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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a74ec37c9d7679a5563ab86a8759c79c3c5de6f0">a74ec37c</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-06-27T11:56:34-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better loop detection in findTypeShape
Andreas pointed out, in !3466, that my fix for #18304 was not
quite right. This patch fixes it properly, by having just one
RecTcChecker rather than (implicitly) two nested ones, in
findTypeShape.
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">
compiler/GHC/Core/FamInstEnv.hs
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<li class="file-stats">
<a href="#f4421b4e35592648510c877ecf55b1af2b96dcee">
compiler/GHC/Core/Opt/WorkWrap/Utils.hs
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<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<h4>Changes:</h4>
<li id="91648438362e5a35363d2bb7abb04016dedd7d7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a74ec37c9d7679a5563ab86a8759c79c3c5de6f0#91648438362e5a35363d2bb7abb04016dedd7d7e"><strong>compiler/GHC/Core/FamInstEnv.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="32" 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">@@ -32,8 +32,8 @@ module GHC.Core.FamInstEnv (</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Normalisation</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">topNormaliseType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">topNormaliseType_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">normaliseType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">normaliseTcApp</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">normaliseTcArgs</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">reduceTyFamApp_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">normaliseType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">normaliseTcApp</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">topReduceTyFamApp_maybe</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">reduceTyFamApp_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Flattening</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">flattenTys</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1100" 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="1100" 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">@@ -1100,7 +1100,7 @@ reduceTyFamApp_maybe :: FamInstEnvs</td>
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the role we seek is representational</span></span>
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It does *not* normalise the type arguments first, so this may not</span></span>
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1102
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<pre style="margin: 0;"> <span id="LC1102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- go as far as you want. If you want normalised type arguments,</span></span>
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1103
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<pre style="margin: 0;">-<span id="LC1103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- use <span class="idiff left right">normaliseTcArgs first.</span></span></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- use <span class="idiff left right">topReduceTyFamApp_maybe</span></span></span>
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1104
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The TyCon can be oversaturated.</span></span>
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1106
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<pre style="margin: 0;"> <span id="LC1106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Works on both open and closed families</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1308" 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="1308" 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">@@ -1308,10 +1308,9 @@ topNormaliseType_maybe env ty</td>
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1308
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to the normalised type's kind</span></span>
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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="haskell"> <span class="n" style="color: #333;">tyFamStepper</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NormaliseStepper</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCoercionN</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="haskell"> <span class="n" style="color: #333;">tyFamStepper</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="c1" style="color: #998; font-style: italic;">-- Try to step a type/data family</span></span>
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1311
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<pre style="margin: 0;">-<span id="LC1311" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">args_co</span><span class="p">,</span> <span class="n" style="color: #333;">ntys</span><span class="p">,</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">normaliseTcArgs</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC1312" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">reduceTyFamApp_maybe</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">ntys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1313" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Step</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">args_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span></span>
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1314
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<pre style="margin: 0;">-<span id="LC1314" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Done</span></span>
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<pre style="margin: 0;">+<span id="LC1311" 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;">topReduceTyFamApp_maybe</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1312" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Step</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1313" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Done</span></span>
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<pre style="margin: 0;"> <span id="LC1314" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1315" 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="LC1316" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1366,18 +1365,23 @@ normalise_tc_app tc tys</td>
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"> <span class="n" style="color: #333;">final_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoherenceRightCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">nty</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span> <span class="n" style="color: #333;">orig_to_nty</span></span>
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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;">---------------</span></span>
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<pre style="margin: 0;">-<span id="LC1369" class="line" lang="haskell"><span class="cd">-- | Normalise arguments to a tycon</span></span>
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<pre style="margin: 0;">-<span id="LC1370" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseTcArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ env't with family instances</span></span>
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<pre style="margin: 0;">-<span id="LC1371" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ desired role of output coercion</span></span>
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<pre style="margin: 0;">-<span id="LC1372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ tc</span></span>
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<pre style="margin: 0;">-<span id="LC1373" 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;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ tys</span></span>
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1374
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<pre style="margin: 0;">-<span id="LC1374" 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;">Coercion</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span><span class="p">)</span></span>
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1375
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<pre style="margin: 0;">-<span id="LC1375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ co :: tc tys ~ tc new_tys</span></span>
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1376
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<pre style="margin: 0;">-<span id="LC1376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: co might not be homogeneous</span></span>
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1377
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<pre style="margin: 0;">-<span id="LC1377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- last coercion :: kind(tc tys) ~ kind(tc new_tys)</span></span>
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1378
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<pre style="margin: 0;">-<span id="LC1378" class="line" lang="haskell"><span class="n" style="color: #333;">normaliseTcArgs</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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1379
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<pre style="margin: 0;">-<span id="LC1379" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initNormM</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">role</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1380
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<pre style="margin: 0;">-<span id="LC1380" class="line" lang="haskell"> <span class="n" style="color: #333;">normalise_tc_args</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1368" class="line" lang="haskell"><span class="cd">-- | Try to simplify a type-family application, by *one* step</span></span>
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<pre style="margin: 0;">+<span id="LC1369" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If topReduceTyFamApp_maybe env r F tys = Just (co, rhs, res_co)</span></span>
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<pre style="margin: 0;">+<span id="LC1370" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then co :: F tys ~R# rhs</span></span>
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<pre style="margin: 0;">+<span id="LC1371" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- res_co :: typeKind(F tys) ~ typeKind(rhs)</span></span>
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Type families and data families; always Representational role</span></span>
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<pre style="margin: 0;">+<span id="LC1373" class="line" lang="haskell"><span class="n" style="color: #333;">topReduceTyFamApp_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1374" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1375" class="line" lang="haskell"><span class="n" style="color: #333;">topReduceTyFamApp_maybe</span> <span class="n" style="color: #333;">envs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">arg_tys</span></span>
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1376
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<pre style="margin: 0;">+<span id="LC1376" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isFamilyTyCon</span> <span class="n" style="color: #333;">fam_tc</span> <span class="c1" style="color: #998; font-style: italic;">-- type families and data families</span></span>
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1377
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<pre style="margin: 0;">+<span id="LC1377" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reduceTyFamApp_maybe</span> <span class="n" style="color: #333;">envs</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">ntys</span></span>
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1378
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<pre style="margin: 0;">+<span id="LC1378" 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;">args_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span></span>
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1379
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<pre style="margin: 0;">+<span id="LC1379" 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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1380
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span></span>
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1383
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<pre style="margin: 0;">+<span id="LC1383" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">args_co</span><span class="p">,</span> <span class="n" style="color: #333;">ntys</span><span class="p">,</span> <span class="n" style="color: #333;">res_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">initNormM</span> <span class="n" style="color: #333;">envs</span> <span class="n" style="color: #333;">role</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"> <span class="n" style="color: #333;">normalise_tc_args</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">arg_tys</span></span>
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1381
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1385
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"></span>
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1382
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1386
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<pre style="margin: 0;"> <span id="LC1386" class="line" lang="haskell"><span class="n" style="color: #333;">normalise_tc_args</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- tc tys</span></span>
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1383
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1387
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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;">NormM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span><span class="p">)</span></span>
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<li id="f4421b4e35592648510c877ecf55b1af2b96dcee">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a74ec37c9d7679a5563ab86a8759c79c3c5de6f0#f4421b4e35592648510c877ecf55b1af2b96dcee"><strong>compiler/GHC/Core/Opt/WorkWrap/Utils.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1025,7 +1025,19 @@ findTypeShape fam_envs ty</td>
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1025
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1026
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"></span>
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1027
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1027
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<pre style="margin: 0;"> <span id="LC1027" 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;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataProductTyCon_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_tc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitForAllTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1031" 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">
1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">ty'</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" 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 new new_line" data-linenumber="1034" 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">
1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsUnk</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topReduceTyFamApp_maybe</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1038" 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">
1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">rhs</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" 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="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataProductTyCon_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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1029
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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1030
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc</span></span>
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1031
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">tc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1033" 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="1045" 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">@@ -1033,10 +1045,8 @@ findTypeShape fam_envs ty</td>
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1033
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maybe we should do so in checkRecTc.</span></span>
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1034
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">scaledThing</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dataConInstArgTys</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tc_args</span><span class="p">))</span></span>
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1035
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;">-<span id="LC1036" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitForAllTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">ty'</span></span>
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1038
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topNormaliseType_maybe</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" 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;">ty'</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">instNewTyCon_maybe</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tc_args</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1049" 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">
1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">tc</span></span>
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1040
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">ty'</span></span>
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1041
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"></span>
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1042
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1052
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<pre style="margin: 0;"> <span id="LC1052" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -372,16 +372,9 @@ pmTopNormaliseType (TySt inert) typ</td>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"> <span class="n" style="color: #333;">tyFamStepper</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NormaliseStepper</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell"> <span class="n" style="color: #333;">tyFamStepper</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="c1" style="color: #998; font-style: italic;">-- Try to step a type/data family</span></span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">_args_co</span><span class="p">,</span> <span class="n" style="color: #333;">ntys</span><span class="p">,</span> <span class="n" style="color: #333;">_res_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">normaliseTcArgs</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: It's OK to use normaliseTcArgs here instead of</span></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- normalise_tc_args (which takes the LiftingContext described</span></span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in Note [Normalising types]) because the reduceTyFamApp below</span></span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- works only at top level. We'll never recur in this function</span></span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- after reducing the kind of a bound tyvar.</span></span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">reduceTyFamApp_maybe</span> <span class="n" style="color: #333;">env</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">ntys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">_co</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Step</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">rhs</span> <span class="p">((</span><span class="n" style="color: #333;">rhs</span><span class="o" style="font-weight: 600;">:</span><span class="p">),</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Done</span></span>
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<pre style="margin: 0;">+<span id="LC375" 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;">topReduceTyFamApp_maybe</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Step</span> <span class="n" style="color: #333;">rec_nts</span> <span class="n" style="color: #333;">rhs</span> <span class="p">((</span><span class="n" style="color: #333;">rhs</span><span class="o" style="font-weight: 600;">:</span><span class="p">),</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NS_Done</span></span>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"><span class="cd">-- | Returns 'True' if the argument 'Type' is a fully saturated application of</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a closed type constructor.</span></span>
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