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<h3>
Ben Gamari pushed to branch ghc-8.8
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/20f8f2f98bd686b297e7290b2348ac7e937c1a5a">20f8f2f9</a></strong>
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<span>by Ryan Scott</span>
<i>at 2019-04-09T20:21:35Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use funPrec, not topPrec, to parenthesize GADT argument types
A simple oversight. Fixes #16527.
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<h4>5 changed files:</h4>
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<a href="#09d8bceab47b805883c4f6a95dcc944b6aa989af">
compiler/iface/IfaceSyn.hs
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testsuite/tests/ghci/scripts/T16527.hs
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testsuite/tests/ghci/scripts/T16527.script
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testsuite/tests/ghci/scripts/T16527.stdout
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<li class="file-stats">
<a href="#080fb38cc741d3f1a476696b3373ab7cf48c2aaa">
testsuite/tests/ghci/scripts/all.T
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<h4>Changes:</h4>
<li id="09d8bceab47b805883c4f6a95dcc944b6aa989af">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/20f8f2f98bd686b297e7290b2348ac7e937c1a5a#09d8bceab47b805883c4f6a95dcc944b6aa989af"><strong>compiler/iface/IfaceSyn.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1034" 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">@@ -1034,7 +1034,7 @@ pprIfaceConDecl ss gadt_style tycon tc_binders parent</td>
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1034
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a compound field type is if it's preceded by a bang pattern.</span></span>
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="n" style="color: #333;">pprFieldArgTy</span> <span class="p">(</span><span class="n" style="color: #333;">bang</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr_arg_ty</span> <span class="p">(</span><span class="n" style="color: #333;">bang_prec</span> <span class="n" style="color: #333;">bang</span><span class="p">)</span> <span class="n" style="color: #333;">bang</span> <span class="n" style="color: #333;">ty</span></span>
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1036
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If not using record syntax, a compound field type might need to be</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesize if one of the following holds:</span></span>
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesize<span class="idiff left right">d</span> if one of the following holds:</span></span>
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1038
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 1. We're using Haskell98 syntax.</span></span>
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- 2. The field type is preceded with a bang pattern.</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1046" 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="1046" 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">@@ -1046,18 +1046,23 @@ pprIfaceConDecl ss gadt_style tycon tc_binders parent</td>
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1046
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1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we're displaying the fields GADT-style, e.g.,</span></span>
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data Foo a where</span></span>
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1049
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<pre style="margin: 0;">-<span id="LC1049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkFoo :: Maybe a -> Foo</span></span>
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- MkFoo :: <span class="idiff left right">(Int -> Int) -> </span>Maybe a -> Foo</span></span>
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1050
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<pre style="margin: 0;"> <span id="LC1050" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1051
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<pre style="margin: 0;">-<span id="LC1051" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then there is no inherent need to parenthesize compound fields like</span></span>
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<pre style="margin: 0;">-<span id="LC1052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `Maybe a` (bang patterns notwithstanding). If we're displaying the</span></span>
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<pre style="margin: 0;">-<span id="LC1053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fields Haskell98-style, e.g.,</span></span>
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we use `funPrec`, since that will ensure `Int -> Int` gets the</span></span>
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parentheses that it requires, but simple compound types like `Maybe a`</span></span>
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which don't require parentheses in a function argument position) won't</span></span>
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- get them, assuming that there are no bang patterns (see bang_prec).</span></span>
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1054
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1055
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<pre style="margin: 0;">-<span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right"> data Foo a = MkFoo (Maybe a)</span></span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">If we're displaying the fields Haskell98-style, e.g.,</span></span></span>
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1056
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1057
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<pre style="margin: 0;"> <span id="LC1057" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1057
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<pre style="margin: 0;">-<span id="LC1057" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we *must* parenthesize compound fields like (Maybe a).</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- data Foo a = MkFoo (Int -> Int) (Maybe a)</span></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then not only must we parenthesize `Int -> Int`, we must also</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesize compound fields like (Maybe a). Therefore, we pick</span></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `appPrec`, which has higher precedence than `funPrec`.</span></span>
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1058
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"> <span class="n" style="color: #333;">gadt_prec</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PprPrec</span></span>
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1059
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="n" style="color: #333;">gadt_prec</span></span>
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1060
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<pre style="margin: 0;">-<span id="LC1060" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">gadt_style</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">top</span>Prec</span></span>
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">gadt_style</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">fun</span>Prec</span></span>
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1066
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<pre style="margin: 0;"> <span id="LC1066" 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;">appPrec</span></span>
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1067
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The presence of bang patterns or UNPACK annotations requires</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/20f8f2f98bd686b297e7290b2348ac7e937c1a5a#79651925de0222571335b84d2e4099fdadbfdcf8"><strong>testsuite/tests/ghci/scripts/T16527.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 GADTs #-}</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 RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T16527</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT1</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkT2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">Maybe</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;">T</span></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">:load T16527</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">:info T</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/20f8f2f98bd686b297e7290b2348ac7e937c1a5a#a4a430318f4cbf85277397c1d602c7f29591d2d6"><strong>testsuite/tests/ghci/scripts/T16527.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">data T where</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"> MkT1 :: (Int -> Int) -> T</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> MkT2 :: (forall a. Maybe a) -> T</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> -- Defined at T16527.hs:5:1</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/20f8f2f98bd686b297e7290b2348ac7e937c1a5a#080fb38cc741d3f1a476696b3373ab7cf48c2aaa"><strong>testsuite/tests/ghci/scripts/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="295" 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">@@ -295,3 +295,4 @@ test('T15941', normal, ghci_script, ['T15941.script'])</td>
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<pre style="margin: 0;"> <span id="LC295" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16030'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16030.script'</span><span class="p">])</span></span>
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T11606'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T11606.script'</span><span class="p">])</span></span>
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16089'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16089.script'</span><span class="p">])</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16527'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16527.script'</span><span class="p">])</span></span></pre>
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