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<h3>
Ryan Scott pushed to branch wip/T18240
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/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7">15bfa78c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-11T22:04:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject nested foralls/contexts in instance types more consistently
GHC is very wishy-washy about rejecting instance declarations with
nested `forall`s or contexts that are surrounded by outermost
parentheses. This can even lead to some strange interactions with
`ScopedTypeVariables`, as demonstrated in #18240. This patch makes
GHC more consistently reject instance types with nested
`forall`s/contexts so as to prevent these strange interactions.
On the implementation side, this patch tweaks `splitLHsInstDeclTy`
and `getLHsInstDeclHead` to not look through parentheses, which can
be semantically significant. I've added a
`Note [No nested foralls or contexts in instance types]` in
`GHC.Hs.Type` to explain why. This also introduces a
`no_nested_foralls_contexts_err` function in `GHC.Rename.HsType` to
catch nested `forall`s/contexts in instance types. This function is
now used in `rnClsInstDecl` (for ordinary instance declarations) and
`rnSrcDerivDecl` (for standalone `deriving` declarations), the latter
of which fixes #18271.
On the documentation side, this adds a new
"Formal syntax for instance declaration types" section to the GHC
User's Guide that presents a BNF-style grammar for what is and isn't
allowed in instance types.
Fixes #18240. Fixes #18271.
</pre>
</li>
</ul>
<h4>23 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
</a>
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<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
</a>
</li>
<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
</a>
</li>
<li class="file-stats">
<a href="#afd1105d8e32dc50acf9fc381b4433a3bcd009cf">
docs/users_guide/exts/explicit_forall.rst
</a>
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<li class="file-stats">
<a href="#ed75822e0b6142f196a6abeb623c7669d31b4711">
docs/users_guide/exts/instances.rst
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<li class="file-stats">
<a href="#aa2301674e0cbbe7c768058a6ef910ddc4fae0a0">
docs/users_guide/exts/scoped_type_variables.rst
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<li class="file-stats">
<a href="#93c64333f070b164541735b51a8744759d526b14">
testsuite/tests/dependent/should_fail/T16326_Fail8.stderr
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<li class="file-stats">
<a href="#f92307abf65d8bac17d3db9c233257096f38b948">
<span class="new-file">
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testsuite/tests/dependent/should_fail/T18271.hs
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<li class="file-stats">
<a href="#c8d328bc3317561862c3672be6d12dce45ebd21d">
<span class="new-file">
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testsuite/tests/dependent/should_fail/T18271.stderr
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</a>
</li>
<li class="file-stats">
<a href="#ff9e00d3839a68830e26f2566987483d69b42545">
testsuite/tests/dependent/should_fail/all.T
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<li class="file-stats">
<a href="#acb406a2f9ac5f8c9d59f7fc273c23a554dc7ee6">
testsuite/tests/deriving/should_compile/T15831.hs
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<li class="file-stats">
<a href="#4c47c71bbf8ac336c7814f01eee1ef414a1e876c">
testsuite/tests/deriving/should_compile/deriving-via-standalone.hs
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<li class="file-stats">
<a href="#5df5554417242788fa4a53d83e05a5101bae7853">
testsuite/tests/deriving/should_fail/deriving-via-fail.hs
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<li class="file-stats">
<a href="#4db3d282e03001f5056ab13042451e8ecc93641d">
testsuite/tests/deriving/should_fail/deriving-via-fail4.hs
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<li class="file-stats">
<a href="#b63e9618517f0d9b41caa8adff37da787487a740">
testsuite/tests/parser/should_fail/T3811c.stderr
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<li class="file-stats">
<a href="#be905d068488b64580a9e32a37d73cb5121c444b">
testsuite/tests/rename/should_fail/T16114.stderr
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<li class="file-stats">
<a href="#96a6318e3a0dc35a75c7af4ef268cc42c2c5cf4c">
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testsuite/tests/rename/should_fail/T18240a.hs
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testsuite/tests/rename/should_fail/T18240a.stderr
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<li class="file-stats">
<a href="#034068f58f4d584425f2837a71a02e7e40490975">
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testsuite/tests/rename/should_fail/T18240b.hs
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<a href="#4c136fc4373e90782cb2edc4ec02558397657be8">
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testsuite/tests/rename/should_fail/T18240b.stderr
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<a href="#ee37751d799a602d239c6ebe3b4f3ff3666385e3">
testsuite/tests/rename/should_fail/T5951.stderr
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<li class="file-stats">
<a href="#c2554d4efde41e6e193f728122336449d2cb5fc5">
testsuite/tests/rename/should_fail/all.T
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<li class="file-stats">
<a href="#1e6f7fe82ba2b06a45e4a33efaa12da5df7237cb">
testsuite/tests/typecheck/should_fail/T16394.stderr
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<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="58" 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">@@ -58,7 +58,7 @@ module GHC.Hs.Type (</td>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarLocName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExplicitLTyVarNames</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="59" 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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<td class="diff-line-num new_line" data-linenumber="59" 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="LC59" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsInstDeclTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getLHsInstDeclHead</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getLHsInstDeclClass_maybe</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="60" 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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<td class="diff-line-num new_line" data-linenumber="60" 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="LC60" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsPatSynTy</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="61" 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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<td class="diff-line-num new_line old" data-linenumber="61" 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="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsForAllTyInvis</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitLHsQualTy</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsForAllTyInvis</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitLHs<span class="idiff left">ForAllTyInvis_KP</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">splitLHs</span>QualTy</span><span class="p">,</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitLHsSigmaTyInvis</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitLHsGADTPrefixTy</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="63" 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="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitHsFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsTyGetAppHead_maybe</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="64" 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="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsOpTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsAppKindTy</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="93" 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="93" 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">@@ -93,10 +93,10 @@ import GHC.Types.Basic</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span><span class="p">(</span> <span class="n" style="color: #333;">isJust</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">count</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Data</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Fixity</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Prefix</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Infix</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC101" 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="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1257,10 +1257,10 @@ splitHsFunType (L _ (HsFunTy _ x y))</td>
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<pre style="margin: 0;"> <span id="LC1257" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"><span class="n" style="color: #333;">splitHsFunType</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">other</span><span class="p">)</span></span>
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1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1260" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">retrieve the name of the "head" of a nested type application</span></span></span>
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<pre style="margin: 0;">-<span id="LC1261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">somewhat like splitHsAppTys, but a little more thorough</span></span></span>
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<pre style="margin: 0;">-<span id="LC1262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">used to examine the result of a GADT-like datacon, so it doesn't handle</span></span></span>
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<pre style="margin: 0;">-<span id="LC1263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">*all* cases (like lists, tuples, (~), etc.)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1260" class="line" lang="haskell"><span class="cd">-- <span class="idiff left right">| Retrieve the name of the \"head\" of a nested type application.</span></span></span>
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<pre style="margin: 0;">+<span id="LC1261" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">This is somewhat like @GHC.Tc.Gen.HsType.splitHsAppTys@, but a little more</span></span></span>
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<pre style="margin: 0;">+<span id="LC1262" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">thorough. The purpose of this function is to examine instance heads, so it</span></span></span>
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<pre style="margin: 0;">+<span id="LC1263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">doesn't handle *all* cases (like lists, tuples, @(~)@, etc.).</span></span></span>
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"><span class="n" style="color: #333;">hsTyGetAppHead_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"><span class="n" style="color: #333;">hsTyGetAppHead_maybe</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</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">@@ -1356,6 +1356,26 @@ splitLHsSigmaTyInvis ty</td>
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsQualTy</span> <span class="n" style="color: #333;">ty1</span></span>
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1357
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1357
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<pre style="margin: 0;"> <span id="LC1357" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1358
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1358
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<pre style="margin: 0;"> <span id="LC1358" class="line" lang="haskell"></span>
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1359
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<pre style="margin: 0;">+<span id="LC1359" class="line" lang="haskell"><span class="cd">-- | Decompose a sigma type (of the form @forall <tvs>. context => body@)</span></span>
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1360
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<pre style="margin: 0;">+<span id="LC1360" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- into its constituent parts.</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Only splits type variable binders that were</span></span>
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1362
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<pre style="margin: 0;">+<span id="LC1362" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- quantified invisibly (e.g., @forall a.@, with a dot).</span></span>
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1363
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<pre style="margin: 0;">+<span id="LC1363" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1364
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<pre style="margin: 0;">+<span id="LC1364" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function is used to split apart certain types, such as instance</span></span>
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1365
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration types, which disallow visible @forall@s. For instance, if GHC</span></span>
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1366
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<pre style="margin: 0;">+<span id="LC1366" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- split apart the @forall@ in @instance forall a -> Show (Blah a)@, then that</span></span>
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1367
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration would mistakenly be accepted!</span></span>
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1368
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1369
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unlike 'splitLHsSigmaTyInvis', this function does not look through</span></span>
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1370
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parentheses, hence the suffix @_KP@ (short for \"Keep Parentheses\").</span></span>
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1371
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsSigmaTyInvis_KP</span> <span class="o" style="font-weight: 600;">::</span></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span></span>
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1373
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="n" style="color: #333;">pass</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1374
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsSigmaTyInvis_KP</span> <span class="n" style="color: #333;">ty</span></span>
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1375
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsForAllTyInvis_KP</span> <span class="n" style="color: #333;">ty</span></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsQualTy_KP</span> <span class="n" style="color: #333;">ty1</span></span>
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1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1378
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<pre style="margin: 0;">+<span id="LC1378" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"><span class="cd">-- | Decompose a prefix GADT type into its constituent parts.</span></span>
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns @(mb_tvbs, mb_ctxt, body)@, where:</span></span>
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1381
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<pre style="margin: 0;"> <span id="LC1381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1373,25 +1393,7 @@ splitLHsSigmaTyInvis ty</td>
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1373
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsGADTPrefixTy</span> <span class="o" style="font-weight: 600;">::</span></span>
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1374
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span></span>
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1375
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="n" style="color: #333;">pass</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1376
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<pre style="margin: 0;">-<span id="LC1376" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsGADTPrefixTy</span> <span class="n" style="color: #333;">ty</span></span>
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1377
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<pre style="margin: 0;">-<span id="LC1377" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">split_forall</span> <span class="n" style="color: #333;">ty</span></span>
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1378
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<pre style="margin: 0;">-<span id="LC1378" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">split_ctxt</span> <span class="n" style="color: #333;">rho</span></span>
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1379
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<pre style="margin: 0;">-<span id="LC1379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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1380
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<pre style="margin: 0;">-<span id="LC1380" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1381
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<pre style="margin: 0;">-<span id="LC1381" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: We do not use splitLHsForAllTyInvis below, since that looks through</span></span>
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1382
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<pre style="margin: 0;">-<span id="LC1382" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parentheses...</span></span>
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1383
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<pre style="margin: 0;">-<span id="LC1383" class="line" lang="haskell"> <span class="n" style="color: #333;">split_forall</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span><span class="p">,</span> <span class="n" style="color: #333;">hst_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bndrs</span></span>
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1384
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<pre style="margin: 0;">-<span id="LC1384" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rho</span> <span class="p">}))</span></span>
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1385
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<pre style="margin: 0;">-<span id="LC1385" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>
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1386
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<pre style="margin: 0;">-<span id="LC1386" class="line" lang="haskell"> <span class="n" style="color: #333;">split_forall</span> <span class="n" style="color: #333;">sigma</span></span>
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1387
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<pre style="margin: 0;">-<span id="LC1387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">sigma</span><span class="p">)</span></span>
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1388
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<pre style="margin: 0;">-<span id="LC1388" class="line" lang="haskell"></span>
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1389
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<pre style="margin: 0;">-<span id="LC1389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...similarly, we do not use splitLHsQualTy below, since that also looks</span></span>
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1390
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<pre style="margin: 0;">-<span id="LC1390" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- through parentheses.</span></span>
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"> <span class="n" style="color: #333;">split_ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tau</span> <span class="p">}))</span></span>
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1392
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<pre style="margin: 0;">-<span id="LC1392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1393" class="line" lang="haskell"> <span class="n" style="color: #333;">split_ctxt</span> <span class="n" style="color: #333;">tau</span></span>
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1394
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<pre style="margin: 0;">-<span id="LC1394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsGADTPrefixTy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis_KP</span></span>
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1397
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"><span class="cd">-- | Decompose a type of the form @forall <tvs>. body@ into its constituent</span></span>
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parts. Only splits type variable binders that</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">@@ -1406,14 +1408,33 @@ splitLHsGADTPrefixTy ty</td>
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- such as @(forall a. <...>)@. The downside to this is that it is not</span></span>
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1407
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- generally possible to take the returned types and reconstruct the original</span></span>
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type (parentheses and all) from them.</span></span>
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<pre style="margin: 0;">-<span id="LC1409" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">lty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unlike 'splitLHsSigmaTyInvis', this function does not look through</span></span>
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parentheses, hence the suffix @_KP@ (short for \"Keep Parentheses\").</span></span>
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<pre style="margin: 0;">+<span id="LC1413" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">+<span id="LC1414" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">ty</span></span>
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1416
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<pre style="margin: 0;">+<span id="LC1416" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsForAllTyInvis_KP</span> <span class="p">(</span><span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">mb_tvbs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1418
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"></span>
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1419
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<pre style="margin: 0;">+<span id="LC1419" class="line" lang="haskell"><span class="cd">-- | Decompose a type of the form @forall <tvs>. body@ into its constituent</span></span>
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1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parts. Only splits type variable binders that</span></span>
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1421
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- were quantified invisibly (e.g., @forall a.@, with a dot).</span></span>
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1422
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<pre style="margin: 0;">+<span id="LC1422" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function is used to split apart certain types, such as instance</span></span>
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1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration types, which disallow visible @forall@s. For instance, if GHC</span></span>
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1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- split apart the @forall@ in @instance forall a -> Show (Blah a)@, then that</span></span>
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1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- declaration would mistakenly be accepted!</span></span>
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1427
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<pre style="margin: 0;">+<span id="LC1427" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unlike 'splitLHsForAllTyInvis', this function does not look through</span></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parentheses, hence the suffix @_KP@ (short for \"Keep Parentheses\").</span></span>
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1430
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<pre style="margin: 0;">+<span id="LC1430" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis_KP</span> <span class="o" style="font-weight: 600;">::</span></span>
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1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LHsTyVarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span> <span class="n" style="color: #333;">pass</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsForAllTyInvis_KP</span> <span class="n" style="color: #333;">lty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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1411
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1433
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<pre style="margin: 0;"> <span id="LC1433" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">splitLHsForAllTyInvis</span> <span class="n" style="color: #333;">ty'</span></span>
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1413
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvf'</span><span class="p">,</span> <span class="n" style="color: #333;">hst_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs'</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body'</span> <span class="p">}</span></span>
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1414
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fvf'</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">tvs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span></span>
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1416
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">[]</span></span><span class="p">,</span> <span class="n" style="color: #333;">lty</span><span class="p">)</span></span>
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1436
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<pre style="margin: 0;">+<span id="LC1436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">tvs'</span><span class="p">,</span> <span class="n" style="color: #333;">body'</span><span class="p">)</span></span>
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1437
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Nothing</span></span><span class="p">,</span> <span class="n" style="color: #333;">lty</span><span class="p">)</span></span>
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1417
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1438
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"></span>
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1418
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1439
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"><span class="cd">-- | Decompose a type of the form @context => body@ into its constituent parts.</span></span>
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1419
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1440
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1422,40 +1443,136 @@ splitLHsForAllTyInvis lty@(L _ ty) =</td>
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1422
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- generally possible to take the returned types and reconstruct the original</span></span>
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1423
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type (parentheses and all) from them.</span></span>
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1424
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1445
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<pre style="margin: 0;"> <span id="LC1445" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="n" style="color: #333;">pass</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitLHsQualTy</span> <span class="n" style="color: #333;">ty</span></span>
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1426
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body</span> <span class="p">}))</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">noLHsContext</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1446
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<pre style="margin: 0;">+<span id="LC1446" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy</span> <span class="n" style="color: #333;">ty</span></span>
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1447
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<pre style="margin: 0;">+<span id="LC1447" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsQualTy_KP</span> <span class="p">(</span><span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1448" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">noLHsContext</span> <span class="n" style="color: #333;">mb_ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1449
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<pre style="margin: 0;">+<span id="LC1449" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cd">-- | Decompose a type of the form @context => body@ into its constituent parts.</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" 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="LC1452" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unlike 'splitLHsQualTy', this function does not look through</span></span>
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- parentheses, hence the suffix @_KP@ (short for \"Keep Parentheses\").</span></span>
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy_KP</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="n" style="color: #333;">pass</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="n" style="color: #333;">pass</span><span class="p">)</span></span>
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1455
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy_KP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">hst_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body</span> <span class="p">}))</span></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsQualTy_KP</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>
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1428
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1458
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"></span>
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1429
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1459
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"><span class="cd">-- | Decompose a type class instance type (of the form</span></span>
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1430
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1460
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<pre style="margin: 0;"> <span id="LC1460" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall <tvs>. context => instance_head@) into its constituent parts.</span></span>
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1461
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<pre style="margin: 0;">+<span id="LC1461" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that the @[Name]@s returned correspond to either:</span></span>
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1431
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1462
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1432
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that this function looks through parentheses, so it will work on types</span></span>
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1433
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<pre style="margin: 0;">-<span id="LC1433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- such as @(forall <tvs>. <...>)@. The downside to this is that it is not</span></span>
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1434
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<pre style="margin: 0;">-<span id="LC1434" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- generally possible to take the returned types and reconstruct the original</span></span>
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1435
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<pre style="margin: 0;">-<span id="LC1435" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type (parentheses and all) from them.</span></span>
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1463
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<pre style="margin: 0;">+<span id="LC1463" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The implicitly bound type variables (if the type lacks an outermost</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall@), or</span></span>
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1465
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<pre style="margin: 0;">+<span id="LC1465" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1466
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<pre style="margin: 0;">+<span id="LC1466" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * The explicitly bound type variables (if the type has an outermost</span></span>
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1467
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall@).</span></span>
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1468
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<pre style="margin: 0;">+<span id="LC1468" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1469
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function is careful not to look through parentheses.</span></span>
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1470
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<pre style="margin: 0;">+<span id="LC1470" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [No nested foralls or contexts in instance types]@</span></span>
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1471
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<pre style="margin: 0;">+<span id="LC1471" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- for why this is important.</span></span>
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1436
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1472
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<pre style="margin: 0;"> <span id="LC1472" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsInstDeclTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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1437
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1473
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<pre style="margin: 0;"> <span id="LC1473" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1438" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Split up an instance decl type, returning the pieces</span></span>
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1439
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<pre style="margin: 0;"> <span id="LC1474" class="line" lang="haskell"><span class="n" style="color: #333;">splitLHsInstDeclTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">itkvs</span></span>
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1440
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1475
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<pre style="margin: 0;"> <span id="LC1475" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inst_ty</span> <span class="p">})</span></span>
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1441
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<pre style="margin: 0;">-<span id="LC1441" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">body_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis</span> <span class="n" style="color: #333;">inst_ty</span></span>
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1442
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<pre style="margin: 0;">-<span id="LC1442" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">itkvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">cxt</span><span class="p">,</span> <span class="n" style="color: #333;">body_ty</span><span class="p">)</span></span>
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1443
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<pre style="margin: 0;">-<span id="LC1443" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Return implicitly bound type and kind vars</span></span>
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1444
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<pre style="margin: 0;">-<span id="LC1444" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For an instance decl, all of them are in scope</span></span>
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1476
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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">mb_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">body_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitLHsSigmaTyInvis_KP</span> <span class="n" style="color: #333;">inst_ty</span></span>
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1477
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<pre style="margin: 0;">+<span id="LC1477" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">itkvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">maybe</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">mb_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="n" style="color: #333;">noLHsContext</span> <span class="n" style="color: #333;">mb_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">body_ty</span><span class="p">)</span></span>
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1478
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<pre style="margin: 0;">+<span id="LC1478" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Because of the forall-or-nothing rule (see Note [forall-or-nothing rule]</span></span>
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1479
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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Rename.HsType), at least one of itkvs (the implicitly bound type</span></span>
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1480
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variables) or mb_tvs (the explicitly bound type variables) will be</span></span>
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1481
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- empty. Still, if ScopedTypeVariables is enabled, we must bring one or</span></span>
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1482
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the other into scope over the bodies of the instance methods, so we</span></span>
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1483
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- simply combine them into a single list.</span></span>
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1445
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1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"><span class="cd">-- | Decompose a type class instance type (of the form</span></span>
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1486
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall <tvs>. context => instance_head@) into the @instance_head@.</span></span>
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1446
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1487
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1447" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;"><span class="idiff left right">inst_ty</span></span></span>
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1448
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<pre style="margin: 0;">-<span id="LC1448" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">_<span class="idiff left">tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_cxt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">body_ty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitLHsSigmaTyInvis</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">hsSigType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inst_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">HsIB</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">hsib_body</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inst_ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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1489
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<pre style="margin: 0;">+<span id="LC1489" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">_<span class="idiff left">mb_tvs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">_mb_cxt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">body_ty</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">splitLHsSigmaTyInvis_KP</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">inst_ty</span></span></span>
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1449
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body_ty</span></span>
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1450
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"></span>
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1492
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<pre style="margin: 0;">+<span id="LC1492" class="line" lang="haskell"><span class="cd">-- | Decompose a type class instance type (of the form</span></span>
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1493
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<pre style="margin: 0;">+<span id="LC1493" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @forall <tvs>. context => instance_head@) into the @instance_head@ and</span></span>
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1494
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<pre style="margin: 0;">+<span id="LC1494" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- retrieve the underlying class type constructor (if it exists).</span></span>
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1451
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1495
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsInstDeclClass_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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1452
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1496
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdP</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)))</span></span>
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1453
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Works on (<span class="idiff left right">HsSigType RdrName</span>)</span></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Works on (<span class="idiff left right">LHsSigType GhcPs</span>)</span></span>
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1454
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1498
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsInstDeclClass_maybe</span> <span class="n" style="color: #333;">inst_ty</span></span>
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1455
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1499
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<pre style="margin: 0;"> <span id="LC1499" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">head_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;">inst_ty</span></span>
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1456
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1500
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<pre style="margin: 0;"> <span id="LC1500" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">hsTyGetAppHead_maybe</span> <span class="n" style="color: #333;">head_ty</span></span>
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1457
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1501
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<pre style="margin: 0;"> <span id="LC1501" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">cls</span> <span class="p">}</span></span>
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1458
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1502
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<pre style="margin: 0;"> <span id="LC1502" class="line" lang="haskell"></span>
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1503
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<pre style="margin: 0;">+<span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No nested foralls or contexts in instance types]</span></span>
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1505
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<pre style="margin: 0;">+<span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1506
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The type at the top of an instance declaration is one of the few places in GHC</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1507" 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">
1507
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<pre style="margin: 0;">+<span id="LC1507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where nested `forall`s or contexts are not permitted, even with RankNTypes</span></span>
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1508
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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">enabled. For example, the following will be rejected:</span></span>
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1509
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"></span>
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1510
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall a. forall b. Show (Either a b) where ...</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1511" 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">
1511
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Eq a => Eq b => Show (Either a b) where ...</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1512" 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">
1512
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance (forall a. Show (Maybe a)) where ...</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1513" 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">
1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance (Eq a => Show (Maybe a)) where ...</span></span>
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1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1515" 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">
1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This restriction is partly motivated by an unusual quirk of instance</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">declarations. Namely, if ScopedTypeVariables is enabled, then the type</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1517" 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">
1517
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables from the top of an instance will scope over the bodies of the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1518" 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">
1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance methods, /even if the type variables are implicitly quantified/.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1519" 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">
1519
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<pre style="margin: 0;">+<span id="LC1519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example, GHC will accept the following:</span></span>
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1520
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1521" 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">
1521
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Monoid a => Monoid (Identity a) where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1522" 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">
1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mempty = Identity (mempty @a)</span></span>
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1523
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1524" 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">
1524
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Moreover, the type in the top of an instance declaration must obey the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1525" 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">
1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">forall-or-nothing rule (see Note [forall-or-nothing rule] in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Rename.HsType). If instance types allowed nested `forall`s, this could</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1527" 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">
1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">result in some strange interactions. For example, consider the following:</span></span>
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1528
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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"></span>
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1529
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m :: Proxy a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1531" 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">
1531
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance (forall a. C (Either a b)) where</span></span>
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1532
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> m = Proxy @(Either a b)</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"></span>
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1534
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Somewhat surprisingly, old versions of GHC would accept the instance above.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1535" 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">
1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though the `forall` only quantifies `a`, the outermost parentheses mean</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the `forall` is nested, and per the forall-or-nothing rule, this means</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1537" 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">
1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that implicit quantification would occur. Therefore, the `a` is explicitly</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound and the `b` is implicitly bound. Moreover, ScopedTypeVariables would</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bring /both/ sorts of type variables into scope over the body of `m`.</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How utterly confusing!</span></span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"></span>
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1542
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To avoid this sort of confusion, we simply disallow nested `forall`s in</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance types, which makes things like the instance above become illegal.</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the sake of consistency, we also disallow nested contexts, even though they</span></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">don't have the same strange interaction with ScopedTypeVariables.</span></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-----</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- Wrinkle: Derived instances</span></span>
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1549
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-----</span></span>
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1550
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"></span>
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1551
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Just as GHC forbids nested `forall`s in the top of instance declarations, it</span></span>
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1552
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">also forbids them in types involved with `deriving`:</span></span>
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1553
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<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"></span>
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1554
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<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. In the `via` types in DerivingVia. For example, this is rejected:</span></span>
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1555
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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"></span>
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1556
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving via (forall x. V x) instance C (S x)</span></span>
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1557
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"></span>
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1558
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just like the types in instance declarations, `via` types can also bring</span></span>
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1559
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> both implicitly and explicitly bound type variables into scope. As a result,</span></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we adopt the same no-nested-`forall`s rule in `via` types to avoid confusing</span></span>
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1561
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<pre style="margin: 0;">+<span id="LC1561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> behavior like in the example below:</span></span>
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1562
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"></span>
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1563
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> deriving via (forall x. T x y) instance W x y (Foo a b)</span></span>
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1564
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Both x and y are brought into scope???</span></span>
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1565
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. In the classes in `deriving` clauses. For example, this is rejected:</span></span>
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1566
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<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT deriving (C1, (forall x. C2 x y))</span></span>
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1568
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"></span>
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1569
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is because the generated instance would look like:</span></span>
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1570
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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"></span>
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1571
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall x y. C2 x y T where ...</span></span>
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1572
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So really, the same concerns as instance declarations apply here as well.</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1575
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"></span>
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1459
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1460
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1577
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1461
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1578
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.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">@@ -65,6 +65,7 @@ import GHC.Data.List.SetOps ( findDupsEq, removeDups, equivClasses )</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Graph.Directed</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">SCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flattenSCCs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Node</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">stronglyConnCompFromEdgedVerticesUniq</span> <span class="p">)</span></span>
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">whenIsJust</span> <span class="p">)</span></span>
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68
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.OrdList</span></span>
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69
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70
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<pre style="margin: 0;"> <span id="LC70" 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;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></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">@@ -601,27 +602,43 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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601
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uprags</span><span class="p">,</span> <span class="n" style="color: #333;">cid_tyfam_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ats</span></span>
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602
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_overlap_mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oflag</span></span>
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603
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604
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cid_datafam_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">adts</span> <span class="p">})</span></span>
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604
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">inst_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">inst_fvs</span><span class="p">)</span></span>
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605
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an instance declaration"</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">inst_ty</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">inst_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">inst_fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">inst_ty</span></span>
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606
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606
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">ktv_names</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">head_ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitLHsInstDeclTy</span> <span class="n" style="color: #333;">inst_ty'</span></span>
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607
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span></span>
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608
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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hsTyGetAppHead_maybe</span> <span class="n" style="color: #333;">head_ty'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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609
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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">cls</span></span>
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610
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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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611
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The instance is malformed. We'd still like</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to make *some* progress (rather than failing outright), so</span></span>
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613
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we report an error and continue for as long as we can.</span></span>
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614
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<pre style="margin: 0;">-<span id="LC614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Importantly, this error should be thrown before we reach the</span></span>
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615
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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- typechecker, lest we encounter different errors that are</span></span>
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616
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<pre style="margin: 0;">-<span id="LC616" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hopelessly confusing (such as the one in #16114).</span></span>
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617
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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">inst_ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>
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618
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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal class instance:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inst_ty</span><span class="p">))</span></span>
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619
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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Class instances must be of the form"</span></span>
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620
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"context => C ty_1 ... ty_n"</span></span>
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621
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'C'</span><span class="p">)</span></span>
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622
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is a class"</span></span>
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623
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"> <span class="p">])</span></span>
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624
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkUnboundName</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"<class>"</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s or contexts, which are</span></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- illegal in the type of an instance declaration (see</span></span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in instance types] in</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Hs.Type)...</span></span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_nested_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Instance head"</span><span class="p">)</span> <span class="n" style="color: #333;">head_ty'</span></span>
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613
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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...then check if the instance head is actually headed by a</span></span>
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614
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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- class type constructor...</span></span>
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615
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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"> <span class="n" style="color: #333;">eith_cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">hsTyGetAppHead_maybe</span> <span class="n" style="color: #333;">head_ty'</span> <span class="kr" style="font-weight: 600;">of</span></span>
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616
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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">cls</span></span>
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617
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Left</span></span>
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618
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"> <span class="p">(</span> <span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">head_ty'</span></span>
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619
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal head of an instance declaration:"</span></span>
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620
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">head_ty'</span><span class="p">))</span></span>
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621
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Instance heads must be of the form"</span></span>
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622
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">nest</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"C ty_1 ... ty_n"</span></span>
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623
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"where"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'C'</span><span class="p">)</span></span>
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624
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is a class"</span></span>
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625
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"> <span class="p">])</span></span>
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626
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"> <span class="p">)</span></span>
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627
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...finally, attempt to retrieve the class type constructor, failing</span></span>
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628
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with an error message if there isn't one. To avoid excessive</span></span>
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629
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- amounts of error messages, we will only report one of the errors</span></span>
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630
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from mb_nested_msg or eith_cls at a time.</span></span>
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631
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">maybe</span> <span class="n" style="color: #333;">eith_cls</span> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">mb_nested_msg</span> <span class="kr" style="font-weight: 600;">of</span></span>
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632
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">cls</span></span>
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633
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The instance is malformed. We'd still like</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to make *some* progress (rather than failing outright), so</span></span>
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636
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we report an error and continue for as long as we can.</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Importantly, this error should be thrown before we reach the</span></span>
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- typechecker, lest we encounter different errors that are</span></span>
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hopelessly confusing (such as the one in #16114).</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkUnboundName</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcOccFS</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"<class>"</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC642" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Rename the bindings</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The typechecker (not the renamer) checks that all</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">@@ -660,6 +677,7 @@ rnClsInstDecl (ClsInstDecl { cid_poly_ty = inst_ty, cid_binds = mbinds</td>
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- strange, but should not matter (and it would be more work</span></span>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to remove the context).</span></span>
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679
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">GenericCtx</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"an instance declaration"</span></span>
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_err</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">rnFamInstEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1011" 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">@@ -993,11 +1011,19 @@ rnSrcDerivDecl (DerivDecl _ ty mds overlap)</td>
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">standalone_deriv_ok</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">StandaloneDeriving</span></span>
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">standalone_deriv_ok</span> <span class="p">(</span><span class="n" style="color: #333;">addErr</span> <span class="n" style="color: #333;">standaloneDerivErr</span><span class="p">)</span></span>
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">mds'</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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996
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<pre style="margin: 0;">-<span id="LC996" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="n" style="color: #333;">mds</span> <span class="o" style="font-weight: 600;">$</span></span>
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997
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">mds</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">rnHsSigWcType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">ty</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s or contexts, which are</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- illegal in the type of an instance declaration (see</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [No nested foralls or contexts in instance types] in</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Hs.Type).</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Standalone-derived instance head"</span><span class="p">)</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">ty'</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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998
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnNoDerivStrat</span> <span class="n" style="color: #333;">mds'</span> <span class="n" style="color: #333;">loc</span></span>
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999
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DerivDecl</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">mds'</span> <span class="n" style="color: #333;">overlap</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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1000
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DerivDeclCtx</span></span>
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1001
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_err</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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1002
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hswc_body</span> <span class="n" style="color: #333;">ty</span></span>
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1003
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"></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">@@ -1805,14 +1831,26 @@ rnLHsDerivingClause doc</td>
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1805
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1831
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_clause_strategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dcs</span></span>
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1806
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1832
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<pre style="margin: 0;"> <span id="LC1832" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_clause_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">dct</span> <span class="p">}))</span></span>
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1807
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1833
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">dcs'</span><span class="p">,</span> <span class="n" style="color: #333;">dct'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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1808
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<pre style="margin: 0;">-<span id="LC1808" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">dcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mapFvRn</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">rnHsSigType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">doc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TypeLevel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inf_err</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">dct</span></span>
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<pre style="margin: 0;">+<span id="LC1834" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnLDerivStrategy</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">dcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mapFvRn</span> <span class="n" style="color: #333;"><span class="idiff left right">rn_clause_pred</span></span> <span class="n" style="color: #333;">dct</span></span>
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1809
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1835
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<pre style="margin: 0;"> <span id="LC1835" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnNoDerivStrat</span> <span class="n" style="color: #333;">dcs'</span> <span class="n" style="color: #333;">loc</span></span>
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1810
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1836
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsDerivingClause</span> <span class="p">{</span> <span class="n" style="color: #333;">deriv_clause_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span></span>
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1811
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1837
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_clause_strategy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dcs'</span></span>
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1812
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1838
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<pre style="margin: 0;"> <span id="LC1838" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">deriv_clause_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">dct'</span> <span class="p">})</span></span>
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1813
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1839
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<pre style="margin: 0;"> <span id="LC1839" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fvs</span> <span class="p">)</span> <span class="p">}</span></span>
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1814
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1840
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1815
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<pre style="margin: 0;">-<span id="LC1815" class="line" lang="haskell"> <span class="n" style="color: #333;">inf_err</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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1841
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<pre style="margin: 0;">+<span id="LC1841" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_clause_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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1842
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<pre style="margin: 0;">+<span id="LC1842" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_clause_pred</span> <span class="n" style="color: #333;">pred_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1843
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<pre style="margin: 0;">+<span id="LC1843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inf_err</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inferred type variables are not allowed"</span><span class="p">)</span></span>
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1844
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<pre style="margin: 0;">+<span id="LC1844" class="line" lang="haskell"> <span class="n" style="color: #333;">ret</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">pred_ty'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">pred_ty</span></span>
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1845
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<pre style="margin: 0;">+<span id="LC1845" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s, which are illegal in a</span></span>
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1846
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<pre style="margin: 0;">+<span id="LC1846" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `deriving` clause.</span></span>
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1847
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<pre style="margin: 0;">+<span id="LC1847" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No nested foralls or contexts in instance types]</span></span>
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1848
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<pre style="margin: 0;">+<span id="LC1848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Wrinkle: Derived instances) in GHC.Hs.Type.</span></span>
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1849
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<pre style="margin: 0;">+<span id="LC1849" class="line" lang="haskell"> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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1850
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<pre style="margin: 0;">+<span id="LC1850" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Derived class type"</span><span class="p">)</span></span>
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1851
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<pre style="margin: 0;">+<span id="LC1851" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getLHsInstDeclHead</span> <span class="n" style="color: #333;">pred_ty'</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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1852
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">err_msg</span></span>
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">ret</span></span>
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1854
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<pre style="margin: 0;"> <span id="LC1854" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1855" class="line" lang="haskell"><span class="n" style="color: #333;">rnLDerivStrategy</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>
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1856
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<pre style="margin: 0;"> <span id="LC1856" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</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">@@ -1848,9 +1886,17 @@ rnLDerivStrategy doc mds thing_inside</td>
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1848
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1886
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">(</span><span class="n" style="color: #333;">via_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">doc</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">inf_err</span> <span class="n" style="color: #333;">via_ty</span></span>
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1849
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1887
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_imp_tvs</span></span>
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1850
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1888
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<pre style="margin: 0;"> <span id="LC1888" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_body</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_ty'</span></span>
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1851
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<pre style="margin: 0;">-<span id="LC1851" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">via_exp_tv_bndrs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">splitLHsSigmaTyInvis</span></span> <span class="n" style="color: #333;">via_body</span></span>
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1852
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<pre style="margin: 0;">-<span id="LC1852" class="line" lang="haskell"> <span class="n" style="color: #333;">via_exp_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">via_exp_tv_bndrs</span></span>
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1889
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">via_exp_tv_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left">via_rho</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">splitLHsForAllTyInvis_KP</span></span> <span class="n" style="color: #333;">via_body</span></span>
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1890
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"> <span class="n" style="color: #333;">via_exp_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">[]</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">via_exp_tv_bndrs</span></span>
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1891
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"> <span class="n" style="color: #333;">via_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">via_imp_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">via_exp_tvs</span></span>
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1892
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check if there are any nested `forall`s, which are illegal in a</span></span>
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1893
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `via` type.</span></span>
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1894
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [No nested foralls or contexts in instance types]</span></span>
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1895
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Wrinkle: Derived instances) in GHC.Hs.Type.</span></span>
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1896
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"via"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type"</span><span class="p">)</span></span>
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1898
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<pre style="margin: 0;">+<span id="LC1898" class="line" lang="haskell"> <span class="n" style="color: #333;">via_rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC1899" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">err_msg</span></span>
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1854
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">thing</span><span class="p">,</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">extendTyVarEnvFVRn</span> <span class="n" style="color: #333;">via_tvs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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1855
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ViaStrategy</span> <span class="n" style="color: #333;">via_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">fvs2</span><span class="p">)</span></span>
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1856
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"></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">@@ -2181,18 +2227,10 @@ rnConDecl (XConDecl (ConDeclGADTPrefixPs { con_gp_names = names, con_gp_ty = ty</td>
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2181
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2227
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<pre style="margin: 0;"> <span id="LC2227" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Ensure that there are no nested `forall`s or contexts, per</span></span>
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2182
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2228
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<pre style="margin: 0;"> <span id="LC2228" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts)</span></span>
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2183
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2229
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<pre style="margin: 0;"> <span id="LC2229" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Hs.Type.</span></span>
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2184
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<pre style="margin: 0;">-<span id="LC2184" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2185
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<pre style="margin: 0;">-<span id="LC2185" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvf</span> <span class="p">})</span></span>
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2186
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<pre style="margin: 0;">-<span id="LC2186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallVis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2187
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<pre style="margin: 0;">-<span id="LC2187" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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2188
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<pre style="margin: 0;">-<span id="LC2188" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal visible, dependent quantification"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2189
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<pre style="margin: 0;">-<span id="LC2189" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in the type of a term"</span></span>
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2190
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<pre style="margin: 0;">-<span id="LC2190" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(GHC does not yet support this)"</span> <span class="p">]</span></span>
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2191
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<pre style="margin: 0;">-<span id="LC2191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2192
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<pre style="margin: 0;">-<span id="LC2192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span></span>
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2193
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<pre style="margin: 0;">-<span id="LC2193" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{})</span></span>
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2194
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<pre style="margin: 0;">-<span id="LC2194" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span></span>
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2195
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<pre style="margin: 0;">-<span id="LC2195" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2230
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<pre style="margin: 0;">+<span id="LC2230" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="p">(</span><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span></span>
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2231
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<pre style="margin: 0;">+<span id="LC2231" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature"</span><span class="p">)</span></span>
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2232
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<pre style="margin: 0;">+<span id="LC2232" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">err_msg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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2233
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<pre style="margin: 0;">+<span id="LC2233" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrAt</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err_msg</span></span>
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2196
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2234
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<pre style="margin: 0;"> <span id="LC2234" class="line" lang="haskell"></span>
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2197
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2235
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<pre style="margin: 0;"> <span id="LC2235" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceRn</span> <span class="s" style="color: #d14;">"rnConDecl (ConDeclGADTPrefixPs)"</span></span>
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2198
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2236
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<pre style="margin: 0;"> <span id="LC2236" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">names</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">implicit_tkvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">explicit_tkvs</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2239" 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">@@ -2201,12 +2239,6 @@ rnConDecl (XConDecl (ConDeclGADTPrefixPs { con_gp_names = names, con_gp_ty = ty</td>
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2201
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2239
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<pre style="margin: 0;"> <span id="LC2239" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_mb_cxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mb_cxt</span><span class="p">,</span> <span class="n" style="color: #333;">con_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arg_details</span></span>
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2202
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2240
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<pre style="margin: 0;"> <span id="LC2240" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">con_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">con_doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mb_doc'</span> <span class="p">},</span></span>
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2203
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2241
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<pre style="margin: 0;"> <span id="LC2241" class="line" lang="haskell"> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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2204
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<pre style="margin: 0;">-<span id="LC2204" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2205
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<pre style="margin: 0;">-<span id="LC2205" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2206
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<pre style="margin: 0;">-<span id="LC2206" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span></span>
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2207
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<pre style="margin: 0;">-<span id="LC2207" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addErr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">withHsDocContext</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">$</span></span>
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2208
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<pre style="margin: 0;">-<span id="LC2208" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"GADT constructor type signature cannot contain nested"</span></span>
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2209
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<pre style="margin: 0;">-<span id="LC2209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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2210
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2242
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<pre style="margin: 0;"> <span id="LC2242" class="line" lang="haskell"></span>
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2211
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2243
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<pre style="margin: 0;"> <span id="LC2243" class="line" lang="haskell"><span class="n" style="color: #333;">rnMbContext</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsDocContext</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">)</span></span>
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2212
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2244
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<pre style="margin: 0;"> <span id="LC2244" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2268" 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">@@ -2236,6 +2268,41 @@ rnConDeclDetails con doc (RecCon (L l fields))</td>
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2236
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2268
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<pre style="margin: 0;"> <span id="LC2268" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since that is done by GHC.Rename.Names.extendGlobalRdrEnvRn</span></span>
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2237
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<pre style="margin: 0;"> <span id="LC2269" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">new_fields</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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2238
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2270
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<pre style="margin: 0;"> <span id="LC2270" class="line" lang="haskell"></span>
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2271
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<pre style="margin: 0;">+<span id="LC2271" class="line" lang="haskell"><span class="cd">-- | Examines a non-outermost type for @forall@s or contexts, which are assumed</span></span>
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2272
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<pre style="margin: 0;">+<span id="LC2272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be nested. Returns @'Just' err_msg@ if such a @forall@ or context is</span></span>
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2273
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<pre style="margin: 0;">+<span id="LC2273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- found, and returns @Nothing@ otherwise.</span></span>
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2274
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<pre style="margin: 0;">+<span id="LC2274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2275
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<pre style="margin: 0;">+<span id="LC2275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is currently used in two places:</span></span>
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2276
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<pre style="margin: 0;">+<span id="LC2276" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2277
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<pre style="margin: 0;">+<span id="LC2277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In GADT constructor types (in 'rnConDecl').</span></span>
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2278
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<pre style="margin: 0;">+<span id="LC2278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts)@</span></span>
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2279
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<pre style="margin: 0;">+<span id="LC2279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in "GHC.Hs.Type".</span></span>
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2280
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<pre style="margin: 0;">+<span id="LC2280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2281
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<pre style="margin: 0;">+<span id="LC2281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * In instance declaration types (in 'rnClsIntDecl' and 'rnSrcDerivDecl').</span></span>
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2282
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<pre style="margin: 0;">+<span id="LC2282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [No nested foralls or contexts in instance types]@ in</span></span>
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2283
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<pre style="margin: 0;">+<span id="LC2283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Hs.Type".</span></span>
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2284
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<pre style="margin: 0;">+<span id="LC2284" class="line" lang="haskell"><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span></span>
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2285
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<pre style="margin: 0;">+<span id="LC2285" class="line" lang="haskell"><span class="n" style="color: #333;">no_nested_foralls_contexts_err</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">lty</span> <span class="o" style="font-weight: 600;">=</span></span>
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2286
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<pre style="margin: 0;">+<span id="LC2286" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">lty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2287
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<pre style="margin: 0;">+<span id="LC2287" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{</span> <span class="n" style="color: #333;">hst_fvf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fvf</span> <span class="p">})</span></span>
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2288
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<pre style="margin: 0;">+<span id="LC2288" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallVis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2289
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<pre style="margin: 0;">+<span id="LC2289" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The only two places where this function is called correspond to</span></span>
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2290
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<pre style="margin: 0;">+<span id="LC2290" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types of terms, so we give a slightly more descriptive error</span></span>
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2291
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- message in the event that they contain visible dependent</span></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantification (currently only allowed in kinds).</span></span>
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2293
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<pre style="margin: 0;">+<span id="LC2293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal visible, dependent quantification"</span> <span class="o" style="font-weight: 600;"><+></span></span>
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2294
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in the type of a term"</span></span>
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2295
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"(GHC does not yet support this)"</span> <span class="p">])</span></span>
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2296
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<pre style="margin: 0;">+<span id="LC2296" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ForallInvis</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fvf</span></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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2298
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<pre style="margin: 0;">+<span id="LC2298" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsQualTy</span> <span class="p">{})</span></span>
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2299
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<pre style="margin: 0;">+<span id="LC2299" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">l</span><span class="p">,</span> <span class="n" style="color: #333;">nested_foralls_contexts_err</span><span class="p">)</span></span>
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2300
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"> <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;">Nothing</span></span>
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2301
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<pre style="margin: 0;">+<span id="LC2301" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2302
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<pre style="margin: 0;">+<span id="LC2302" class="line" lang="haskell"> <span class="n" style="color: #333;">nested_foralls_contexts_err</span> <span class="o" style="font-weight: 600;">=</span></span>
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2303
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"> <span class="n" style="color: #333;">what</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cannot contain nested"</span></span>
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<pre style="margin: 0;">+<span id="LC2304" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"s or contexts"</span></span>
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<pre style="margin: 0;">+<span id="LC2305" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2306" 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="LC2307" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2308" class="line" lang="haskell"><span class="cd">-- | Brings pattern synonym names and also pattern synonym selectors</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">@@ -124,6 +124,22 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"> data U a where</span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext"> MkU :: (Show a => U a)</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="plaintext">* GHC more strictly enforces the rule that the type in the top of an instance</span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="plaintext"> declaration is not permitted to contain nested ``forall``s or contexts, as</span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="plaintext"> documented in :ref:`formal-instance-syntax`. For example, the following</span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="plaintext"> examples, which previous versions of GHC would accept, are now rejected:</span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="plaintext"> instance (forall a. C a) where ...</span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext"> instance (Show a => C a) where ...</span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="plaintext"> In addition, GHC now enforces the rule that the types in ``deriving`` clauses</span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext"> and ``via`` types (for instances derived with :extension:`DerivingVia`)</span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext"> cannot contain nested ``forall``s or contexts. For example, the following</span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext"> examples, which previous versions of GHC would accept, are now rejected: ::</span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext"> data T = MkT deriving (C1, (forall x. C2 x))</span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"> deriving via (forall x. V x) instance C (S x)</span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#afd1105d8e32dc50acf9fc381b4433a3bcd009cf"><strong>docs/users_guide/exts/explicit_forall.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">@@ -37,6 +37,11 @@ Notes:</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> instance forall a. Eq a => Eq [a] where ...</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"> Note that the use of ``forall``s in instance declarations is somewhat</span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> restricted in comparison to other types. For example, instance declarations</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> are not allowed to contain nested ``forall``s. See</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> :ref:`formal-instance-syntax` for more information.</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">- If the :ghc-flag:`-Wunused-foralls` flag is enabled, a warning will be emitted</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"> when you write a type variable in an explicit ``forall`` statement that is</span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext"> otherwise unused. For instance: ::</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#ed75822e0b6142f196a6abeb623c7669d31b4711"><strong>docs/users_guide/exts/instances.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">@@ -99,6 +99,77 @@ GHC relaxes this rule in two ways:</td>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="plaintext">However, the instance declaration must still conform to the rules for</span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="plaintext">instance termination: see :ref:`instance-termination`.</span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext">.. _formal-instance-syntax:</span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext">Formal syntax for instance declaration types</span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext">The top of an instance declaration only permits very specific forms of types.</span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">To make more precise what forms of types are or are not permitted, we provide a</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext">BNF-style grammar for the tops of instance declarations below: ::</span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext"> inst_top ::= 'instance' opt_forall opt_ctxt inst_head opt_where</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext"> opt_forall ::= <empty></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"> | 'forall' tv_bndrs '.'</span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"> tv_bndrs ::= <empty></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"> | tv_bndr tv_bndrs</span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext"> tv_bndr ::= tyvar</span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext"> | '(' tyvar '::' ctype ')'</span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext"></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"> opt_ctxt ::= <empty></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> | btype '=>'</span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="plaintext"> | '(' ctxt ')' '=>'</span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="plaintext"></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="plaintext"> ctxt ::= ctype</span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="plaintext"> | ctype ',' ctxt</span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="plaintext"></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="plaintext"> inst_head ::= '(' inst_head ')'</span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="plaintext"> | prefix_cls_tycon arg_types</span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="plaintext"> | arg_type infix_cls_tycon arg_type</span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="plaintext"> | '(' arg_type infix_cls_tycon arg_type ')' arg_types</span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext"></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext"> arg_type ::= <empty></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="plaintext"> | arg_type arg_types</span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="plaintext"></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext"> opt_where ::= <empty></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext"> | 'where'</span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext"></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">Where:</span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext">- ``btype`` is a type that is not allowed to have an outermost</span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext"> ``forall``/``=>`` unless it is surrounded by parentheses. For example,</span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext"> ``forall a. a`` and ``Eq a => a`` are not legal ``btype``s, but</span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"> ``(forall a. a)`` and ``(Eq a => a)`` are legal.</span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext">- ``ctype`` is a ``btype`` that has no restrictions on an outermost</span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext"> ``forall``/``=>``, so ``forall a. a`` and ``Eq a => a`` are legal ``ctype``s.</span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext">- ``arg_type`` is a type that is not allowed to have ``forall``s or ``=>``s</span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext">- ``prefix_cls_tycon`` is a class type constructor written prefix (e.g.,</span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext"> ``Show`` or ``(&&&)``), while ``infix_cls_tycon`` is a class type constructor</span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="plaintext"> written infix (e.g., ```Show``` or ``&&&``).</span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="plaintext"></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="plaintext">This is a simplified grammar that does not fully delve into all of the</span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="plaintext">implementation details of GHC's parser (such as the placement of Haddock</span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="plaintext">comments), but it is sufficient to attain an understanding of what is</span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext">syntactically allowed. Some further various observations about this grammar:</span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="plaintext"></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext">- Instance declarations are not allowed to be declared with nested ``forall``s</span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext"> or ``=>``s. For example, this would be rejected: ::</span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext"></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext"> instance forall a. forall b. C (Either a b) where ...</span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext"></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext"> As a result, ``inst_top`` puts all of its quantification and constraints up</span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext"> front with ``opt_forall`` and ``opt_context``.</span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">- Furthermore, instance declarations types do not permit outermost parentheses</span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext"> that surround the ``opt_forall`` or ``opt_ctxt``, if at least one of them are</span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="plaintext"> used. For example, ``instance (forall a. C a)`` would be rejected, since GHC</span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext"> would treat the ``forall`` as being nested.</span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext"> Note that it is acceptable to use parentheses in a ``inst_head``. For</span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext"> instance, ``instance (C a)`` is accepted, as is ``instance forall a. (C a)``.</span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">.. _instance-rules:</span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext">Relaxed rules for instance contexts</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#aa2301674e0cbbe7c768058a6ef910ddc4fae0a0"><strong>docs/users_guide/exts/scoped_type_variables.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">@@ -16,11 +16,11 @@ Lexically scoped type variables</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">.. tip::</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> <span class="idiff left right">``ScopedTypeVariables`</span>` breaks GHC's usual rule that explicit ``forall`` is optional and doesn't affect semantics.</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> <span class="idiff left right">:extension:`ScopedTypeVariables</span>` breaks GHC's usual rule that explicit ``forall`` is optional and doesn't affect semantics.</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> For the :ref:`decl-type-sigs` (or :ref:`exp-type-sigs`) examples in this section,</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> the explicit ``forall`` is required.</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> (If omitted, usually the program will not compile; in a few cases it will compile but the functions get a different signature.)</span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> To trigger those forms of <span class="idiff left right">``ScopedTypeVariables`</span>`, the ``forall`` must appear against the top-level signature (or outer expression)</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> To trigger those forms of <span class="idiff left right">:extension:`ScopedTypeVariables</span>`, the ``forall`` must appear against the top-level signature (or outer expression)</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> but *not* against nested signatures referring to the same type variables.</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> Explicit ``forall`` is not always required -- see :ref:`pattern signature equivalent <pattern-equiv-form>` for the example in this section, or :ref:`pattern-type-sigs`.</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">@@ -261,11 +261,12 @@ the pattern, rather than the pattern binding the variable.</td>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="plaintext">Class and instance declarations</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"></span>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="plaintext">The type variables in the head of a ``class`` or ``instance``</span>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="plaintext">declaration scope over the methods defined in the ``where`` part. You do</span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="plaintext">not even need an explicit ``forall`` (although you are allowed an explicit</span>
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="plaintext">``forall`` in an ``instance`` declaration; see :ref:`explicit-foralls`).</span>
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="plaintext">For example: ::</span>
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="plaintext">:extension:`ScopedTypeVariables` allow the type variables bound by the top of a</span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="plaintext">``class`` or ``instance`` declaration to scope over the methods defined in the</span>
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="plaintext">``where`` part. Unlike :ref`decl-type-sigs`, type variables from class and</span>
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="plaintext">instance declarations can be lexically scoped without an explicit ``forall``</span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="plaintext">(although you are allowed an explicit ``forall`` in an ``instance``</span>
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="plaintext">declaration; see :ref:`explicit-foralls`). For example: ::</span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="plaintext"> class C a where</span>
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="plaintext"> op :: [a] -> a</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">@@ -278,4 +279,36 @@ For example: ::</td>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="plaintext"> instance C b => C [b] where</span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="plaintext"> op xs = reverse (head (xs :: [[b]]))</span>
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="plaintext"> -- Alternatively, one could write the instance above as:</span>
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="plaintext"> instance forall b. C b => C [b] where</span>
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="plaintext"> op xs = reverse (head (xs :: [[b]]))</span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="plaintext">While :extension:`ScopedTypeVariables` is required for type variables from the</span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="plaintext">top of a class or instance declaration to scope over the /bodies/ of the</span>
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="plaintext">methods, it is not required for the type variables to scope over the /type</span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="plaintext">signatures/ of the methods. For example, the following will be accepted without</span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="plaintext">explicitly enabling :extension:`ScopedTypeVariables`: ::</span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="plaintext"> class D a where</span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="plaintext"> m :: [a] -> a</span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="plaintext"> instance D [a] where</span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="plaintext"> m :: [a] -> [a]</span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="plaintext"> m = reverse</span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="plaintext">Note that writing ``m :: [a] -> [a]`` requires the use of the</span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="plaintext">:extension:`InstanceSigs` extension.</span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="plaintext">Similarly, :extension:`ScopedTypeVariables` is not required for type variables</span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="plaintext">from the top of the class or instance declaration to scope over associated type</span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="plaintext">families, which only requires the :extension:`TypeFamilies` extension. For</span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="plaintext">instance, the following will be accepted without explicitly enabling</span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="plaintext">:extension:`ScopedTypeVariables`: ::</span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="plaintext"> class E a where</span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="plaintext"> type T a</span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="plaintext"> instance E [a] where</span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="plaintext"> type T [a] = a</span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="plaintext">See :ref:`scoping-class-params` for further information.</span></pre>
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<li id="93c64333f070b164541735b51a8744759d526b14">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#93c64333f070b164541735b51a8744759d526b14"><strong>testsuite/tests/dependent/should_fail/T16326_Fail8.stderr</strong></a>
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1
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1
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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2
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16326_Fail8.hs:7:10: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Illegal class instance: ‘forall a -> C (Blah a)’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Class instances must be of the form</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> context => C ty_1 ... ty_n</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> where ‘C’ is a class</span></pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Illegal visible, dependent quantification in the type of a term</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> (GHC does not yet support this)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In an instance declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#f92307abf65d8bac17d3db9c233257096f38b948"><strong>testsuite/tests/dependent/should_fail/T18271.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 DeriveAnyClass #-}</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 StandaloneDeriving #-}</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;">T18271</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;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</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="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18271.hs:7:19: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Illegal visible, dependent quantification in the type of a term</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> (GHC does not yet support this)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In a deriving declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#ff9e00d3839a68830e26f2566987483d69b42545"><strong>testsuite/tests/dependent/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">@@ -65,3 +65,4 @@ test('T14880-2', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15076</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="LC66" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15076b</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="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17687</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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68
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18271</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/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#acb406a2f9ac5f8c9d59f7fc273c23a554dc7ee6"><strong>testsuite/tests/deriving/should_compile/T15831.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">@@ -13,21 +13,21 @@ newtype Age = MkAge Int</td>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Any</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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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Read</span></span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">k</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Enum</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;">Const</span> <span class="kt" style="color: #458; font-weight: 600;">Int</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>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></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="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkAge2</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff right"> </span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff right">)</span>)</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Read</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff right"> </span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Enum</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span></pre>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Any</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Any</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">k</span></span><span class="p">)</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Read</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Enum</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">k</span></span><span class="p"><span class="idiff">)</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Int</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="kt" style="color: #458; font-weight: 600;">Age2</span></span></pre>
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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">@@ -37,6 +37,6 @@ data X1 a</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">X2</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">X3</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>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X1</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X2</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X3</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X1</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X2</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">T</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span> <span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X3</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#5df5554417242788fa4a53d83e05a5101bae7853"><strong>testsuite/tests/deriving/should_fail/deriving-via-fail.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">@@ -12,4 +12,4 @@ newtype Foo2 a b = Foo2 (a -> b)</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Category</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;">fooo</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Foo3</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Foo3</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#4db3d282e03001f5056ab13042451e8ecc93641d"><strong>testsuite/tests/deriving/should_fail/deriving-via-fail4.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,4 +14,4 @@ newtype F1 = F1 Int</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">via</span> <span class="kt" style="color: #458; font-weight: 600;">Char</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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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="kt" style="color: #458; font-weight: 600;">F2</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;">MkF2</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="n" style="color: #333;">via</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="p"><span class="idiff right">)</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;"><span class="idiff left">forall</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#b63e9618517f0d9b41caa8adff37da787487a740"><strong>testsuite/tests/parser/should_fail/T3811c.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T3811c.hs:6:10: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Illegal <span class="idiff left right">class instance</span>: ‘!Show D’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right">Class instance</span>s must be of the form</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> <span class="idiff left right">context => </span>C ty_1 ... ty_n</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Illegal <span class="idiff left right">head of an instance declaration</span>: ‘!Show D’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> <span class="idiff left right">Instance head</span>s must be of the form</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> C ty_1 ... ty_n</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> where ‘C’ is a class</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In an instance declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#be905d068488b64580a9e32a37d73cb5121c444b"><strong>testsuite/tests/rename/should_fail/T16114.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T16114.hs:4:10: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Illegal class instance: ‘Eq a => Eq a => Eq (T a)’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Class instances must be of the form</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> context => C ty_1 ... ty_n</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> where ‘C’ is a class</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16114.hs:4:18: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an instance declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#96a6318e3a0dc35a75c7af4ef268cc42c2c5cf4c"><strong>testsuite/tests/rename/should_fail/T18240a.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 ScopedTypeVariables #-}</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 TypeApplications #-}</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;">T18240a</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.Proxy</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;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</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="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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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;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</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;">C</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">])</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</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="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</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="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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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="c1" style="color: #998; font-style: italic;">-- Some other nonsensical instance types</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="mi" style="color: #099;">42</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#8f58862cfc9faa28ee4d3709d65dad5ed8deb04e"><strong>testsuite/tests/rename/should_fail/T18240a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18240a.hs:11:11: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an instance declaration</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18240a.hs:12:15: error: Not in scope: type variable ‘a’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">T18240a.hs:14:11: error:</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> In an instance declaration</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">T18240a.hs:17:11: error:</span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In an instance declaration</span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">T18240a.hs:18:22: error: Not in scope: type variable ‘a’</span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18240a.hs:20:21: error:</span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In an instance declaration</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">T18240a.hs:21:24: error: Not in scope: type variable ‘b’</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">T18240a.hs:23:19: error:</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> In an instance declaration</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">T18240a.hs:28:10: error:</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> Illegal head of an instance declaration: ‘42’</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> Instance heads must be of the form</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> C ty_1 ... ty_n</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> where ‘C’ is a class</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> In an instance declaration</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">T18240a.hs:29:10: error:</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> Illegal head of an instance declaration: ‘Int -> Int’</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> Instance heads must be of the form</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"> C ty_1 ... ty_n</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> where ‘C’ is a class</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"> In an instance declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#034068f58f4d584425f2837a71a02e7e40490975"><strong>testsuite/tests/rename/should_fail/T18240b.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 DeriveAnyClass #-}</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 DerivingVia #-}</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 ExplicitForAll #-}</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 FlexibleInstances #-}</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 MultiParamTypeClasses #-}</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 StandaloneDeriving #-}</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;">T18240b</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.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">z</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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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="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkFoo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">via</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</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;">y</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</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;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C1</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C2</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">z</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Bar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkBar</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="n" style="color: #333;">anyclass</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">C1</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C2</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">y</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C2</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">x</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;">y</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C2</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#4c136fc4373e90782cb2edc4ec02558397657be8"><strong>testsuite/tests/rename/should_fail/T18240b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18240b.hs:17:15: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> ‘via’ type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In a deriving declaration</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18240b.hs:18:24: error:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> ‘via’ type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> In a deriving declaration</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18240b.hs:19:25: error:</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> ‘via’ type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In a deriving declaration</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T18240b.hs:26:24: error:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Derived class type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> In the data type declaration for ‘Bar’</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18240b.hs:27:33: error:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Derived class type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> In the data type declaration for ‘Bar’</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">T18240b.hs:28:34: error:</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> Derived class type cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> In the data type declaration for ‘Bar’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#ee37751d799a602d239c6ebe3b4f3ff3666385e3"><strong>testsuite/tests/rename/should_fail/T5951.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T5951.hs:8:8: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Illegal class instance: ‘A => B => C’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Class instances must be of the form</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> context => C ty_1 ... ty_n</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> where ‘C’ is a class</span></pre>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T5951.hs:9:8: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an instance declaration</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#c2554d4efde41e6e193f728122336449d2cb5fc5"><strong>testsuite/tests/rename/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">@@ -154,3 +154,5 @@ test('T14548', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16610</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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155
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155
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17593</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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156
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156
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18145</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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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18240a</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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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18240b</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/15bfa78c6024bc2ca90bbbd15ea9f0ba84b14fe7#1e6f7fe82ba2b06a45e4a33efaa12da5df7237cb"><strong>testsuite/tests/typecheck/should_fail/T16394.stderr</strong></a>
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1
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">T16394.hs:6:10: error:</span>
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2
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext"> Illegal class instance: ‘C a => C b => C (a, b)’</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> Class instances must be of the form</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> context => C ty_1 ... ty_n</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> where ‘C’ is a class</span></pre>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16394.hs:6:17: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Instance head cannot contain nested ‘forall’s or contexts</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an instance declaration</span></pre>
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