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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708">3c94c816</a></strong>
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<span>by HaskellMouse</span>
<i>at 2020-09-17T08:49:51-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Added explicit fixity to (~).
Solves #18252
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<h4>7 changed files:</h4>
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<a href="#e1dc7d84d8f2c952dba37b15142001f1d7952318">
libraries/ghc-prim/GHC/Types.hs
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<a href="#54f2593fa6d429b2b82cc2200e8bcda0f38854de">
libraries/ghc-prim/changelog.md
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testsuite/tests/ghci/T18060/T18060.stdout
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testsuite/tests/ghci/scripts/T10059.stdout
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testsuite/tests/typecheck/should_compile/T18252.hs
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testsuite/tests/typecheck/should_fail/T18252a.hs
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testsuite/tests/typecheck/should_fail/T18252a.stderr
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<h4>Changes:</h4>
<li id="e1dc7d84d8f2c952dba37b15142001f1d7952318">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#e1dc7d84d8f2c952dba37b15142001f1d7952318"><strong>libraries/ghc-prim/GHC/Types.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">@@ -256,13 +256,20 @@ inside GHC, to change the kind and type.</td>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- about the difference between heterogeneous equality @~~@ and</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- homogeneous equality @~@, this is printed as @~@ unless</span></span>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @-fprint-equality-relations@ is set.</span></span>
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<pre style="margin: 0;">+<span id="LC259" 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="LC260" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In @0.7.0@, the fixity was set to @infix 4@ to match the fixity of 'Data.Type.Equality.:~~:'.</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~~</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [The equality types story] in GHC.Builtin.Types.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"><span class="cd">-- | Lifted, homogeneous equality. By lifted, we mean that it</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can be bogus (deferred type error). By homogeneous, the two</span></span>
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- types @a@ and @b@ must have the same kinds.</span></span>
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In @0.7.0@, the fixity was set to @infix 4@ to match the fixity of 'Data.Type.Equality.:~:'.</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infix</span> <span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">~</span><span class="p">,</span> <span class="o" style="font-weight: 600;">~~</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [The equality types story] in GHC.Builtin.Types.Prim</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"><span class="cd">-- | @Coercible@ is a two-parameter class that has instances for types @a@ and @b@ if</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#54f2593fa6d429b2b82cc2200e8bcda0f38854de"><strong>libraries/ghc-prim/changelog.md</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">@@ -24,6 +24,10 @@</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="markdown"><span class="sb" style="color: #d14;"> interlockedExchangeAddr# :: Addr# -> Addr# -> State# s -> (# State# s, Addr# #)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="markdown"><span class="sb" style="color: #d14;"> interlockedExchangeInt# :: Addr# -> Int# -> State# s -> (# State# s, Int# #)</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="markdown"><span class="p">-</span> Add an explicit fixity for <span class="sb" style="color: #d14;">`(~)`</span> and <span class="sb" style="color: #d14;">`(~~)`</span>: </span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="markdown"><span class="sb" style="color: #d14;"> infix 4 ~, ~~</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 0.6.1 (edit as necessary)</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="markdown"><span class="p">-</span> Shipped with GHC 8.10.1</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#ec1a4945ff609e17915d75839baaed893d646689"><strong>testsuite/tests/ghci/T18060/T18060.stdout</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">@@ -10,3 +10,4 @@ instance Semigroup b => Semigroup (a -> b) -- Defined in ‘GHC.Base’</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">type (~) :: forall k. k -> k -> Constraint</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">class (a ~ b) => (~) a b</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> -- Defined in ‘GHC.Types’</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">infix 4 ~</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#0fedbf93f7e04e87c4734638fe931bc25a21402f"><strong>testsuite/tests/ghci/scripts/T10059.stdout</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">type (~) :: forall k. k -> k -> Constraint</span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">class (a ~ b) => (~) a b</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> -- Defined in ‘GHC.Types’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">infix 4 ~</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">(~) :: k -> k -> Constraint</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">type (~) :: forall k. k -> k -> Constraint</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">class (a GHC.Prim.~# b) => (~) a b</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> -- Defined in ‘GHC.Types’</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">infix 4 ~</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#c8e120c86754111cebdaaf2ad9c47a4526afd7c4"><strong>testsuite/tests/typecheck/should_compile/T18252.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 TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18252</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></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;">GHC.TypeNats</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="n" style="color: #333;">eq</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">~</span> <span class="mi" style="color: #099;">3</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="p">((</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">~</span> <span class="mi" style="color: #099;">3</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">eq</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#47ce7ba3f8ebf8f585cd3dae8ddf0f7e139f53ed"><strong>testsuite/tests/typecheck/should_fail/T18252a.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 TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18252a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></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;">GHC.TypeNats</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="n" style="color: #333;">eq</span> <span class="o" style="font-weight: 600;">::</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;">b</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">c</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">eq</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c94c81629ac9159775b8b70baf2c635f0331708#31e482b0eb7a1f0fbc6d34d69e5b56375a7b014c"><strong>testsuite/tests/typecheck/should_fail/T18252a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18252a.hs:8:10:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Precedence parsing error</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> cannot mix ‘~’ [infix 4] and ‘~’ [infix 4] in the same infix expression</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">\ No newline at end of file</td>
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