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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/b55cf28534eaef254c16da050f5e63dc3ff6d7af">b55cf285</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-10-26T07:18:00-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">tcConArgs: Only typecheck each record type once
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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/b55cf28534eaef254c16da050f5e63dc3ff6d7af#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">@@ -3413,18 +3413,22 @@ tcConArgs (InfixCon bty1 bty2)</td>
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<pre style="margin: 0;"> <span id="LC3413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">bty1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConArg</span> <span class="n" style="color: #333;">bty1</span></span>
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<pre style="margin: 0;"> <span id="LC3414" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConArg</span> <span class="n" style="color: #333;">bty2</span></span>
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<pre style="margin: 0;"> <span id="LC3415" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">bty1'</span><span class="p">,</span> <span class="n" style="color: #333;">bty2'</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC3416" class="line" lang="haskell"><span class="n" style="color: #333;">tcConArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="n" style="color: #333;"><span class="idiff left right">fields</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">mapM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcConArg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bty</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC3416" class="line" lang="haskell"><span class="n" style="color: #333;">tcConArgs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecCon</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">L</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fields</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC3417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">concatMapM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc_field</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">field</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC3418" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC3419" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to ensure that each distinct field name gets its own type.</span></span>
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<pre style="margin: 0;"> <span id="LC3420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For example, if we have:</span></span>
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<pre style="margin: 0;"> <span id="LC3421" 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="LC3422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data T = MkT { a,b,c :: Int }</span></span>
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<pre style="margin: 0;"> <span id="LC3423" 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="LC3424" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we should return /three/ Int types, not just one!</span></span>
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<pre style="margin: 0;">-<span id="LC3425" class="line" lang="haskell"> <span class="n" style="color: #333;">btys</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="n" style="color: #333;">hsLinear</span> <span class="p">(</span><span class="n" style="color: #333;">cd_fld_type</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3426" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">fields</span></span>
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<pre style="margin: 0;">-<span id="LC3427" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">_fld_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cd_fld_names</span> <span class="n" style="color: #333;">f</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC3424" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we should return /three/ Int types, not just one! At the same</span></span>
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<pre style="margin: 0;">+<span id="LC3425" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- time, we don't want to kind-check Int three separate times, as that</span></span>
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<pre style="margin: 0;">+<span id="LC3426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- would be redundant. Therefore, we kind-check Int once and 'replicate'</span></span>
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<pre style="margin: 0;">+<span id="LC3427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it so that we return three occurrences of it.</span></span>
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3428
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<pre style="margin: 0;">+<span id="LC3428" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_field</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LConDeclField</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsSrcBang</span><span class="p">)]</span></span>
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3429
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<pre style="margin: 0;">+<span id="LC3429" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_field</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">f</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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3430
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<pre style="margin: 0;">+<span id="LC3430" class="line" lang="haskell"> <span class="n" style="color: #333;">bty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcConArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsLinear</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">cd_fld_type</span> <span class="n" style="color: #333;">f</span></span>
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3431
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<pre style="margin: 0;">+<span id="LC3431" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">replicate</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="p">(</span><span class="n" style="color: #333;">cd_fld_names</span> <span class="n" style="color: #333;">f</span><span class="p">))</span> <span class="n" style="color: #333;">bty'</span></span>
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3428
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3432
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<pre style="margin: 0;"> <span id="LC3432" class="line" lang="haskell"></span>
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3429
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<pre style="margin: 0;"> <span id="LC3433" class="line" lang="haskell"><span class="n" style="color: #333;">tcConArg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsScaled</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsSrcBang</span><span class="p">)</span></span>
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3434
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<pre style="margin: 0;"> <span id="LC3434" class="line" lang="haskell"><span class="n" style="color: #333;">tcConArg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsScaled</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">bty</span><span class="p">)</span></span>
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