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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:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8">c2cfdfde</a></strong>
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<span>by Aaron Allen</span>
<i>at 2020-07-13T09:00:33-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Warn about empty Char enumerations (#18402)
Currently the "Enumeration is empty" warning (-Wempty-enumerations)
only fires for numeric literals. This patch adds support for `Char`
literals so that enumerating an empty list of `Char`s will also
trigger the warning.
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#f017e4c978a9ff341ce5a7b838787fd2a4758b59">
compiler/GHC/HsToCore/Match/Literal.hs
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<a href="#8820a7ba357d6f592fdbaeb3148839d0025418a9">
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+
testsuite/tests/warnings/should_compile/T18402.hs
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<a href="#2086bae800f93f4c07911651ae710be269d7ed41">
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+
testsuite/tests/warnings/should_compile/T18402.stderr
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<li class="file-stats">
<a href="#41a913dca0020ecd1ca28a364e1f9aa46db04c5a">
testsuite/tests/warnings/should_compile/all.T
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<h4>Changes:</h4>
<li id="f017e4c978a9ff341ce5a7b838787fd2a4758b59">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8#f017e4c978a9ff341ce5a7b838787fd2a4758b59"><strong>compiler/GHC/HsToCore/Match/Literal.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="261" 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">@@ -261,18 +261,19 @@ but perhaps that does not matter too much.</td>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"><span class="n" style="color: #333;">warnAboutEmptyEnumerations</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;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span></span>
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<td class="diff-line-num old_line" data-linenumber="262" 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">
262
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<td class="diff-line-num new_line" data-linenumber="262" 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">
262
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<pre style="margin: 0;"> <span id="LC262" 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;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="263" 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">
263
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<td class="diff-line-num new_line" data-linenumber="263" 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">
263
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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264
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<td class="diff-line-num new_line old" data-linenumber="264" 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="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Warns about @[2,3 .. 1]@ <span class="idiff left right">which returns</span> the empty list.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="265" 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">
265
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">O</span>nly works for integral types, not floating point.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="266" 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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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Warns about @[2,3 .. 1]@ <span class="idiff left right">or @['b' .. 'a']@ which return</span> the empty list.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="266" 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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<td class="diff-line-num new new_line" data-linenumber="265" 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="LC265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">For numeric literals, o</span>nly works for integral types, not floating point.</span></span>
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"><span class="n" style="color: #333;">warnAboutEmptyEnumerations</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fromExpr</span> <span class="n" style="color: #333;">mThnExpr</span> <span class="n" style="color: #333;">toExpr</span></span>
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<td class="diff-line-num old old_line" data-linenumber="267" 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">
267
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">wopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnEmptyEnumerations</span> <span class="n" style="color: #333;">dflags</span></span>
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<td class="diff-line-num old old_line" data-linenumber="268" 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">
268
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<pre style="margin: 0;">-<span id="LC268" 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;">from_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">from</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;">getLHsIntegralLit</span> <span class="n" style="color: #333;">fromExpr</span></span>
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<td class="diff-line-num new old_line" data-linenumber="269" 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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<td class="diff-line-num new new_line" data-linenumber="267" 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="LC267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">wopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnEmptyEnumerations</span> <span class="n" style="color: #333;">dflags</span></span>
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<td class="diff-line-num new new_line" data-linenumber="268" 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="LC268" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num new old_line" data-linenumber="269" 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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<td class="diff-line-num new new_line" data-linenumber="269" 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="LC269" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Numeric Literals</span></span>
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<td class="diff-line-num new new_line" data-linenumber="270" 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="LC270" 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;">from_ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">from</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;">getLHsIntegralLit</span> <span class="n" style="color: #333;">fromExpr</span></span>
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<pre style="margin: 0;"> <span id="LC271" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getNormalisedTyconName</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">from_ty</span></span>
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270
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<td class="diff-line-num new_line" data-linenumber="272" 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="LC272" 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;">mThn</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">getLHsIntegralLit</span> <span class="n" style="color: #333;">mThnExpr</span></span>
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<pre style="margin: 0;"> <span id="LC273" 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;">to</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;">getLHsIntegralLit</span> <span class="n" style="color: #333;">toExpr</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">check</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Enum</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DsM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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273
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="n" style="color: #333;">_proxy</span></span>
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274
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<pre style="margin: 0;">-<span id="LC274" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">enumeration</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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275
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">warnDs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnEmptyEnumerations</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Enumeration is empty"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">enumeration</span><span class="p">)</span> <span class="n" style="color: #333;">raiseWarning</span></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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277
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"> <span class="n" style="color: #333;">enumeration</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">enumeration</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mThn</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="296" 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">@@ -296,7 +297,18 @@ warnAboutEmptyEnumerations fam_envs dflags fromExpr mThnExpr toExpr</td>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See the T10930b test case for an example of where this matters.</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Char literals (#18402)</span></span>
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<pre style="margin: 0;">+<span id="LC301" 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;">fromChar</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">fromExpr</span></span>
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<pre style="margin: 0;">+<span id="LC302" 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;">mThnChar</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">mThnExpr</span></span>
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<pre style="margin: 0;">+<span id="LC303" 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;">toChar</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">toExpr</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">enumeration</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mThnChar</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">fromChar</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">toChar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">thnChar</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">fromChar</span><span class="p">,</span> <span class="n" style="color: #333;">thnChar</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">toChar</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">enumeration</span><span class="p">)</span> <span class="n" style="color: #333;">raiseWarning</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>
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309
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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310
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"> <span class="n" style="color: #333;">raiseWarning</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">warnDs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnEmptyEnumerations</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Enumeration is empty"</span><span class="p">)</span></span>
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300
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312
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"></span>
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301
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsIntegralLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <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;">Integer</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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302
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ See if the expression is an 'Integral' literal.</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">@@ -325,6 +337,14 @@ getSimpleIntegralLit (HsWord64Prim _ i) = Just (i, word64PrimTy)</td>
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325
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="haskell"><span class="n" style="color: #333;">getSimpleIntegralLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsInteger</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">i</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <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;">i</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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338
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="haskell"><span class="n" style="color: #333;">getSimpleIntegralLit</span> <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;">Nothing</span></span>
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339
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<pre style="margin: 0;"> <span id="LC339" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cd">-- | Extract the Char if the expression is a Char literal.</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsExpr</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Char</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsPar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTick</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsBinTick</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLHsCharLit</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsChar</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">c</span><span class="p">)))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">c</span></span>
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="n" style="color: #333;">getLHsCharLit</span> <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;">Nothing</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"><span class="cd">-- | Convert a pair (Integer, Type) to (Integer, Name) after eventually</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- normalising the type</span></span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="haskell"><span class="n" style="color: #333;">getNormalisedTyconName</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Integer</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="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Integer</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8#8820a7ba357d6f592fdbaeb3148839d0025418a9"><strong>testsuite/tests/warnings/should_compile/T18402.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18402</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="sc" style="color: #d14;">'b'</span> <span class="o" style="font-weight: 600;">..</span> <span class="sc" style="color: #d14;">'a'</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- empty</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="sc" style="color: #d14;">'b'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'a'</span> <span class="o" style="font-weight: 600;">..</span> <span class="sc" style="color: #d14;">'c'</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- empty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="5" 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">
5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="sc" style="color: #d14;">'b'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'c'</span> <span class="o" style="font-weight: 600;">..</span> <span class="sc" style="color: #d14;">'a'</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- empty</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="sc" style="color: #d14;">'a'</span> <span class="o" style="font-weight: 600;">..</span> <span class="sc" style="color: #d14;">'c'</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- not empty</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="sc" style="color: #d14;">'a'</span><span class="p">,</span> <span class="sc" style="color: #d14;">'c'</span> <span class="o" style="font-weight: 600;">..</span> <span class="sc" style="color: #d14;">'b'</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- not empty</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8#2086bae800f93f4c07911651ae710be269d7ed41"><strong>testsuite/tests/warnings/should_compile/T18402.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18402.hs:3:5: warning: [-Wempty-enumerations (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Enumeration is empty</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">T18402.hs:4:5: warning: [-Wempty-enumerations (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> Enumeration is empty</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">T18402.hs:5:5: warning: [-Wempty-enumerations (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> Enumeration is empty</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2cfdfde20d0d6c0e16aa7a84d8ebe51501bcfa8#41a913dca0020ecd1ca28a364e1f9aa46db04c5a"><strong>testsuite/tests/warnings/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">@@ -30,3 +30,5 @@ test('Overflow', expect_broken_for(16543, ['hpc']), compile, [''])</td>
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30
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnusedPackages</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">UnusedPackages.hs</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-package=bytestring -package=base -package=process -package=ghc -Wunused-packages</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18402</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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