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<h3>
Ryan Scott pushed to branch wip/T18389
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29">44939c67</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-10-24T08:18:29-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept even more stderr changes, improve UnliftedNewtypes-related suggestion
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<h4>6 changed files:</h4>
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<a href="#38eb0b9fdb1773283821b4c44a36ffeae73dfe9c">
testsuite/tests/typecheck/should_fail/T12729.stderr
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<a href="#9ba7d30aaa93d8c470617c64d19908b6f941a798">
testsuite/tests/typecheck/should_fail/T15807.stderr
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<a href="#b11ea57e1fdb00ae7e227c17d85d5aaf46797af9">
testsuite/tests/typecheck/should_fail/T15883.stderr
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<li class="file-stats">
<a href="#0c0066c215dfb96ea8750c9339033a1b7b836be8">
testsuite/tests/typecheck/should_fail/UnliftedNewtypesNotEnabled.stderr
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<li class="file-stats">
<a href="#de027817ce03a4ac924feb3a9c8579a1528072f6">
testsuite/tests/typecheck/should_fail/tcfail079.stderr
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<h4>Changes:</h4>
<li id="83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.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">@@ -4180,7 +4180,7 @@ checkNewDataCon con</td>
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4180
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4180
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<pre style="margin: 0;"> <span id="LC4180" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">allowedArgType</span> <span class="o" style="font-weight: 600;">=</span></span>
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4181
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<pre style="margin: 0;"> <span id="LC4181" class="line" lang="haskell"> <span class="n" style="color: #333;">unlifted_newtypes</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isLiftedType_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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4182
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<pre style="margin: 0;"> <span id="LC4182" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="n" style="color: #333;">allowedArgType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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4183
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<pre style="margin: 0;">-<span id="LC4183" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A newtype <span class="idiff left right">cannot have an unlifted argument type"</span></span></span>
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<pre style="margin: 0;">+<span id="LC4183" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"A newtype <span class="idiff left">must have an argument of kind"</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">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">liftedTypeKind</span></span></span>
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4184
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<pre style="margin: 0;"> <span id="LC4184" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Perhaps you intended to use UnliftedNewtypes"</span></span>
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<pre style="margin: 0;"> <span id="LC4185" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC4186" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">show_linear_types</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xopt</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;">LinearTypes</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29#38eb0b9fdb1773283821b4c44a36ffeae73dfe9c"><strong>testsuite/tests/typecheck/should_fail/T12729.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">T12729.hs:8:4: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • A newtype <span class="idiff left right">cannot have an unlifted argument type</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • A newtype <span class="idiff left right">must have an argument of kind *</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘MkA’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the newtype declaration for ‘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">T12729.hs:10:13: error:</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> • A newtype <span class="idiff left right">cannot have an unlifted argument type</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • A newtype <span class="idiff left right">must have an argument of kind *</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> • In the definition of data constructor ‘MkB’</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> In the newtype declaration for ‘B’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29#9ba7d30aaa93d8c470617c64d19908b6f941a798"><strong>testsuite/tests/typecheck/should_fail/T15807.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">T15807.hs:12:3: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Cannot generalise type; skolem ‘f’ would escape its scope</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Cannot generalise type; skolem</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘(f :: k0 -> *)’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> would escape its scope</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> if I tried to quantify (f0 :: f -> *) in this type:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> forall <span class="idiff left right">f (a :: f</span>). f a %1 -> App @f @f0 a</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> forall <span class="idiff left right">(f :: k0 -> *) (a :: k0</span>). f a %1 -> App @f @f0 a</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> (Indeed, I sometimes struggle even printing this correctly,</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> due to its ill-scoped nature.)</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> • In the definition of data constructor ‘MkApp’</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29#b11ea57e1fdb00ae7e227c17d85d5aaf46797af9"><strong>testsuite/tests/typecheck/should_fail/T15883.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">T15883.hs:9:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • <span class="idiff left right">Newtype has non-* return kind ‘TYPE rep’</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T15883.hs:9:1<span class="idiff left right">9</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • <span class="idiff left right">A newtype must have an argument of kind *</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the newtype declaration for ‘Foo’</span></pre>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘MkFoo’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the newtype declaration for ‘Foo’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44939c67cb93b75296ffe4c788239d07589b5a29#0c0066c215dfb96ea8750c9339033a1b7b836be8"><strong>testsuite/tests/typecheck/should_fail/UnliftedNewtypesNotEnabled.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">UnliftedNewtypesNotEnabled.hs:9:15: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • A newtype <span class="idiff left right">cannot have an unlifted argument type</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • A newtype <span class="idiff left right">must have an argument of kind *</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘Baz’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the newtype declaration for ‘Baz’</span></pre>
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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">tcfail079.hs:9:1: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • <span class="idiff left right">Newtype has non-* return kind ‘TYPE 'GHC.Types.IntRep’</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">tcfail079.hs:9:1<span class="idiff left right">9</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • <span class="idiff left right">A newtype must have an argument of kind *</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Perhaps you intended to use UnliftedNewtypes</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the newtype declaration for ‘Unboxed’</span></pre>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the definition of data constructor ‘Unboxed’</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the newtype declaration for ‘Unboxed’</span></pre>
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