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<h3>
Adam Gundry pushed to branch wip/amg/hasfield-2020
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/f0c0b6eec1a139f1e2e918e3aea5161f2d172b22">f0c0b6ee</a></strong>
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<span>by Adam Gundry</span>
<i>at 2020-10-02T21:55:45+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generate alternative form of updaters that are faster to typecheck
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18968fd1a25769ae82ba5ae7709f88885560a8a8">18968fd1</a></strong>
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<span>by Adam Gundry</span>
<i>at 2020-10-02T21:56:07+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Alternative (arguably better) error for partial setField
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<h4>2 changed files:</h4>
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<a href="#5ed3ecf19a26af612b8100b2639f8e153f580fe9">
compiler/GHC/Tc/TyCl/Utils.hs
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<a href="#c7c2209892c0096f460e99e5b3c04ffe016ed85d">
testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stderr
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<h4>Changes:</h4>
<li id="5ed3ecf19a26af612b8100b2639f8e153f580fe9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/573631554d1dbc6c648314a10695b6a553a8861a...18968fd1a25769ae82ba5ae7709f88885560a8a8#5ed3ecf19a26af612b8100b2639f8e153f580fe9"><strong>compiler/GHC/Tc/TyCl/Utils.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">@@ -993,13 +993,44 @@ mkRecordSelectorAndUpdater all_cons idDetails fl x_vars y_var =</td>
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993
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993
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<pre style="margin: 0;"> <span id="LC993" class="line" lang="haskell"> <span class="n" style="color: #333;">field_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="p">(</span><span class="n" style="color: #333;">mkBuiltinUnique</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">sel_name</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span></span>
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994
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994
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<pre style="margin: 0;"> <span id="LC994" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_expr</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">field_var</span><span class="p">))</span></span>
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995
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995
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make a binding for the updater. We prefer to use upd_bind_fast, but</span></span>
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997
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- thanks to #2595 this does not work for some GADTs, so we fall back on</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd_bind_slow.</span></span>
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"> <span class="n" style="color: #333;">upd_bind</span></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">conLikeExTyCoVars</span> <span class="n" style="color: #333;">con1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upd_bind_fast</span></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upd_bind_slow</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the binding:</span></span>
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd x = (\ y -> x { fld = y }, fld x)</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" 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="LC1006" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: this implementation needs cleaning up</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">upd_bind_fast</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkTopFunBind</span> <span class="kt" style="color: #458; font-weight: 600;">Generated</span> <span class="n" style="color: #333;">lname</span> <span class="p">[</span><span class="n" style="color: #333;">alt</span><span class="p">])</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"> <span class="n" style="color: #333;">lname</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">name</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="n" style="color: #333;">alt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSimpleMatch</span> <span class="p">(</span><span class="n" style="color: #333;">mkPrefixFunRhs</span> <span class="n" style="color: #333;">lname</span><span class="p">)</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">x_var</span> <span class="n" style="color: #333;">fl</span><span class="p">)))]</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkLHsTupleExpr</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mkHsLam</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarPat</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">y_var</span><span class="p">))]</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RecordUpd</span> <span class="n" style="color: #333;">noExtField</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">x_var</span> <span class="n" style="color: #333;">fl</span><span class="p">))))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1016" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">afo</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">y_var</span><span class="p">)))</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)]</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="p">))</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkHsApp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="n" style="color: #333;">noExtField</span> <span class="n" style="color: #333;">afo</span><span class="p">))</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">x_var</span> <span class="n" style="color: #333;">fl</span><span class="p">))))</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"> <span class="p">])</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">afo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Unambiguous</span> <span class="n" style="color: #333;">sel_name</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarUnqual</span> <span class="p">(</span><span class="n" style="color: #333;">flLabel</span> <span class="n" style="color: #333;">fl</span><span class="p">)))</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"></span>
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996
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make the binding:</span></span>
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997
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd (C2 { fld1 = x1, .., fldN = xN })</span></span>
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998
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- = (\ y -> C2 { fld1 = y, fld2 = x2, .., fldN = xN }, x1)</span></span>
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999
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd (C7 { fld1 = x1, .., fldM = xM })</span></span>
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1000
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- = (\ y -> C7 { fld1 = y, fld3 = x3, .., fldM = xM }, x1)</span></span>
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1001
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1029
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<pre style="margin: 0;"> <span id="LC1029" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where cons_w_field = [C2,C7] and fld1 is being selected/updated</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">upd_bind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">the_bind</span> <span class="n" style="color: #333;">mk_rec_flds</span> <span class="n" style="color: #333;">mk_expr</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: we should probably be more consistent with upd_bind_fast and generate</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd x = ((\ y -> case x of { c@C2 { fld1 = x1 } -> c { fld1 = y } ; ... }), fld1 x)</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"> <span class="n" style="color: #333;">upd_bind_slow</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">the_bind</span> <span class="n" style="color: #333;">mk_rec_flds</span> <span class="n" style="color: #333;">mk_expr</span></span>
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1003
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1004
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Pattern that matches { fld1 = x1, .., fldN = xN }</span></span>
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1005
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_rec_flds</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rec_flds</span> <span class="p">(</span><span class="n" style="color: #333;">rec_fields</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">pat_var</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1041" 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>
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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">@@ -1041,10 +1072,10 @@ mkRecordSelectorAndUpdater all_cons idDetails fl x_vars y_var =</td>
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1041
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="n" style="color: #333;">field_occ</span> <span class="n" style="color: #333;">fl'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FieldOcc</span> <span class="p">(</span><span class="n" style="color: #333;">flSelector</span> <span class="n" style="color: #333;">fl'</span><span class="p">)</span></span>
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1042
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1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarUnqual</span> <span class="p">(</span><span class="n" style="color: #333;">flLabel</span> <span class="n" style="color: #333;">fl'</span><span class="p">)))</span></span>
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1043
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- The x_vars NameEnv contains a fresh name for every selector name in the</span></span>
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1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- TyCon, i.e. maps fldN to xN.</span></span>
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1046
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<pre style="margin: 0;">-<span id="LC1046" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">x_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FieldLbl</span> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Name</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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1047
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">x_var</span> <span class="n" style="color: #333;">fl'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupNameEnv_NF</span> <span class="n" style="color: #333;">x_vars</span> <span class="p">(</span><span class="n" style="color: #333;">flSelector</span> <span class="n" style="color: #333;">fl'</span><span class="p">)</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The x_vars NameEnv contains a fresh name for every selector name in the</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TyCon, i.e. maps fldN to xN.</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"> <span class="n" style="color: #333;">x_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FieldLbl</span> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Name</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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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"> <span class="n" style="color: #333;">x_var</span> <span class="n" style="color: #333;">fl'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupNameEnv_NF</span> <span class="n" style="color: #333;">x_vars</span> <span class="p">(</span><span class="n" style="color: #333;">flSelector</span> <span class="n" style="color: #333;">fl'</span><span class="p">)</span></span>
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1048
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1079
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"></span>
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1049
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add catch-all default case unless the case is exhaustive</span></span>
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1050
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We do this explicitly so that we get a nice error message that</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/573631554d1dbc6c648314a10695b6a553a8861a...18968fd1a25769ae82ba5ae7709f88885560a8a8#c7c2209892c0096f460e99e5b3c04ffe016ed85d"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">hasfieldrun01: No match in record selector partial</span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">hasfieldrun01: hasfieldrun01.hs:33:17-23: Non-exhaustive patterns in record update</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"></span></pre>
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