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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/1bc50b8c6b188870734ec49ab2edd51f734986a6">1bc50b8c</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-10-25T07:25:16-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Restore Note that I accidentally deleted
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<h4>1 changed file:</h4>
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<h4>Changes:</h4>
<li id="83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bc50b8c6b188870734ec49ab2edd51f734986a6#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">@@ -3310,6 +3310,7 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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3310
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<pre style="margin: 0;"> <span id="LC3310" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsMbContext</span> <span class="n" style="color: #333;">cxt</span></span>
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<pre style="margin: 0;"> <span id="LC3311" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">btys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConArgs</span> <span class="n" style="color: #333;">hs_args</span></span>
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<pre style="margin: 0;"> <span id="LC3312" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferLHsTypeKind</span> <span class="n" style="color: #333;">hs_res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3313" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [GADT return kinds]</span></span>
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<pre style="margin: 0;"> <span id="LC3314" 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;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">stricts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="n" style="color: #333;">btys</span></span>
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<pre style="margin: 0;"> <span id="LC3315" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC3316" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">final_arg_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyNewtypeKind</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">new_or_data</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3369" 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">@@ -3368,6 +3369,20 @@ tcConDecl rep_tycon tag_map tmpl_bndrs _res_kind res_tmpl new_or_data</td>
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<pre style="margin: 0;"> <span id="LC3369" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC3370" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DataConSkol</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">names</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC3371" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [GADT return kinds]</span></span>
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<pre style="margin: 0;">+<span id="LC3373" 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="LC3374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">+<span id="LC3375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Star where Star = Type</span></span>
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<pre style="margin: 0;">+<span id="LC3376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T :: Type where</span></span>
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<pre style="margin: 0;">+<span id="LC3377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: Int -> T</span></span>
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<pre style="margin: 0;">+<span id="LC3378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If, for some stupid reason, tcInferLHsTypeKind on the return type of</span></span>
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<pre style="margin: 0;">+<span id="LC3380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">MkT returned (T |> ax, Star), then the return-type check in</span></span>
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3381
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<pre style="margin: 0;">+<span id="LC3381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checkValidDataCon would reject the decl (although of course there is</span></span>
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3382
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<pre style="margin: 0;">+<span id="LC3382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nothing wrong with it). We are implicitly requiring tha</span></span>
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3383
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<pre style="margin: 0;">+<span id="LC3383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcInferLHsTypeKind doesn't any gratuitous top-level casts.</span></span>
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3384
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<pre style="margin: 0;">+<span id="LC3384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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3385
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<pre style="margin: 0;">+<span id="LC3385" class="line" lang="haskell"></span>
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3371
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3386
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<pre style="margin: 0;"> <span id="LC3386" class="line" lang="haskell"><span class="n" style="color: #333;">tcConIsInfixH98</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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3372
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3387
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<pre style="margin: 0;"> <span id="LC3387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HsConDetails</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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3373
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<pre style="margin: 0;"> <span id="LC3388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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