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<h3>
Vladislav Zavialov pushed to branch wip/pretty-print-mult-arr
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395">075d66c8</a></strong>
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<span>by Vladislav Zavialov</span>
<i>at 2020-09-30T09:29:59+03:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix pretty-printing of the mult-polymorphic arrow
A follow-up to !4020 (5830a12c46e7227c276a8a71213057595ee4fc04)
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<h4>6 changed files:</h4>
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<a href="#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f">
compiler/GHC/Utils/Outputable.hs
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<li class="file-stats">
<a href="#49df80cbece2436ecd7aeb99892f978156afc3a1">
testsuite/tests/linear/should_fail/LinearErrOrigin.stderr
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<li class="file-stats">
<a href="#15a204d510da2aa3578658855eaf31ce5d77274f">
testsuite/tests/linear/should_fail/LinearPartialSig.stderr
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<li class="file-stats">
<a href="#78f0ff5e11893137499ff959d44d58ad2f8e76c3">
testsuite/tests/linear/should_fail/LinearVar.stderr
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<li class="file-stats">
<a href="#11d454d9734f1432f982c1261b8ddad6ac9c1e02">
testsuite/tests/roles/should_compile/Roles13.stderr
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<li class="file-stats">
<a href="#a76d422947bfbc209eb339d5c6681d635ad09913">
testsuite/tests/simplCore/should_compile/T4201.stdout
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<h4>Changes:</h4>
<li id="d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#d3cf57b6a5ebc234dc7689db38ef9b6cf2259c0f"><strong>compiler/GHC/Utils/Outputable.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="677" 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">@@ -677,7 +677,7 @@ lbrace = docToSDoc $ Pretty.lbrace</td>
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677
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677
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"><span class="n" style="color: #333;">rbrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">docToSDoc</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Pretty</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">rbrace</span></span>
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678
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678
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"></span>
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679
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"><span class="n" style="color: #333;">mulArrow</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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680
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<pre style="margin: 0;">-<span id="LC680" class="line" lang="haskell"><span class="n" style="color: #333;">mulArrow</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left">#"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><+</span>></span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">arrow</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="n" style="color: #333;">mulArrow</span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"<span class="idiff left">%"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right"><</span>></span> <span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">arrow</span></span>
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"></span>
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682
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">forAllLit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<li id="49df80cbece2436ecd7aeb99892f978156afc3a1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#49df80cbece2436ecd7aeb99892f978156afc3a1"><strong>testsuite/tests/linear/should_fail/LinearErrOrigin.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">@@ -5,15 +5,15 @@ LinearErrOrigin.hs:7:7: error:</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> foo :: forall a b (p :: GHC.Types.Multiplicity)</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> (q :: GHC.Types.Multiplicity).</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> (a <span class="idiff left right"># p -> b) -> a # </span>q -> b</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> (a <span class="idiff left right">%p -> b) -> a %</span>q -> b</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> at LinearErrOrigin.hs:6:1-31</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> ‘q’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> foo :: forall a b (p :: GHC.Types.Multiplicity)</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> (q :: GHC.Types.Multiplicity).</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> (a <span class="idiff left right"># p -> b) -> a # </span>q -> b</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> (a <span class="idiff left right">%p -> b) -> a %</span>q -> b</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> at LinearErrOrigin.hs:6:1-31</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> • In an equation for ‘foo’: foo f x = f x</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> f :: a <span class="idiff left right"># </span>p -> b (bound at LinearErrOrigin.hs:7:5)</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> foo :: (a <span class="idiff left right"># p -> b) -> a # </span>q -> b (bound at LinearErrOrigin.hs:7:1)</span></pre>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> f :: a <span class="idiff left right">%</span>p -> b (bound at LinearErrOrigin.hs:7:5)</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> foo :: (a <span class="idiff left right">%p -> b) -> a %</span>q -> b (bound at LinearErrOrigin.hs:7:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#15a204d510da2aa3578658855eaf31ce5d77274f"><strong>testsuite/tests/linear/should_fail/LinearPartialSig.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">@@ -3,5 +3,5 @@ LinearPartialSig.hs:5:9: error:</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Found type wildcard ‘_’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> standing for ‘'Many :: GHC.Types.Multiplicity’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> To use the inferred type, enable PartialTypeSignatures</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> • In the type ‘a <span class="idiff left right"># </span>_ -> a’</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> In the type signature: f :: a <span class="idiff left right"># </span>_ -> a</span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the type ‘a <span class="idiff left right">%</span>_ -> a’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the type signature: f :: a <span class="idiff left right">%</span>_ -> a</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#78f0ff5e11893137499ff959d44d58ad2f8e76c3"><strong>testsuite/tests/linear/should_fail/LinearVar.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">LinearVar.hs:5:5: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘m’ with ‘'Many’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Expected: a <span class="idiff left right"># </span>m -> b</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: a <span class="idiff left right">%</span>m -> b</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: a -> b</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> ‘m’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> f :: forall a b (m :: GHC.Types.Multiplicity). a <span class="idiff left right"># </span>m -> b</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> f :: forall a b (m :: GHC.Types.Multiplicity). a <span class="idiff left right">%</span>m -> b</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> at LinearVar.hs:4:1-14</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> • In the expression: undefined :: a -> b</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> In an equation for ‘f’: f = undefined :: a -> b</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> f :: a <span class="idiff left right"># </span>m -> b (bound at LinearVar.hs:5:1)</span></pre>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> f :: a <span class="idiff left right">%</span>m -> b (bound at LinearVar.hs:5:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#11d454d9734f1432f982c1261b8ddad6ac9c1e02"><strong>testsuite/tests/roles/should_compile/Roles13.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">@@ -14,7 +14,7 @@ convert :: Wrap Age -> Int</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">convert</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> = convert1</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"> `cast` (<Wrap Age>_R</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> <span class="idiff left right"># </span><'Many>_N ->_R Roles13.N:Wrap[0] (Roles13.N:Age[0])</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> <span class="idiff left right">%</span><'Many>_N ->_R Roles13.N:Wrap[0] (Roles13.N:Age[0])</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"> :: (Wrap Age -> Wrap Age) ~R# (Wrap Age -> Int))</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">-- RHS size: {terms: 1, types: 0, coercions: 0, joins: 0/0}</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/075d66c8b8ad7b9a9fbb962d4ac0049961695395#a76d422947bfbc209eb339d5c6681d635ad09913"><strong>testsuite/tests/simplCore/should_compile/T4201.stdout</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"> [HasNoCafRefs, LambdaFormInfo: LFReEntrant 1, Arity: 1,</span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext"> Strictness: <S,1*U>,</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> Unfolding: InlineRule (0, True, True)</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> bof `cast` (Sym (N:Foo[0]) <span class="idiff left right"># </span><'Many>_N ->_R <T>_R)]</span></pre>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> bof `cast` (Sym (N:Foo[0]) <span class="idiff left right">%</span><'Many>_N ->_R <T>_R)]</span></pre>
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