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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/404581eaa3bf8d3f100da7610a6a38158bea17c4">404581ea</a></strong>
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<span>by Jeff Happily</span>
<i>at 2020-05-13T20:08:15-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle single unused import
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#e05ee69330b0f7088f11a5f3567137547489664d">
compiler/GHC/Rename/Names.hs
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<li class="file-stats">
<a href="#6a72313f5f321acaf8106c4f002b1c6e5b91f4a8">
testsuite/tests/rename/should_compile/T13064.stderr
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</li>
<li class="file-stats">
<a href="#c256c27895a80b6acfea2ba0df96b1dcf386bc7d">
testsuite/tests/rename/should_compile/rn046.stderr
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<li class="file-stats">
<a href="#20b0746060ab5dd2314f36a0ed5c3a7ddef01151">
testsuite/tests/rename/should_fail/T7454.stderr
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<li class="file-stats">
<a href="#fed16dbf9bad4d21a0400c84a983e910a05bd566">
testsuite/tests/rename/should_fail/T8149.stderr
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<h4>Changes:</h4>
<li id="e05ee69330b0f7088f11a5f3567137547489664d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4#e05ee69330b0f7088f11a5f3567137547489664d"><strong>compiler/GHC/Rename/Names.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1498,9 +1498,16 @@ warnUnusedImport flag fld_env (L loc decl, used, unused)</td>
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">unused</span></span>
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1499
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1499
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<pre style="margin: 0;"> <span id="LC1499" 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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1500
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1500
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<pre style="margin: 0;"> <span id="LC1500" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only one import is unused, with `SrcSpan` covering only the unused item instead of</span></span>
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1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the whole import statement</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1503" 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="LC1503" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">imports</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ideclHiding</span> <span class="n" style="color: #333;">decl</span></span>
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">unused</span> <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 new_line" data-linenumber="1505" 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="LC1505" 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="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</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;">find</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</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="n" style="color: #333;">ie</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">((</span><span class="n" style="color: #333;">ieName</span> <span class="n" style="color: #333;">ie</span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">elem</span><span class="p">`</span> <span class="n" style="color: #333;">unused</span><span class="p">)</span> <span class="n" style="color: #333;">imports</span></span>
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addWarnAt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="n" style="color: #333;">flag</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">msg2</span></span>
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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="c1" style="color: #998; font-style: italic;">-- Some imports are unused</span></span>
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC1503" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addWarnAt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="n" style="color: #333;">flag</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span> <span class="idiff left right"> </span><span class="n" style="color: #333;">msg2</span></span>
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addWarnAt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="n" style="color: #333;">flag</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">msg2</span></span>
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1504
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1511
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"></span>
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1505
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1506
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"> <span class="n" style="color: #333;">msg1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">pp_herald</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="n" style="color: #333;">pp_mod</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">is_redundant</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4#6a72313f5f321acaf8106c4f002b1c6e5b91f4a8"><strong>testsuite/tests/rename/should_compile/T13064.stderr</strong></a>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T13064.hs:5:1: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T13064.hs:5:<span class="idiff left right">2</span>1: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> The import of ‘pure’ from module ‘Prelude’ is redundant</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4#c256c27895a80b6acfea2ba0df96b1dcf386bc7d"><strong>testsuite/tests/rename/should_compile/rn046.stderr</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">@@ -4,5 +4,5 @@ rn046.hs:2:1: warning: [-Wunused-imports (in -Wextra)]</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> except perhaps to import instances from ‘Data.List’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> To import instances alone, use: import Data.List()</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">rn046.hs:3:1: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">rn046.hs:3:1<span class="idiff left right">9</span>: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> The import of ‘ord’ from module ‘Data.Char’ is redundant</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4#20b0746060ab5dd2314f36a0ed5c3a7ddef01151"><strong>testsuite/tests/rename/should_fail/T7454.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T7454.hs:5:<span class="idiff left right">1</span>: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T7454.hs:5:<span class="idiff left right">23</span>: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> The import of ‘Arrow’ from module ‘Control.Arrow’ is redundant</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/404581eaa3bf8d3f100da7610a6a38158bea17c4#fed16dbf9bad4d21a0400c84a983e910a05bd566"><strong>testsuite/tests/rename/should_fail/T8149.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T8149.hs:5:<span class="idiff left right">1</span>: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T8149.hs:5:<span class="idiff left right">36</span>: warning: [-Wunused-imports (in -Wextra)]</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> The import of ‘WriterT’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> from module ‘Control.Monad.Trans.Writer’ is redundant</span></pre>
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