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<h3>
Simon Peyton Jones pushed to branch wip/T18120
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/a47b226c654d0125596f5f0c90b4958128aa558c">a47b226c</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-05-01T15:18:41+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix specialisation for DFuns
When specialising a DFun we must take care to saturate the
unfolding. See Note [Specialising DFuns] in Specialise.
Fixes #18120
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<h4>6 changed files:</h4>
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<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<li class="file-stats">
<a href="#2811a7297b8aa206197ac1f5dabd0818e3c7ec5a">
compiler/GHC/Core/Unfold.hs
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<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
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<li class="file-stats">
<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
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<a href="#05aba2c695e8e684f6f1a4a5c10de5a19175ceea">
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+
testsuite/tests/simplCore/should_compile/T18120.hs
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<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<h4>Changes:</h4>
<li id="ab22d7ae4d245581b701367e386d7e886e416e76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#ab22d7ae4d245581b701367e386d7e886e416e76"><strong>compiler/GHC/Core/Opt/Specialise.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1362" 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">@@ -1362,6 +1362,7 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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<pre style="margin: 0;"> <span id="LC1362" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_prag</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idInlinePragma</span> <span class="n" style="color: #333;">fn</span></span>
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<pre style="margin: 0;"> <span id="LC1363" class="line" lang="haskell"> <span class="n" style="color: #333;">inl_act</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inlinePragmaActivation</span> <span class="n" style="color: #333;">inl_prag</span></span>
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"> <span class="n" style="color: #333;">is_local</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isLocalId</span> <span class="n" style="color: #333;">fn</span></span>
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<pre style="margin: 0;">+<span id="LC1365" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dfun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDFunId</span> <span class="n" style="color: #333;">fn</span></span>
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1365
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1366
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1367" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Figure out whether the function has an INLINE pragma</span></span>
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Inline specialisations]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1384" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1385" 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">@@ -1384,22 +1385,34 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1384
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_call</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- Accumulating parameter</span></span>
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<pre style="margin: 0;"> <span id="LC1386" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CallInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- Call instance</span></span>
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SpecM</span> <span class="kt" style="color: #458; font-weight: 600;">SpecInfo</span></span>
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<pre style="margin: 0;">-<span id="LC1387" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_call</span> <span class="n" style="color: #333;">spec_acc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">rules_acc</span><span class="p">,</span> <span class="n" style="color: #333;">pairs_acc</span><span class="p">,</span> <span class="n" style="color: #333;">uds_acc</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CI</span> <span class="p">{</span> <span class="n" style="color: #333;">ci_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">call_args</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1388" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_call</span> <span class="n" style="color: #333;">spec_acc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">rules_acc</span><span class="p">,</span> <span class="n" style="color: #333;">pairs_acc</span><span class="p">,</span> <span class="n" style="color: #333;">uds_acc</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left">ci</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">@</span></span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CI</span> <span class="p">{</span> <span class="n" style="color: #333;">ci_key</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">call_args</span> <span class="p">})</span></span>
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1388
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<pre style="margin: 0;"> <span id="LC1389" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising Calls]</span></span>
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<pre style="margin: 0;">-<span id="LC1389" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span> <span class="n" style="color: #333;">useful</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_env2</span><span class="p">,</span> <span class="n" style="color: #333;">leftover_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC1390" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_call_args</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_dfun</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">call_args</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">UnspecArg</span></span>
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<pre style="margin: 0;">+<span id="LC1391" 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;">call_args</span></span>
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<pre style="margin: 0;">+<span id="LC1392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising DFuns]</span></span>
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<pre style="margin: 0;">+<span id="LC1393" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span> <span class="n" style="color: #333;">useful</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_env2</span><span class="p">,</span> <span class="n" style="color: #333;">leftover_bndrs</span></span>
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1390
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rule_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rule_lhs_args</span></span>
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1391
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">spec_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">dx_binds</span><span class="p">,</span> <span class="n" style="color: #333;">spec_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specHeader</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">call_args</span></span>
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">spec_bndrs1</span><span class="p">,</span> <span class="n" style="color: #333;">dx_binds</span><span class="p">,</span> <span class="n" style="color: #333;">spec_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specHeader</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rhs_bndrs</span> <span class="n" style="color: #333;">all_call_args</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ; pprTrace "spec_call" (vcat [ text "call info: " <+> ppr ci</span></span>
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1398
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<pre style="margin: 0;">+<span id="LC1398" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "useful: " <+> ppr useful</span></span>
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1399
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<pre style="margin: 0;">+<span id="LC1399" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "rule_bndrs:" <+> ppr rule_bndrs</span></span>
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1400
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<pre style="margin: 0;">+<span id="LC1400" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "lhs_args: " <+> ppr rule_lhs_args</span></span>
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1401
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "spec_bndrs:" <+> ppr spec_bndrs1</span></span>
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1402
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<pre style="margin: 0;">+<span id="LC1402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "spec_args: " <+> ppr spec_args</span></span>
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1403
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<pre style="margin: 0;">+<span id="LC1403" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "dx_binds: " <+> ppr dx_binds</span></span>
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1404
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<pre style="margin: 0;">+<span id="LC1404" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , text "rhs_env2: " <+> ppr (se_subst rhs_env2)</span></span>
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1405
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<pre style="margin: 0;">+<span id="LC1405" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , ppr dx_binds ]) $</span></span>
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1406
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<pre style="margin: 0;">+<span id="LC1406" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- return ()</span></span>
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1392
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"></span>
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1393
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1408
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<pre style="margin: 0;"> <span id="LC1408" 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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1394
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1409
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">useful</span> <span class="c1" style="color: #998; font-style: italic;">-- No useful specialisation</span></span>
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1395
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1410
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">already_covered</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">rules_acc</span> <span class="n" style="color: #333;">rule_lhs_args</span></span>
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1396
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1411
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">spec_acc</span></span>
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1397
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<pre style="margin: 0;">-<span id="LC1397" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="c1" style="color: #998; font-style: italic;">-- pprTrace "spec_call" (vcat [ ppr _call_info, ppr fn, ppr rhs_dict_ids</span></span>
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<pre style="margin: 0;">-<span id="LC1398" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , text "rhs_env2" <+> ppr (se_subst rhs_env2)</span></span>
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1399
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<pre style="margin: 0;">-<span id="LC1399" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , ppr dx_binds ]) $</span></span>
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1412
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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1400
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Run the specialiser on the specialised RHS</span></span>
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1401
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1414
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The "1" suffix is before we maybe add the void arg</span></span>
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1402
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<pre style="margin: 0;">-<span id="LC1402" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rhs1</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specLam</span> <span class="n" style="color: #333;">rhs_env2</span> <span class="p">(</span><span class="n" style="color: #333;">spec_bndrs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">leftover_bndrs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_body</span></span>
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1415
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<pre style="margin: 0;">+<span id="LC1415" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">spec_rhs1</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_uds</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">specLam</span> <span class="n" style="color: #333;">rhs_env2</span> <span class="p">(</span><span class="n" style="color: #333;">spec_bndrs<span class="idiff left right">1</span></span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">leftover_bndrs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs_body</span></span>
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1403
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1416
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">spec_fn_ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">exprType</span> <span class="n" style="color: #333;">spec_rhs1</span></span>
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1404
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"></span>
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maybe add a void arg to the specialised function,</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">@@ -1407,14 +1420,13 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1407
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialisations Must Be Lifted]</span></span>
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1408
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- C.f. GHC.Core.Opt.WorkWrap.Utils.mkWorkerArgs</span></span>
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1409
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"> <span class="n" style="color: #333;">add_void_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isUnliftedType</span> <span class="n" style="color: #333;">spec_fn_ty1</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span></span>
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1410
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<pre style="margin: 0;">-<span id="LC1410" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">spec_rhs</span><span class="p">,</span> <span class="n" style="color: #333;">spec_fn_ty</span><span class="p">,</span> <span class="n" style="color: #333;">rule_rhs_args</span><span class="p">)</span></span>
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1411
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<pre style="margin: 0;">-<span id="LC1411" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">add_void_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">voidArgId</span> <span class="n" style="color: #333;">spec_rhs1</span></span>
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1412
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<pre style="margin: 0;">-<span id="LC1412" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">voidPrimTy</span> <span class="n" style="color: #333;">spec_fn_ty1</span></span>
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1413
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<pre style="margin: 0;">-<span id="LC1413" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">voidPrimId</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">spec_bndrs</span><span class="p">)</span></span>
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1414
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<pre style="margin: 0;">-<span id="LC1414" 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="p">(</span><span class="n" style="color: #333;">spec_rhs1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_fn_ty1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_bndrs</span><span class="p">)</span></span>
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1415
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<pre style="margin: 0;">-<span id="LC1415" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_decr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isValArg</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">rule_rhs_args</span></span>
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1417
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"> <span class="n" style="color: #333;">join_arity_decr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rule_rhs_args</span></span>
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1423
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">spec_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">spec_rhs</span><span class="p">,</span> <span class="n" style="color: #333;">spec_fn_ty</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1424" 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">
1424
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">add_void_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="n" style="color: #333;">voidPrimId</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">spec_bndrs1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1425" 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">
1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Lam</span> <span class="n" style="color: #333;">voidArgId</span> <span class="n" style="color: #333;">spec_rhs1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1426" 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">
1426
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">voidPrimTy</span> <span class="n" style="color: #333;">spec_fn_ty1</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1427" 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">
1427
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<pre style="margin: 0;">+<span id="LC1427" 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="p">(</span><span class="n" style="color: #333;">spec_bndrs1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_rhs1</span><span class="p">,</span> <span class="n" style="color: #333;">spec_fn_ty1</span><span class="p">)</span></span>
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1428
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<pre style="margin: 0;">+<span id="LC1428" class="line" lang="haskell"></span>
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1429
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<pre style="margin: 0;">+<span id="LC1429" class="line" lang="haskell"> <span class="n" style="color: #333;">join_arity_decr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">spec_bndrs</span></span>
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1418
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1430
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_join_arity</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">orig_join_arity</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">fn</span></span>
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1419
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1431
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<pre style="margin: 0;"> <span id="LC1431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">orig_join_arity</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">join_arity_decr</span><span class="p">)</span></span>
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1420
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1432
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<pre style="margin: 0;"> <span id="LC1432" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1449" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1461" 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">@@ -1449,7 +1461,7 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1449
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1461
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<pre style="margin: 0;"> <span id="LC1461" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">fn</span><span class="p">)</span></span>
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1450
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1462
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_bndrs</span></span>
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1451
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_lhs_args</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkVarApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">spec_fn</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">rule_rhs_arg</span>s</span><span class="p">)</span></span>
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1464
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkVarApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">spec_fn</span><span class="p">)</span> <span class="n" style="color: #333;"><span class="idiff left right">spec_bndr</span>s</span><span class="p">)</span></span>
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1453
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1465
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"></span>
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1454
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_rule</span></span>
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1455
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">isJoinId_maybe</span> <span class="n" style="color: #333;">fn</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1472" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1484" 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">@@ -1472,15 +1484,15 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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1472
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inl_prag</span> <span class="p">{</span> <span class="n" style="color: #333;">inl_inline</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoUserInline</span> <span class="p">},</span> <span class="n" style="color: #333;">noUnfolding</span><span class="p">)</span></span>
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1485
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<pre style="margin: 0;"> <span id="LC1485" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inl_prag</span><span class="p">,</span> <span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="n" style="color: #333;">spec_app</span> <span class="n" style="color: #333;">arity_decr</span> <span class="n" style="color: #333;">fn_unf</span><span class="p">)</span></span>
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1476
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<pre style="margin: 0;">-<span id="LC1476" class="line" lang="haskell"></span>
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1477
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_app</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">e</span> <span class="p">`</span><span class="n" style="color: #333;">mkApps</span><span class="p">`</span> <span class="n" style="color: #333;">spec_args</span></span>
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inl_prag</span><span class="p">,</span> <span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="p">(`</span><span class="n" style="color: #333;">mkApps</span><span class="p">`</span> <span class="n" style="color: #333;">spec_args</span><span class="p">)</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="n" style="color: #333;">fn_unf</span><span class="p">)</span></span>
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1478
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1489
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<pre style="margin: 0;"> <span id="LC1489" class="line" lang="haskell"></span>
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1479
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1490
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<pre style="margin: 0;"> <span id="LC1490" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------------------------</span></span>
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1480
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1491
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<pre style="margin: 0;"> <span id="LC1491" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Adding arity information just propagates it a bit faster</span></span>
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1481
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<pre style="margin: 0;"> <span id="LC1492" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Arity decrease] in GHC.Core.Opt.Simplify</span></span>
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1482
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1493
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<pre style="margin: 0;"> <span id="LC1493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Copy InlinePragma information from the parent Id.</span></span>
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1483
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1494
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So if f has INLINE[1] so does spec_fn</span></span>
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<pre style="margin: 0;">+<span id="LC1495" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_decr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isValArg</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">spec_bndrs</span></span>
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1484
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_f_w_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">spec_fn</span> <span class="p">`</span><span class="n" style="color: #333;">setIdArity</span><span class="p">`</span> <span class="n" style="color: #333;">max</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">fn_arity</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">arity_decr</span><span class="p">)</span></span>
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1497
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<pre style="margin: 0;"> <span id="LC1497" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setInlinePragma</span><span class="p">`</span> <span class="n" style="color: #333;">spec_inl_prag</span></span>
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1498
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">spec_unf</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">@@ -1498,8 +1510,19 @@ specCalls mb_mod env existing_rules calls_for_me fn rhs</td>
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">spec_uds</span> <span class="p">`</span><span class="n" style="color: #333;">plusUDs</span><span class="p">`</span> <span class="n" style="color: #333;">uds_acc</span></span>
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Specialisation Must Preserve Sharing]</span></span>
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1502
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<pre style="margin: 0;">-<span id="LC1502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Specialising DFuns]</span></span>
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1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">DFuns have a special sort of unfolding (DFunUnfolding), and these are</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">hard to specialise a DFunUnfolding to give another DFunUnfolding</span></span>
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1517
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unless the DFun is fully applied (#18120). So, in the case of DFunIds</span></span>
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1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we simply extend the CallKey with trailing UnspecArgs, so we'll</span></span>
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1519
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<pre style="margin: 0;">+<span id="LC1519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generate a rule that completely saturates the DFun.</span></span>
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1520
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"></span>
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1521
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is an ASSERT that checks this, in the DFunUnfolding case of</span></span>
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1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Core.Unfold.specUnfolding.</span></span>
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1523
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"></span>
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1524
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Specialisation Must Preserve Sharing]</span></span>
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1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1503
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider a function:</span></span>
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1504
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1527
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"></span>
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1505
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. Eq a => a -> blah</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2089" 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="diff-line-num unfold js-unfold new_line" data-linenumber="2112" 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">@@ -2089,7 +2112,7 @@ isSpecDict _ = False</td>
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2089
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2112
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -- Specialised function helpers</span></span>
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2090
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , [c, i, x]</span></span>
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2091
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2114
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , [dShow1 = $dfShow dShowT2]</span></span>
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2092
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<pre style="margin: 0;">-<span id="LC2092" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , [T1, T2, dEqT1, dShow1]</span></span>
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2115
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<pre style="margin: 0;">+<span id="LC2115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , [T1, T2, <span class="idiff left right">c, i, </span>dEqT1, dShow1]</span></span>
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2093
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2116
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- )</span></span>
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2094
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2117
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"><span class="n" style="color: #333;">specHeader</span></span>
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2118
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SpecEnv</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">@@ -2106,12 +2129,13 @@ specHeader</td>
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2106
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2129
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<pre style="margin: 0;"> <span id="LC2129" class="line" lang="haskell"></span>
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2107
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2130
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<pre style="margin: 0;"> <span id="LC2130" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- RULE helpers</span></span>
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2108
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2131
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<pre style="margin: 0;"> <span id="LC2131" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OutBndr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders for the RULE</span></span>
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2109
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<pre style="margin: 0;">-<span id="LC2109" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CoreArg</span></span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Args for the LHS of the rule</span></span>
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2132
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">OutExpr</span></span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Args for the LHS of the rule</span></span>
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2110
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2133
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<pre style="margin: 0;"> <span id="LC2133" class="line" lang="haskell"></span>
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2111
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2134
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<pre style="margin: 0;"> <span id="LC2134" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specialised function helpers</span></span>
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2112
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2135
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<pre style="margin: 0;"> <span id="LC2135" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OutBndr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Binders for $sf</span></span>
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2113
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2136
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">DictBind</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Auxiliary dictionary bindings</span></span>
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2114
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2137
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">OutExpr</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Specialised arguments for unfolding</span></span>
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Same length as "args for LHS of rule"</span></span>
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2115
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2139
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<pre style="margin: 0;"> <span id="LC2139" class="line" lang="haskell"> <span class="p">)</span></span>
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2140
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<pre style="margin: 0;"> <span id="LC2140" class="line" lang="haskell"></span>
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2141
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<pre style="margin: 0;"> <span id="LC2141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We want to specialise on type 'T1', and so we must construct a substitution</span></span>
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<li id="2811a7297b8aa206197ac1f5dabd0818e3c7ec5a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#2811a7297b8aa206197ac1f5dabd0818e3c7ec5a"><strong>compiler/GHC/Core/Unfold.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">@@ -173,47 +173,47 @@ mkInlinableUnfolding dflags expr</td>
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173
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">expr</span></span>
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</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;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Arity</span></span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</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;">CoreExpr</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreExpr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoreArg</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS arguments in the RULE</span></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unfolding</span></span>
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178
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising unfoldings]</span></span>
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- specUnfolding spec_bndrs spec_a<span class="idiff left right">pp arity_decrease</span> unf</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = \spec_bndrs. <span class="idiff left right">spec_app( unf )</span></span></span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- specUnfolding spec_bndrs spec_a<span class="idiff left right">rgs</span> unf</span></span>
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- = \spec_bndrs. <span class="idiff left right">unf spec_args</span></span></span>
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<pre style="margin: 0;"> <span id="LC183" 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="LC182" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">fn</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arity_decrease</span></span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rule_lhs_args</span></span></span>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell"> <span class="n" style="color: #333;">df</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DFunUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">df_bndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">df_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">con</span><span class="p">,</span> <span class="n" style="color: #333;">df_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">args</span> <span class="p">})</span></span>
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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">arity_decrease</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">old_bndrs</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">spec_bndrs</span></span>
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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">df</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">spec_app</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">fn</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">arity_decrease</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">old_bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">df</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rule_lhs_args</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For this ASSERT see Note [DFunUnfoldings] in GHC.Core.Opt.Specialise</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="n" style="color: #333;">mkDFunUnfolding</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="n" style="color: #333;">con</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">spec_arg</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There is a hard-to-check assumption here that the spec_app has</span></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- enough applications to exactly saturate the old_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For DFunUnfoldings we transform</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- \o<span class="idiff left right">ld_bndr</span>s. MkD <op1> ... <opn></span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- \o<span class="idiff left right">b</span>s. MkD <op1> ... <opn></span></span>
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191
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to</span></span>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- \new_bndrs. MkD (spec_app(\old_bndrs. <op1>)) ... ditto <opn></span></span>
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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The ASSERT checks the value part of that</span></span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- \sbs. MkD ((\obs. <op1>) spec_args) ... ditto <opn></span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_arg</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">dflags</span> <span class="p">(</span><span class="n" style="color: #333;">spec_app</span> <span class="p">(</span><span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">old_bndrs</span> <span class="n" style="color: #333;">arg</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_arg</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simpleOptExpr</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_app</span> <span class="p">(</span><span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">old_bndrs</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The beta-redexes created by spec_app will be</span></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- simplified away by simplOptExpr</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arity_decrease</span></span></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rule_lhs_args</span></span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoreUnfolding</span> <span class="p">{</span> <span class="n" style="color: #333;">uf_src</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">src</span><span class="p">,</span> <span class="n" style="color: #333;">uf_tmpl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tmpl</span></span>
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uf_is_top</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">top_lvl</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">uf_guidance</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_guidance</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isStableSource</span> <span class="n" style="color: #333;">src</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Specialising unfoldings]</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UnfWhen</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_arity</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_unsat_ok</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unsat_ok</span></span></span>
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206
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_boring_ok</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">boring_ok</span></span><span class="idiff"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">old_guidance</span></span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">guidance</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">UnfWhen</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arity_decreas</span>e</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_unsat_ok</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">unsat_ok</span></span></span>
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209
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_boring_ok</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">boring_ok</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">new_tmpl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpleOptExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkLams</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_bndrs</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tmpl</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- The beta-redexes created by spec_app will be</span></span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- simplified away by simplOptExpr</span></span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UnfWhen</span> <span class="p">{</span> <span class="n" style="color: #333;">ug_arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_arity</span><span class="idiff left"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">old_guidance</span></span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkCoreUnfolding</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">src</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">top_lvl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">new_tmpl</span></span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">old_guidance</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ug_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_arity</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arity_decrease</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left right">wher</span>e</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">new_tmpl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simpleOptExpr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">mkLams</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_bndrs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">spec_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tmpl</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- The beta-redexes created by spec_app</span></span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- will besimplified away by simplOptExpr</span></span></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">arity_decrease</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">count</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isValArg</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rule_lhs_args</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">count</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isId</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">spec_bndrs</span></span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">mkCoreUnfolding</span> <span class="n" style="color: #333;">src</span> <span class="n" style="color: #333;">top_lvl</span> <span class="n" style="color: #333;">new_tmpl</span> <span class="n" style="color: #333;">guidance</span></span>
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noUnfolding</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="n" style="color: #333;">specUnfolding</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noUnfolding</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Specialising unfoldings]</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.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">@@ -694,20 +694,19 @@ dsSpec mb_poly_rhs (L loc (SpecPrag poly_id spec_co spec_inl))</td>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <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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695
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">decomposeRuleLhs</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="n" style="color: #333;">ds_lhs</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span></span>
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696
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696
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Left</span> <span class="n" style="color: #333;">msg</span> <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;">warnDs</span> <span class="kt" style="color: #458; font-weight: 600;">NoReason</span> <span class="n" style="color: #333;">msg</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span> <span class="p">;</span></span>
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697
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="p">(</span><span class="n" style="color: #333;">rule_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">_fn</span><span class="p">,</span> <span class="n" style="color: #333;">args</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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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="p">(</span><span class="n" style="color: #333;">rule_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">_fn</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rule_lhs_</span>args</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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698
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">this_mod</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getModule</span></span>
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700
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fn_unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">realIdUnfolding</span> <span class="n" style="color: #333;">poly_id</span></span>
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701
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">poly_id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">core_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arity_decrease</span></span> <span class="n" style="color: #333;">fn_unf</span></span>
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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_unf</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">specUnfolding</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left">spec_bndrs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">core_app</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rule_lhs_args</span></span> <span class="n" style="color: #333;">fn_unf</span></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"> <span class="n" style="color: #333;">spec_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">spec_name</span> <span class="n" style="color: #333;">spec_ty</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setInlinePragma</span><span class="p">`</span> <span class="n" style="color: #333;">inl_prag</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">setIdUnfolding</span><span class="p">`</span> <span class="n" style="color: #333;">spec_unf</span></span>
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"> <span class="n" style="color: #333;">arity_decrease</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isValArg</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">count</span> <span class="n" style="color: #333;">isId</span> <span class="n" style="color: #333;">spec_bndrs</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rule</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsMkUserRule</span> <span class="n" style="color: #333;">this_mod</span> <span class="n" style="color: #333;">is_local_id</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkFastString</span> <span class="p">(</span><span class="s" style="color: #d14;">"SPEC "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">showPpr</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">poly_name</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_act</span> <span class="n" style="color: #333;">poly_name</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_bndrs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="n" style="color: #333;">rule_bndrs</span> <span class="n" style="color: #333;"><span class="idiff left right">rule_lhs_</span>args</span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkVarApps</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="n" style="color: #333;">spec_id</span><span class="p">)</span> <span class="n" style="color: #333;">spec_bndrs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">spec_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLams</span> <span class="n" style="color: #333;">spec_bndrs</span> <span class="p">(</span><span class="n" style="color: #333;">core_app</span> <span class="n" style="color: #333;">poly_rhs</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.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">@@ -634,7 +634,6 @@ to connect the two, something like</td>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This wrapper is put in the TcSpecPrag, in the ABExport record of</span></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the AbsBinds.</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (Eq a, Ix b) => a -> b -> Bool</span></span>
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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# SPECIALISE f :: (Ix p, Ix q) => Int -> (p,q) -> Bool #-}</span></span>
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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = <poly_rhs></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">@@ -662,8 +661,6 @@ Note that</td>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The RHS of f_spec, <poly_rhs> has a *copy* of 'binds', so that it</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can fully specialise it.</span></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC665" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">From the TcSpecPrag, in GHC.HsToCore.Binds we generate a binding for f_spec and a RULE:</span></span>
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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f_spec :: Int -> b -> Int</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">@@ -702,14 +699,14 @@ Some wrinkles</td>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we simply do this:</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Generate a constraint to check that the specialised type (after</span></span>
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> skolemis<span class="idiff left right">e</span>ation) is equal to the instantiated function type.</span></span>
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> skolemisation) is equal to the instantiated function type.</span></span>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - But *discard* the evidence (coercion) for that constraint,</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so that we ultimately generate the simpler code</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f_spec :: Int -> F Int</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f_spec = <f rhs> Int dNumInt</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RULE: forall d. f Int d = f_spec</span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You can see this discarding happening in</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You can see this discarding happening in<span class="idiff left right"> tcSpecPrag</span></span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Note that the HsWrapper can transform *any* function with the right</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type prefix</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#05aba2c695e8e684f6f1a4a5c10de5a19175ceea"><strong>testsuite/tests/simplCore/should_compile/T18120.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ConstraintKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableSuperClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AllF</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Constraint</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">k</span><span class="p">])</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Constraint</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AllF</span> <span class="n" style="color: #333;">_c</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AllF</span> <span class="n" style="color: #333;">c</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AllF</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">xs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SListI</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Constraint</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">k</span><span class="p">])</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="n" style="color: #333;">c</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span> <span class="kr" style="font-weight: 600;">where</span></span>
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22
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="n" style="color: #333;">c</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Top</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Top</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">SListI</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="kt" style="color: #458; font-weight: 600;">Top</span></span>
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28
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">All</span> <span class="kt" style="color: #458; font-weight: 600;">SListI</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Code</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Code</span> <span class="n" style="color: #333;">a</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="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Code</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">I</span><span class="n" style="color: #333;">nt</span><span class="p">]</span> <span class="p">]</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a47b226c654d0125596f5f0c90b4958128aa558c#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</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">@@ -318,3 +318,4 @@ test('T17966',</td>
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318
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17810</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T17810</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-fspecialise-aggressively -dcore-lint -O -v0</span><span class="p">'])</span></span>
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319
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319
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<pre style="margin: 0;"> <span id="LC319" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18013</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18013</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0 -O</span><span class="p">'])</span></span>
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320
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320
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18098</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O2</span><span class="p">'])</span></span>
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321
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18120</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-dcore-lint -O</span><span class="p">'])</span></span></pre>
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