">MkInferredProxy</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC52" 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="LC53" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="n" style="color: #333;">id1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="n" style="color: #333;">id1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="n" style="color: #333;">id2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">{</span><span class="n" style="color: #333;">a</span><span class="p">}</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="n" style="color: #333;">id2</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="n" style="color: #333;">app1</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="n" style="color: #333;">app1</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="n" style="color: #333;">app2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="p">{</span><span class="n" style="color: #333;">a</span><span class="p">}</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="n" style="color: #333;">app2</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57c3db9612463426e1724816fd3f98142fec0e31#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">@@ -627,6 +627,7 @@ test('SplitWD', normal, compile, [''])</td>
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627
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># (2) Build the program twice: once with -dynamic, and then</span></span>
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628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># with -prof using -osuf to set a different object file suffix.</span></span>
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629
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14441</span><span class="p">',</span> <span class="nv" style="color: #008080;">omit_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">profasm</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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630
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15079</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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630
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631
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15050</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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631
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14735</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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632
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633
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15180</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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