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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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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db407f3f65783802e8b3f951ee07d54f93dd9379">db407f3f</a></strong>
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<span>by Brandon Chinn</span>
<i>at 2020-07-27T10:35:52-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update note
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8855e414ef2e8edf3599403b10c9a2263569e3b7">8855e414</a></strong>
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<span>by Brandon Chinn</span>
<i>at 2020-07-27T11:12:36-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix getting list of type variables for Functor derivation
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/700f1868b32a6cf081275941e6a9d7a4911605ec">700f1868</a></strong>
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<span>by Brandon Chinn</span>
<i>at 2020-07-27T12:15:25-07:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix test
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<h4>3 changed files:</h4>
<ul>
<li class="file-stats">
<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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<li class="file-stats">
<a href="#43adf67d08cd51216ccbf5dcefe8b5327baa188c">
testsuite/tests/deriving/should_compile/T16341.hs
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<h4>Changes:</h4>
<li id="3aa56839e36b2219f9ad54f5646ef3005da9c672">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/58960da7b7bf446035debddd1fc0b64f2afe68e4...700f1868b32a6cf081275941e6a9d7a4911605ec#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>
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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 class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">getTyConArgs</span></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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2523,7 +2523,17 @@ newAuxBinderRdrName loc parent occ_fun = do</td>
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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="p">(</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="n" style="color: #333;">tycon_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyConDataCons</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">getPossibleDataCons</span> <span class="n" style="color: #333;">tycon</span> <span class="n" style="color: #333;">tycon_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isPossible</span> <span class="o" style="font-weight: 600;">$</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;">getTyConArgs</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="LC2531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2532
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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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2533
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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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2534
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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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2535
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2536
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<pre style="margin: 0;">+<span id="LC2536" 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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2527
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2537
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"></span>
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2528
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2538
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<pre style="margin: 0;"> <span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2529
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2539
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Auxiliary binders]</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">@@ -2747,8 +2757,18 @@ Note [Filter out impossible GADT data constructors]</td>
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2747
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2757
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<pre style="margin: 0;"> <span id="LC2757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2748
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2758
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<pre style="margin: 0;"> <span id="LC2758" class="line" lang="haskell"></span>
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2749
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2759
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<pre style="margin: 0;"> <span id="LC2759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some stock-derivable classes will filter out impossible GADT data constructors,</span></span>
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2750
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<pre style="margin: 0;">-<span id="LC2750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to rule out problematic constructors when deriving instances. Classes that</span></span>
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2751
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<pre style="margin: 0;">-<span id="LC2751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">filter constructors:</span></span>
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2760
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<pre style="margin: 0;">+<span id="LC2760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to rule out problematic constructors when deriving instances. e.g.</span></span>
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2761
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<pre style="margin: 0;">+<span id="LC2761" class="line" lang="haskell"></span>
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2762
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<pre style="margin: 0;">+<span id="LC2762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2763
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<pre style="margin: 0;">+<span id="LC2763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data Foo a where</span></span>
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2764
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<pre style="margin: 0;">+<span id="LC2764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> X :: Foo Int</span></span>
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2765
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<pre style="margin: 0;">+<span id="LC2765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Y :: (Bool -> Bool) -> Foo Bool</span></span>
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2766
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<pre style="margin: 0;">+<span id="LC2766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">```</span></span>
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2767
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<pre style="margin: 0;">+<span id="LC2767" class="line" lang="haskell"></span>
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2768
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<pre style="margin: 0;">+<span id="LC2768" 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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2770
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<pre style="margin: 0;">+<span id="LC2770" class="line" lang="haskell"></span>
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2771
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<pre style="margin: 0;">+<span id="LC2771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Classes that filter constructors:</span></span>
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2752
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2772
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<pre style="margin: 0;"> <span id="LC2772" class="line" lang="haskell"></span>
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2753
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2773
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<pre style="margin: 0;"> <span id="LC2773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Eq</span></span>
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2754
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2774
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<pre style="margin: 0;"> <span id="LC2774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Ord</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">@@ -2765,8 +2785,9 @@ Classes that do not filter constructors:</td>
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2765
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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;">* Ix: only makes sense for GADTs with a single constructor</span></span>
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2766
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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;">* Read: `Read a` returns `a` instead of consumes `a`, so filtering data</span></span>
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2767
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2787
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<pre style="margin: 0;"> <span id="LC2787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructors would make this function _more_ partial instead of less</span></span>
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2768
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<pre style="margin: 0;">-<span id="LC2768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Data: uses `tagToEnum` to pick the constructor, which could reference</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;"> the incorrect constructors if we filter out constructors</span></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;">* Data: derived implementations of gunfold rely on a constructor-indexing</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;"> scheme that wouldn't work if certain constructors were filtered out</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;">* Generic/Generic1: doesn't make sense for GADTs</span></span>
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2770
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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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2771
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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;">Classes that do not currently filter constructors may do so in the future, if</span></span>
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2772
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2793
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<pre style="margin: 0;"> <span id="LC2793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there is a valid use-case and we have requirements for how they should work.</span></span>
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<li id="1e112461bfd65ab9492f37fe37931c1d5ddc5c26">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/58960da7b7bf446035debddd1fc0b64f2afe68e4...700f1868b32a6cf081275941e6a9d7a4911605ec#1e112461bfd65ab9492f37fe37931c1d5ddc5c26"><strong>compiler/GHC/Tc/Deriv/Infer.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="260" 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">@@ -260,9 +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>
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<pre style="margin: 0;">-<span id="LC264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rep_tc_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>
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"> <span class="p">(</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;">rep_tc_args</span><span class="p">)</span> <span class="n" style="color: #333;">rep_tc_tvs</span><span class="p">)</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;">getTyConArgs</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="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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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/58960da7b7bf446035debddd1fc0b64f2afe68e4...700f1868b32a6cf081275941e6a9d7a4911605ec#43adf67d08cd51216ccbf5dcefe8b5327baa188c"><strong>testsuite/tests/deriving/should_compile/T16341.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">@@ -8,6 +8,8 @@</td>
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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;">module</span> <span class="nn" style="color: #555;">T16341</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">Language.Haskell.TH.Syntax</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Lift</span><span class="p">)</span></span>
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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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</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="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Foo1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Foo2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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