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<h3>
Brandon Chinn pushed to branch wip/T16341
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/91fa5efabb15b2467296791472c169271bbff455">91fa5efa</a></strong>
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<span>by Brandon Chinn</span>
<i>at 2020-07-27T17:36:56-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor tweaks
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<h4>2 changed files:</h4>
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<a href="#3aa56839e36b2219f9ad54f5646ef3005da9c672">
compiler/GHC/Tc/Deriv/Generate.hs
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<a href="#1e112461bfd65ab9492f37fe37931c1d5ddc5c26">
compiler/GHC/Tc/Deriv/Infer.hs
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<h4>Changes:</h4>
<li id="3aa56839e36b2219f9ad54f5646ef3005da9c672">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/91fa5efabb15b2467296791472c169271bbff455#3aa56839e36b2219f9ad54f5646ef3005da9c672"><strong>compiler/GHC/Tc/Deriv/Generate.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">@@ -35,7 +35,7 @@ module GHC.Tc.Deriv.Generate (</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ordOpTbl</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">boxConTbl</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">litConTbl</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkRdrFunBind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkRdrFunBindEC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkRdrFunBindSE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">error_Expr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getPossibleDataCons</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">getTyConArg</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getPossibleDataCons</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">tyConInstArgTy</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2518" 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">@@ -2518,20 +2518,37 @@ newAuxBinderRdrName loc parent occ_fun = do</td>
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Exact</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkSystemNameAt</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">occ_fun</span> <span class="p">(</span><span class="n" style="color: #333;">nameOccName</span> <span class="n" style="color: #333;">parent</span><span class="p">))</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">If we're deriving an instance for a GADT, e.g. `Eq (Foo Int)`, we should treat any constructors</span></span></span>
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">for which it's impossible to match `Foo Int` as not being there at all</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC2521" class="line" lang="haskell"><span class="cd">-- | <span class="idiff left right">@getPossibleDataCons tycon tycon_args@ returns the constructors of @tycon@</span></span></span>
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<pre style="margin: 0;">+<span id="LC2522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">whose return types match when checked against @tycon_args@</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC2523" 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="LC2524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Filter out impossible GADT data constructors]</span></span>
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"><span class="n" style="color: #333;">getPossibleDataCons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">DataCon</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">getPossibleDataCons</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isPossible</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyConDataCons</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"> <span class="n" style="color: #333;">isPossible</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dataConCannotMatch</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">getTyConArg</span>s</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"> <span class="n" style="color: #333;">isPossible</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">dataConCannotMatch</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">tyConInstArgTy</span>s</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"><span class="cd">-- | Get the full list of TyCon args, given a partial instantiation.</span></span>
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cd">-- | Given a type constructor @tycon@ of arity /n/ and a list of argument types</span></span>
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @tycon_args@ of length /m/,</span></span>
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<pre style="margin: 0;"> <span id="LC2532" 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="LC2532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- e.g. Given 'tycon: Foo a b' and 'tycon_args: [Int]', return '[Int, b]'.</span></span>
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<pre style="margin: 0;">-<span id="LC2533" class="line" lang="haskell"><span class="n" style="color: #333;">getTyConArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC2534" class="line" lang="haskell"><span class="n" style="color: #333;">getTyConArgs</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tycon_args_suffix</span></span>
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<pre style="margin: 0;">+<span id="LC2533" 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="LC2534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tyConInstArgTys tycon tycon_args</span></span>
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<pre style="margin: 0;">+<span id="LC2535" 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="LC2536" 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="LC2537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns</span></span>
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2539
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<pre style="margin: 0;">+<span id="LC2539" 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="LC2540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [tycon_arg_{1}, tycon_arg_{2}, ..., tycon_arg_{m}, extra_arg_{m+1}, ..., extra_arg_{n}]</span></span>
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2541
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<pre style="margin: 0;">+<span id="LC2541" 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="LC2542" 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="LC2543" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where @extra_args@ are distinct type variables.</span></span>
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<pre style="margin: 0;">+<span id="LC2544" 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="LC2545" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Examples:</span></span>
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2546
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<pre style="margin: 0;">+<span id="LC2546" 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="LC2547" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Given @tycon: Foo a b@ and @tycon_args: [Int, Bool]@, return @[Int, Bool]@.</span></span>
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2548
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2549
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * Given @tycon: Foo a b@ and @tycon_args: [Int]@, return @[Int, b]@.</span></span>
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2550
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<pre style="margin: 0;">+<span id="LC2550" class="line" lang="haskell"><span class="n" style="color: #333;">tyConInstArgTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2551" class="line" lang="haskell"><span class="n" style="color: #333;">tyConInstArgTys</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">chkAppend</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tycon_args_suffix</span></span>
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2535
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<pre style="margin: 0;"> <span id="LC2552" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2536
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2553
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<pre style="margin: 0;"> <span id="LC2553" class="line" lang="haskell"> <span class="n" style="color: #333;">tycon_args_suffix</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">drop</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">tycon_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tycon</span></span>
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2554
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<pre style="margin: 0;"> <span id="LC2554" 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">@@ -2766,7 +2783,18 @@ data Foo a where</td>
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<pre style="margin: 0;"> <span id="LC2783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2784
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<pre style="margin: 0;"> <span id="LC2784" class="line" lang="haskell"></span>
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2768
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2785
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<pre style="margin: 0;"> <span id="LC2785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when deriving an instance on `Foo Int`, `Y` should be treated as if it didn't</span></span>
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2769
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<pre style="margin: 0;">-<span id="LC2769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exist in the first place.</span></span>
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2786
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<pre style="margin: 0;">+<span id="LC2786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">exist in the first place. For instance, if we write</span></span>
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2787
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<pre style="margin: 0;">+<span id="LC2787" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2789
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<pre style="margin: 0;">+<span id="LC2789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deriving instance Eq (Foo Int)</span></span>
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2790
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<pre style="margin: 0;">+<span id="LC2790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2791
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<pre style="margin: 0;">+<span id="LC2791" class="line" lang="haskell"></span>
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2792
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<pre style="margin: 0;">+<span id="LC2792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it should generate:</span></span>
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<pre style="margin: 0;">+<span id="LC2793" class="line" lang="haskell"></span>
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2794
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<pre style="margin: 0;">+<span id="LC2794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2795
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<pre style="margin: 0;">+<span id="LC2795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance Eq (Foo Int) where</span></span>
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2796
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<pre style="margin: 0;">+<span id="LC2796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> X == X = True</span></span>
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<pre style="margin: 0;">+<span id="LC2797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2798
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<pre style="margin: 0;"> <span id="LC2798" class="line" lang="haskell"></span>
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2799
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<pre style="margin: 0;"> <span id="LC2799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Classes that filter constructors:</span></span>
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2772
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2800
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<pre style="margin: 0;"> <span id="LC2800" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/91fa5efabb15b2467296791472c169271bbff455#1e112461bfd65ab9492f37fe37931c1d5ddc5c26"><strong>compiler/GHC/Tc/Deriv/Infer.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">@@ -260,7 +260,7 @@ inferConstraintsStock (DerivInstTys { dit_cls_tys = cls_tys</td>
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260
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- substitute each type variable with its counterpart in the derived</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instance. rep_tc_args lists each of these counterpart types in</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the same order as the type variables.</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"> <span class="n" style="color: #333;">all_rep_tc_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">getTyConArg</span>s</span> <span class="n" style="color: #333;">rep_tc</span> <span class="n" style="color: #333;">rep_tc_args</span></span>
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"> <span class="n" style="color: #333;">all_rep_tc_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">tyConInstArgTy</span>s</span> <span class="n" style="color: #333;">rep_tc</span> <span class="n" style="color: #333;">rep_tc_args</span></span>
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264
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264
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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="c1" style="color: #998; font-style: italic;">-- Stupid constraints</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="n" style="color: #333;">stupid_constraints</span></span>
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