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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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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613">7b217179</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-04-01T15:03:24-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Adjust recursion depth for inhabitation test
In #17977, we ran into the reduction depth limit of the typechecker.
That was only a symptom of a much broader issue: The recursion depth
of the coverage checker for trying to instantiate strict fields in the
`nonVoid` test was far too high (100, the `defaultMaxTcBound`).
As a result, we were performing quite poorly on `T17977`.
Short of a proper termination analysis to prove emptyness of a type,
we just arbitrarily default to a much lower recursion limit of 3.
Fixes #17977.
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<h4>5 changed files:</h4>
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<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
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<a href="#663ab451580f16183c98da78f0b907b78cc04ad6">
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testsuite/tests/pmcheck/should_compile/T17977.hs
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<a href="#ec6535bd36d396fc3581c997cf5b85dcaa7c9b7e">
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testsuite/tests/pmcheck/should_compile/T17977b.hs
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<a href="#33807fd4b8ca5e4ac745a4d2f1cf105aa1d22e7f">
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testsuite/tests/pmcheck/should_compile/T17977b.stderr
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<li class="file-stats">
<a href="#a52966ece03f9e76a93a2c4ea96b9fb25368723d">
testsuite/tests/pmcheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564"><strong>compiler/GHC/HsToCore/PmCheck/Oracle.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1319" 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="1319" 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">@@ -1319,10 +1319,11 @@ checkAllNonVoid :: RecTcChecker -> Delta -> [Type] -> DsM Bool</td>
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1319
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<pre style="margin: 0;"> <span id="LC1319" class="line" lang="haskell"><span class="n" style="color: #333;">checkAllNonVoid</span> <span class="n" style="color: #333;">rec_ts</span> <span class="n" style="color: #333;">amb_cs</span> <span class="n" style="color: #333;">strict_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<td class="diff-line-num old_line" data-linenumber="1320" 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">
1320
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">definitely_inhabited</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">definitelyInhabitedType</span> <span class="p">(</span><span class="n" style="color: #333;">delta_ty_st</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1321" 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">
1321
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"> <span class="n" style="color: #333;">tys_to_check</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filterOutM</span> <span class="n" style="color: #333;">definitely_inhabited</span> <span class="n" style="color: #333;">strict_arg_tys</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1322" 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">
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<pre style="margin: 0;">+<span id="LC1322" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fuel for the inhabitation test]</span></span>
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rec_max_bound</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tys_to_check</span> <span class="p">`</span><span class="n" style="color: #333;">lengthExceeds</span><span class="p">`</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span></span>
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<td class="diff-line-num new_line" data-linenumber="1325" 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">
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<pre style="margin: 0;"> <span id="LC1325" 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_line old" data-linenumber="1326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">defaultRecTcMaxBound</span></span></span>
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<pre style="margin: 0;">+<span id="LC1326" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;"><span class="idiff left right">3</span></span></span>
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<td class="diff-line-num new_line" data-linenumber="1327" 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">
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"> <span class="n" style="color: #333;">rec_ts'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="n" style="color: #333;">rec_max_bound</span> <span class="n" style="color: #333;">rec_ts</span></span>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"> <span class="n" style="color: #333;">allM</span> <span class="p">(</span><span class="n" style="color: #333;">nonVoid</span> <span class="n" style="color: #333;">rec_ts'</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span> <span class="n" style="color: #333;">tys_to_check</span></span>
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1342" 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="1343" 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">@@ -1342,6 +1343,7 @@ nonVoid rec_ts amb_cs strict_arg_ty = do</td>
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<pre style="margin: 0;"> <span id="LC1343" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cands</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inhabitationCandidates</span> <span class="n" style="color: #333;">amb_cs</span> <span class="n" style="color: #333;">strict_arg_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_cands</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC1345" 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;">tc</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">cands</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fuel for the inhabitation test]</span></span>
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<pre style="margin: 0;"> <span id="LC1347" 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;">rec_ts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_ts</span> <span class="n" style="color: #333;">tc</span></span>
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1346
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1348
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<pre style="margin: 0;"> <span id="LC1348" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">anyM</span> <span class="p">(</span><span class="n" style="color: #333;">cand_is_inhabitable</span> <span class="n" style="color: #333;">rec_ts'</span> <span class="n" style="color: #333;">amb_cs</span><span class="p">)</span> <span class="n" style="color: #333;">cands</span></span>
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1347
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1349
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<pre style="margin: 0;"> <span id="LC1349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A strict argument type is inhabitable by a terminating value if</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1392" 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">@@ -1390,7 +1392,7 @@ definitelyInhabitedType ty_st ty = do</td>
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1390
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1392
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">dataConImplBangs</span> <span class="n" style="color: #333;">con</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (2)</span></span>
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1391
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"></span>
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1392
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Strict argument type constraints]</span></span>
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1393
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<pre style="margin: 0;">-<span id="LC1393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1395
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~</span></span></span>
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1394
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1396
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the ConVar case of clause processing, each conlike K traditionally</span></span>
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1395
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1397
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generates two different forms of constraints:</span></span>
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1396
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1398
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"></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">@@ -1420,6 +1422,7 @@ say, `K2 undefined` or `K2 (let x = x in x)`.)</td>
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1420
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since neither the term nor type constraints mentioned above take strict</span></span>
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1421
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument types into account, we make use of the `nonVoid` function to</span></span>
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1422
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1424
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<pre style="margin: 0;"> <span id="LC1424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">determine whether a strict type is inhabitable by a terminating value or not.</span></span>
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1425
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We call this the "inhabitation test".</span></span>
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1423
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1426
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<pre style="margin: 0;"> <span id="LC1426" class="line" lang="haskell"></span>
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1424
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1427
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`nonVoid ty` returns True when either:</span></span>
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1425
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. `ty` has at least one InhabitationCandidate for which both its term and type</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">@@ -1445,15 +1448,20 @@ determine whether a strict type is inhabitable by a terminating value or not.</td>
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1445
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1448
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<pre style="margin: 0;"> <span id="LC1448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `nonVoid MyVoid` returns False. The InhabitationCandidate for the MkMyVoid</span></span>
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1446
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1449
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constructor contains Void as a strict argument type, and since `nonVoid Void`</span></span>
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1447
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1450
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> returns False, that InhabitationCandidate is discarded, leaving no others.</span></span>
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1451
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Whether or not a type is inhabited is undecidable in general.</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Fuel for the inhabitation test].</span></span>
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1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For some types, inhabitation is evident immediately and we don't need to</span></span>
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1454
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> perform expensive tests. See Note [Types that are definitely inhabitable].</span></span>
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1448
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1455
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"></span>
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1449
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Performance considerations</span></span>
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1456
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Fuel for the inhabitation test]</span></span>
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1457
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1458
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<pre style="margin: 0;">+<span id="LC1458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whether or not a type is inhabited is undecidable in general. As a result, we</span></span>
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1459
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<pre style="margin: 0;">+<span id="LC1459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can run into infinite loops in `nonVoid`. Therefore, we adopt a fuel-based</span></span>
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1460
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<pre style="margin: 0;">+<span id="LC1460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">approach to prevent that.</span></span>
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1450
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1461
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<pre style="margin: 0;"> <span id="LC1461" class="line" lang="haskell"></span>
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1451
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must be careful when recursively calling `nonVoid` on the strict argument</span></span>
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1452
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<pre style="margin: 0;">-<span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types of an InhabitationCandidate, because doing so naïvely can cause GHC to</span></span>
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1453
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<pre style="margin: 0;">-<span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fall into an infinite loop. Consider the following example:</span></span>
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1462
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<pre style="margin: 0;">+<span id="LC1462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the following example:</span></span>
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1454
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"></span>
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1455
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1464
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<pre style="margin: 0;"> <span id="LC1464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Abyss = MkAbyss !Abyss</span></span>
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1456
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<pre style="margin: 0;">-<span id="LC1456" class="line" lang="haskell"></span>
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1457
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1465
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> stareIntoTheAbyss :: Abyss -> a</span></span>
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1458
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> stareIntoTheAbyss x = case x of {}</span></span>
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1459
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1474" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1474,7 +1482,6 @@ stareIntoTheAbyss above. Then again, the same problem occurs with recursive</td>
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1474
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">newtypes, like in the following code:</span></span>
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1475
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1483
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<pre style="margin: 0;"> <span id="LC1483" class="line" lang="haskell"></span>
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1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype Chasm = MkChasm Chasm</span></span>
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1477
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"></span>
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1478
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1485
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<pre style="margin: 0;"> <span id="LC1485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> gazeIntoTheChasm :: Chasm -> a</span></span>
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1479
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1486
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> gazeIntoTheChasm x = case x of {} -- Erroneously warned as non-exhaustive</span></span>
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1480
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1487
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"></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">@@ -1498,9 +1505,26 @@ maximum recursion depth to 1 to mitigate the problem. If the branching factor</td>
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1498
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1505
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is exactly 1 (i.e., we have a linear chain instead of a tree), then it's okay</span></span>
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1499
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1506
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to stick with a larger maximum recursion depth.</span></span>
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1500
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In #17977 we saw that the defaultRecTcMaxBound (100 at the time of writing) was</span></span>
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1509
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">too large and had detrimental effect on performance of the coverage checker.</span></span>
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1510
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given that we only commit to a best effort anyway, we decided to substantially</span></span>
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1511
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decrement the recursion depth to 3, at the cost of precision in some edge cases</span></span>
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1512
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like</span></span>
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1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"></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;"> data Nat = Z | S Nat</span></span>
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Down :: Nat -> Type where</span></span>
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Down :: !(Down n) -> Down (S n)</span></span>
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: Down (S (S (S (S (S Z))))) -> ()</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;"> f x = case x of {}</span></span>
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1519
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<pre style="margin: 0;">+<span id="LC1519" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since the coverage won't bother to instantiate Down 4 levels deep to see that it</span></span>
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is in fact uninhabited, it will emit a inexhaustivity warning for the case.</span></span>
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1522
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Types that are definitely inhabitable]</span></span>
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1501
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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;">Another microoptimization applies to data types like this one:</span></span>
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1502
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1526
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"></span>
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1503
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<pre style="margin: 0;">-<span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a = ![a] !T</span></span>
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1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a = <span class="idiff left right">S </span>![a] !T</span></span>
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1504
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>
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1529
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Even though there is a strict field of type [a], it's quite silly to call</span></span>
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1506
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1530
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nonVoid on it, since it's "obvious" that it is inhabitable. To make this</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613#663ab451580f16183c98da78f0b907b78cc04ad6"><strong>testsuite/tests/pmcheck/should_compile/T17977.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 DataKinds #-}</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 GADTs #-}</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 ScopedTypeVariables #-}</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 TypeFamilies #-}</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 TypeOperators #-}</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 UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC7" 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="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" 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="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Type.Equality</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SZ</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="kt" style="color: #458; font-weight: 600;">Z</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;">SS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">S'</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">S'</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkR</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">o</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">o</span><span class="p">)</span></span>
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23
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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;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">S'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">o</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SNat</span> <span class="n" style="color: #333;">o</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">o</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NatPlus</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">:~:</span> <span class="n" style="color: #333;">o</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SS</span> <span class="n" style="color: #333;">sm</span><span class="p">)</span> <span class="n" style="color: #333;">sn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SS</span> <span class="n" style="color: #333;">so</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkR</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">sm</span> <span class="n" style="color: #333;">sn</span> <span class="n" style="color: #333;">so</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Refl</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613#ec6535bd36d396fc3581c997cf5b85dcaa7c9b7e"><strong>testsuite/tests/pmcheck/should_compile/T17977b.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 DataKinds #-}</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 GADTs #-}</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 KindSignatures #-}</span></span>
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4
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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 EmptyCase #-}</span></span>
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<pre style="margin: 0;">+<span id="LC5" 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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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" 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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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">n</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="n" style="color: #333;">n</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>
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19
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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="n" style="color: #333;">f'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span><span class="p">))))</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="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">f'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Down</span> <span class="n" style="color: #333;">r</span><span class="p">)</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="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="n" style="color: #333;">n</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="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Up</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613#33807fd4b8ca5e4ac745a4d2f1cf105aa1d22e7f"><strong>testsuite/tests/pmcheck/should_compile/T17977b.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T17977b.hs:21:1: warning: [-Woverlapping-patterns (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Pattern match has inaccessible right hand side</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> In an equation for ‘f'’: f' (Down r) = ...</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613#a52966ece03f9e76a93a2c4ea96b9fb25368723d"><strong>testsuite/tests/pmcheck/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">@@ -114,6 +114,10 @@ test('T17703', normal, compile,</td>
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114
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17783</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>
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116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17977b</span><span class="p">',</span> <span class="nv" style="color: #008080;">collect_compiler_stats</span><span class="p">('</span><span class="s1" style="color: #d14;">bytes allocated</span><span class="p">',</span><span class="mi" style="color: #099;">10</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-fwarn-incomplete-patterns -fwarn-overlapping-patterns</span><span class="p">'])</span></span>
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117
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Other tests</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">pmc001</span><span class="p">',</span> <span class="o" style="font-weight: 600;">[]</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span></span>
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