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<h3>
Vladislav Zavialov pushed to branch wip/lexical-negation
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5">fa01c77b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-06-29T22:56:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -XLexicalNegation (GHC Proposal #229)
This patch introduces a new extension, -XLexicalNegation, which detects
whether the minus sign stands for negation or subtraction using the
whitespace-based rules described in GHC Proposal #229.
</pre>
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<h4>16 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
</li>
<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<li class="file-stats">
<a href="#a1ae0a1be35c859d90b0756920a7198075fb91e1">
compiler/GHC/Parser/Lexer.x
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<li class="file-stats">
<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<li class="file-stats">
<a href="#f86c1b4986fc1a29572fa45c0cb2eb181d605273">
<span class="new-file">
+
docs/users_guide/exts/lexical_negation.rst
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<li class="file-stats">
<a href="#afc5c9567f619749d27f89c5904b2eb41814069c">
docs/users_guide/exts/negative_literals.rst
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<li class="file-stats">
<a href="#cc7795244e6c5ca7ce8a56a7f1f92e9427dcabfb">
docs/users_guide/exts/syntax.rst
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<li class="file-stats">
<a href="#3f7d85c388596f9ef50f1a3e0334bdb67007e969">
libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs
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<li class="file-stats">
<a href="#9f7a74d3512ab004425ec39cbbcb9737e2ecaa82">
testsuite/tests/driver/T4437.hs
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<li class="file-stats">
<a href="#b800f96dc5df3e1c1ad35199012912cd86e63cd9">
<span class="new-file">
+
testsuite/tests/parser/should_compile/LexNegVsNegLit.hs
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<li class="file-stats">
<a href="#cc2173e7bdf27bf351c1842c6d7292484e7f82ac">
<span class="new-file">
+
testsuite/tests/parser/should_compile/LexicalNegation.hs
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<li class="file-stats">
<a href="#a43397658ba43ce6747320867b3a0330bcea2ea5">
testsuite/tests/parser/should_compile/all.T
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<li class="file-stats">
<a href="#07c2a0ef312669ecb8100fc225982ec371285ed2">
<span class="new-file">
+
testsuite/tests/parser/should_run/LexNegLit.hs
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<li class="file-stats">
<a href="#8c9906c71d4e6eb34d6af0300e5a71e541867c67">
<span class="new-file">
+
testsuite/tests/parser/should_run/LexNegLit.stdout
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<li class="file-stats">
<a href="#23b02b5c77944d9957120841eb78b343a4e50e68">
testsuite/tests/parser/should_run/all.T
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<li class="file-stats">
<a href="#46ddb8dda2edd2df4717a3285e83997fc812a347">
utils/haddock
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<h4>Changes:</h4>
<li id="774d88050336ef660c7a219fb06c480c2fc639bc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3784" 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">@@ -3784,6 +3784,7 @@ xFlagsDeps = [</td>
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3784
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3784
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<pre style="margin: 0;"> <span id="LC3784" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"JavaScriptFFI"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">JavaScriptFFI</span><span class="p">,</span></span>
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3785
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3785
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<pre style="margin: 0;"> <span id="LC3785" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"KindSignatures"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">KindSignatures</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="3786" 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">
3786
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<td class="diff-line-num new_line" data-linenumber="3786" 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">
3786
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<pre style="margin: 0;"> <span id="LC3786" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"LambdaCase"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LambdaCase</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="3787" 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="3787" 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">
3787
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<pre style="margin: 0;">+<span id="LC3787" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"LexicalNegation"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LexicalNegation</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="3787" 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">
3787
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<td class="diff-line-num new_line" data-linenumber="3788" 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">
3788
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<pre style="margin: 0;"> <span id="LC3788" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"LiberalTypeSynonyms"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LiberalTypeSynonyms</span><span class="p">,</span></span>
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3789
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<pre style="margin: 0;"> <span id="LC3789" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"LinearTypes"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LinearTypes</span><span class="p">,</span></span>
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3789
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3790
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<pre style="margin: 0;"> <span id="LC3790" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"MagicHash"</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">MagicHash</span><span class="p">,</span></span>
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<li id="bf951467d4a9aa443cb109cb4c84a2891945649b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#bf951467d4a9aa443cb109cb4c84a2891945649b"><strong>compiler/GHC/Parser.y</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">@@ -93,7 +93,7 @@ import GHC.Builtin.Types ( unitTyCon, unitDataCon, tupleTyCon, tupleDataCon, nil</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">manyDataConTyCon</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">expect</span> <span class="mi" style="color: #099;">23<span class="idiff left right">2</span></span> <span class="c1" style="color: #998; font-style: italic;">-- shift/reduce conflicts</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">expect</span> <span class="mi" style="color: #099;">23<span class="idiff left right">4</span></span> <span class="c1" style="color: #998; font-style: italic;">-- shift/reduce conflicts</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Last updated: 08 June 2020</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -553,6 +553,7 @@ are the most common patterns, rewritten as regular expressions for clarity:</td>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"> <span class="sc" style="color: #d14;">'-'</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="kt" style="color: #458; font-weight: 600;">ITminus</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_TILDE</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="kt" style="color: #458; font-weight: 600;">ITtilde</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_BANG</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="kt" style="color: #458; font-weight: 600;">ITbang</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_MINUS</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="kt" style="color: #458; font-weight: 600;">ITprefixminus</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"> <span class="sc" style="color: #d14;">'*'</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;">ITstar</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell"> <span class="sc" style="color: #d14;">'-</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"><</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </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;">ITlarrowtail</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- for arrow notation</span></span>
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"> <span class="sc" style="color: #d14;">'></span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </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;">ITrarrowtail</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- for arrow notation</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">@@ -703,10 +704,21 @@ litpkgname_segment :: { Located FastString }</td>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CONID</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">getCONID</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">special_id</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Parse a minus sign regardless of whether -XLexicalNegation is turned on or off.</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Minus tokens] in GHC.Parser.Lexer</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="kt" style="color: #458; font-weight: 600;">HYPHEN</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">AddAnn</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="sc" style="color: #d14;">'-'</span> <span class="p">{</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnMinus</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_MINUS</span> <span class="p">{</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnMinus</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">VARSYM</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="kr" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">getVARSYM</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"-"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnMinus</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">addError</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Expected a hyphen"</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">}</span> <span class="p">}</span></span>
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716
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"></span>
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706
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">litpkgname</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">FastString</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">litpkgname_segment</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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708
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720
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a bit of a hack, means p - b is parsed same as p-b, enough for now.</span></span>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">litpkgname_segment</span> <span class="sc" style="color: #d14;"><span class="idiff left right">'-'</span></span> <span class="n" style="color: #333;">litpkgname</span> <span class="p">{</span> <span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">appendFS</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">consFS</span> <span class="sc" style="color: #d14;">'-'</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">litpkgname_segment</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HYPHEN</span></span> <span class="n" style="color: #333;">litpkgname</span> <span class="p">{</span> <span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">appendFS</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">consFS</span> <span class="sc" style="color: #d14;">'-'</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC722" class="line" lang="haskell"></span>
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723
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="haskell"><span class="n" style="color: #333;">mayberns</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</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;">LRenaming</span><span class="p">]</span> <span class="p">}</span></span>
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712
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724
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="cm" style="color: #998; font-style: italic;">{- empty -}</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2738" 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="2750" 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">@@ -2738,12 +2750,12 @@ prag_e :: { Located ([AddAnn], HsPragE GhcPs) }</td>
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2738
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2750
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsPragSCC</span> <span class="n" style="color: #333;">noExtField</span></span>
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2739
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getSCC_PRAGs</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
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2740
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2752
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<pre style="margin: 0;"> <span id="LC2752" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StringLiteral</span> <span class="kt" style="color: #458; font-weight: 600;">NoSourceText</span> <span class="p">(</span><span class="n" style="color: #333;">getVARID</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)))</span> <span class="p">}</span></span>
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2741
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<pre style="margin: 0;">-<span id="LC2741" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'{</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">GENERATED'</span> <span class="kt" style="color: #458; font-weight: 600;">STRING</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">':'</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;"><span class="idiff left right">'-'</span></span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">':'</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">'#</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="p">}</span><span class="sc" style="color: #d14;">'</span></span>
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2753
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<pre style="margin: 0;">+<span id="LC2753" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'{</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="o" style="font-weight: 600;">#</span> <span class="kt" style="color: #458; font-weight: 600;">GENERATED'</span> <span class="kt" style="color: #458; font-weight: 600;">STRING</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">':'</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">HYPHEN</span></span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">':'</span> <span class="kt" style="color: #458; font-weight: 600;">INTEGER</span> <span class="sc" style="color: #d14;">'#</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">-</span><span class="p">}</span><span class="sc" style="color: #d14;">'</span></span>
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<pre style="margin: 0;"> <span id="LC2754" class="line" lang="haskell"><span class="sc" style="color: #d14;"> </span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">getINT</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromInteger</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">il_value</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">getINTEGER</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<td class="diff-line-num old_line" data-linenumber="2743" 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">
2743
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<td class="diff-line-num new_line" data-linenumber="2755" 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">
2755
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<pre style="margin: 0;"> <span id="LC2755" class="line" lang="haskell"> <span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span> <span class="o" style="font-weight: 600;">$</span> <span class="p">([</span><span class="n" style="color: #333;">mo</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span></span>
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<td class="diff-line-num old_line" data-linenumber="2744" 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">
2744
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<td class="diff-line-num new_line" data-linenumber="2756" 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">
2756
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<pre style="margin: 0;"> <span id="LC2756" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnColon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">4</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2745" 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">
2745
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<td class="diff-line-num new_line old" data-linenumber="2757" 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="LC2745" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span><span class="p"><span class="idiff left">,</span></span><span class="n" style="color: #333;"><span class="idiff">mj</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">AnnMinus</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff right">6</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="2746" 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">
2746
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<td class="diff-line-num new_line old" data-linenumber="2757" 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="LC2746" class="line" lang="haskell"> <span class="p"><span class="idiff left right">,</span></span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">7</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnColon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">8</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2747" 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="2757" 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">
2757
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<pre style="margin: 0;">+<span id="LC2757" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span><span class="p"><span class="idiff left">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">$</span></span><span class="mi" style="color: #099;"><span class="idiff">6</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">++</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="2747" 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="2758" 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">
2758
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<pre style="margin: 0;">+<span id="LC2758" class="line" lang="haskell"> <span class="p"><span class="idiff left right">[</span></span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">7</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnColon</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">8</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2747" 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">
2747
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<td class="diff-line-num new_line" data-linenumber="2759" 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">
2759
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<pre style="margin: 0;"> <span id="LC2759" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnVal</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">9</span><span class="p">,</span><span class="n" style="color: #333;">mc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">10</span><span class="p">],</span></span>
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<td class="diff-line-num old_line" data-linenumber="2748" 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">
2748
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2760
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<pre style="margin: 0;"> <span id="LC2760" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsPragTick</span> <span class="n" style="color: #333;">noExtField</span></span>
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<td class="diff-line-num old_line" data-linenumber="2749" 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">
2749
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<td class="diff-line-num new_line" data-linenumber="2761" 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">
2761
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<pre style="margin: 0;"> <span id="LC2761" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getGENERATED_PRAGs</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2789" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2789,6 +2801,9 @@ aexp :: { ECP }</td>
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2789
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<td class="diff-line-num new_line" data-linenumber="2801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2801
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<pre style="margin: 0;"> <span id="LC2801" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_BANG</span> <span class="n" style="color: #333;">aexp</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num old_line" data-linenumber="2790" 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">
2790
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<td class="diff-line-num new_line" data-linenumber="2802" 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">
2802
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<pre style="margin: 0;"> <span id="LC2802" class="line" lang="haskell"> <span class="n" style="color: #333;">runECP_PV</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num old_line" data-linenumber="2791" 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">
2791
</td>
<td class="diff-line-num new_line" data-linenumber="2803" 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">
2803
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<pre style="margin: 0;"> <span id="LC2803" class="line" lang="haskell"> <span class="n" style="color: #333;">amms</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsBangPatPV</span> <span class="p">(</span><span class="n" style="color: #333;">comb2</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnBang</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="p">}</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2792" 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="2804" 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">
2804
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<pre style="margin: 0;">+<span id="LC2804" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PREFIX_MINUS</span> <span class="n" style="color: #333;">aexp</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2792" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="2805" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2805
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<pre style="margin: 0;">+<span id="LC2805" class="line" lang="haskell"> <span class="n" style="color: #333;">runECP_PV</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num new old_line" data-linenumber="2792" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="2806" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2806
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<pre style="margin: 0;">+<span id="LC2806" class="line" lang="haskell"> <span class="n" style="color: #333;">amms</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsNegAppPV</span> <span class="p">(</span><span class="n" style="color: #333;">comb2</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$></span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnMinus</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="p">}</span></span>
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2792
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2807
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<pre style="margin: 0;"> <span id="LC2807" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2793" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2793
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<pre style="margin: 0;"> <span id="LC2808" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'</span><span class="se" style="color: #d14;">\\</span><span class="sc" style="color: #d14;">'</span> <span class="n" style="color: #333;">apat</span> <span class="n" style="color: #333;">apats</span> <span class="sc" style="color: #d14;">'-</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">></span><span class="sc" style="color: #d14;">' </span><span class="err" style="color: #a61717; background-color: #e3d2d2;">e</span><span class="n" style="color: #333;">xp</span></span>
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<pre style="margin: 0;"> <span id="LC2809" class="line" lang="haskell"> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</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">@@ -505,19 +505,19 @@ $tab { warnTab }</td>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="plaintext"> 0[bB] @numspc @binary / { ifExtension BinaryLiteralsBit } { tok_num positive 2 2 binary }</span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="plaintext"> 0[oO] @numspc @octal { tok_num positive 2 2 octal }</span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="plaintext"> 0[xX] @numspc @hexadecimal { tok_num positive 2 2 hexadecimal }</span>
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="plaintext"> @negative @decimal / { <span class="idiff left right">ifExtension NegativeLiteralsBit }</span> { tok_num negative 1 1 decimal }</span>
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="plaintext"> @negative 0[bB] @numspc @binary / { <span class="idiff left right">ifExtension NegativeLiteralsBit</span> `alexAndPred`</span>
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="plaintext"> @negative @decimal / { <span class="idiff left right">negLitPred } </span> { tok_num negative 1 1 decimal }</span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="plaintext"> @negative 0[bB] @numspc @binary / { <span class="idiff left right">negLitPred</span> `alexAndPred`</span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="plaintext"> ifExtension BinaryLiteralsBit } { tok_num negative 3 3 binary }</span>
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<pre style="margin: 0;">-<span id="LC511" class="line" lang="plaintext"> @negative 0[oO] @numspc @octal / { <span class="idiff left right">ifExtension NegativeLiteralsBit }</span> { tok_num negative 3 3 octal }</span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="plaintext"> @negative 0[xX] @numspc @hexadecimal / { <span class="idiff left right">ifExtension NegativeLiteralsBit }</span> { tok_num negative 3 3 hexadecimal }</span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="plaintext"> @negative 0[oO] @numspc @octal / { <span class="idiff left right">negLitPred } </span> { tok_num negative 3 3 octal }</span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="plaintext"> @negative 0[xX] @numspc @hexadecimal / { <span class="idiff left right">negLitPred } </span> { tok_num negative 3 3 hexadecimal }</span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="plaintext"> -- Normal rational literals (:: Fractional a => a, from Rational)</span>
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="plaintext"> @floating_point { tok_frac 0 tok_float }</span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="plaintext"> @negative @floating_point / { <span class="idiff left right">ifExtension NegativeLiteralsBit }</span> { tok_frac 0 tok_float }</span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="plaintext"> @negative @floating_point / { <span class="idiff left right">negLitPred } </span> { tok_frac 0 tok_float }</span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="plaintext"> 0[xX] @numspc @hex_floating_point / { ifExtension HexFloatLiteralsBit } { tok_frac 0 tok_hex_float }</span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="plaintext"> @negative 0[xX] @numspc @hex_floating_point</span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="plaintext"> / { ifExtension HexFloatLiteralsBit `alexAndPred`</span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="plaintext"> <span class="idiff left right">ifExtension NegativeLiteralsBit }</span> { tok_frac 0 tok_hex_float }</span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="plaintext"> <span class="idiff left right">negLitPred } </span> { tok_frac 0 tok_hex_float }</span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="plaintext">}</span>
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<pre style="margin: 0;"> <span id="LC523" class="line" lang="plaintext"><0> {</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">@@ -771,7 +771,8 @@ data Token</td>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="plaintext"> | ITrarrow IsUnicodeSyntax</span>
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<pre style="margin: 0;"> <span id="LC772" class="line" lang="plaintext"> | ITlolly IsUnicodeSyntax</span>
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<pre style="margin: 0;"> <span id="LC773" class="line" lang="plaintext"> | ITdarrow IsUnicodeSyntax</span>
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<pre style="margin: 0;">-<span id="LC774" class="line" lang="plaintext"> | ITminus</span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="plaintext"> | ITminus -- See Note [Minus tokens]</span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="plaintext"> | ITprefixminus -- See Note [Minus tokens]</span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="plaintext"> | ITbang -- Prefix (!) only, e.g. f !x = rhs</span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="plaintext"> | ITtilde -- Prefix (~) only, e.g. f ~x = rhs</span>
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<pre style="margin: 0;"> <span id="LC778" class="line" lang="plaintext"> | ITat -- Tight infix (@) only, e.g. f x@pat = rhs</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">@@ -871,6 +872,37 @@ instance Outputable Token where</td>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="plaintext"> ppr x = text (show x)</span>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="plaintext">{- Note [Minus tokens]</span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="plaintext">A minus sign can be used in prefix form (-x) and infix form (a - b).</span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="plaintext">When LexicalNegation is on:</span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="plaintext"> * ITprefixminus represents the prefix form</span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="plaintext"> * ITvarsym "-" represents the infix form</span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="plaintext"> * ITminus is not used</span>
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883
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="plaintext"></span>
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884
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="plaintext">When LexicalNegation is off:</span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="plaintext"> * ITminus represents all forms</span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="plaintext"> * ITprefixminus is not used</span>
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887
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="plaintext"> * ITvarsym "-" is not used</span>
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888
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="plaintext">-}</span>
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889
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="plaintext">{- Note [Why not LexicalNegationBit]</span>
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891
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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892
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="plaintext">One might wonder why we define NoLexicalNegationBit instead of</span>
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893
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="plaintext">LexicalNegationBit. The problem lies in the following line in reservedSymsFM:</span>
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894
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="plaintext"></span>
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895
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="plaintext"> ,("-", ITminus, NormalSyntax, xbit NoLexicalNegationBit)</span>
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896
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="plaintext">We want to generate ITminus only when LexicalNegation is off. How would one</span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="plaintext">do it if we had LexicalNegationBit? I (int-index) tried to use bitwise</span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="plaintext">complement:</span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="plaintext"></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="plaintext"> ,("-", ITminus, NormalSyntax, complement (xbit LexicalNegationBit))</span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="plaintext"></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="plaintext">This did not work, so I opted for NoLexicalNegationBit instead.</span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="plaintext">-}</span>
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905
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="plaintext"></span>
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906
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="plaintext"></span>
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875
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907
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<pre style="margin: 0;"> <span id="LC907" class="line" lang="plaintext">-- the bitmap provided as the third component indicates whether the</span>
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876
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908
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<pre style="margin: 0;"> <span id="LC908" class="line" lang="plaintext">-- corresponding extension keyword is valid under the extension options</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">@@ -975,7 +1007,7 @@ reservedSymsFM = listToUFM $</td>
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975
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1007
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<pre style="margin: 0;"> <span id="LC1007" class="line" lang="plaintext"> ,("<-", ITlarrow NormalSyntax, NormalSyntax, 0 )</span>
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976
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="plaintext"> ,("->", ITrarrow NormalSyntax, NormalSyntax, 0 )</span>
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977
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="plaintext"> ,("=>", ITdarrow NormalSyntax, NormalSyntax, 0 )</span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="plaintext"> ,("-", ITminus, NormalSyntax, <span class="idiff left right">0 </span>)</span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="plaintext"> ,("-", ITminus, NormalSyntax, <span class="idiff left right">xbit NoLexicalNegationBit</span>)</span>
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979
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1011
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="plaintext"></span>
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980
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="plaintext"> ,("*", ITstar NormalSyntax, NormalSyntax, xbit StarIsTypeBit)</span>
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981
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="plaintext"></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">@@ -1156,6 +1188,27 @@ afterOptionalSpace buf p</td>
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1156
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1188
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<pre style="margin: 0;"> <span id="LC1188" class="line" lang="plaintext">atEOL :: AlexAccPred ExtsBitmap</span>
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1157
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="plaintext">atEOL _ _ _ (AI _ buf) = atEnd buf || currentChar buf == '\n'</span>
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1158
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="plaintext"></span>
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1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="plaintext">-- Check if we should parse a negative literal (e.g. -123) as a single token.</span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="plaintext">negLitPred :: AlexAccPred ExtsBitmap</span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="plaintext">negLitPred =</span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="plaintext"> negative_literals `alexOrPred`</span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="plaintext"> (lexical_negation `alexAndPred` prefix_minus)</span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="plaintext"> where</span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="plaintext"> negative_literals = ifExtension NegativeLiteralsBit</span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" class="line" lang="plaintext"></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="plaintext"> lexical_negation =</span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="plaintext"> -- See Note [Why not LexicalNegationBit]</span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="plaintext"> alexNotPred (ifExtension NoLexicalNegationBit)</span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="plaintext"></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="plaintext"> prefix_minus =</span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="plaintext"> -- The condition for a prefix occurrence of an operator is:</span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="plaintext"> --</span>
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1206
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="plaintext"> -- not precededByClosingToken && followedByOpeningToken</span>
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1207
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="plaintext"> --</span>
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1208
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="plaintext"> -- but we don't check followedByOpeningToken here as it holds</span>
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1209
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="plaintext"> -- simply because we immediately lex a literal after the minus.</span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="plaintext"> alexNotPred precededByClosingToken</span>
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1211
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="plaintext"></span>
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1159
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1212
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<pre style="margin: 0;"> <span id="LC1212" class="line" lang="plaintext">ifExtension :: ExtBits -> AlexAccPred ExtsBitmap</span>
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1160
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1213
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<pre style="margin: 0;"> <span id="LC1213" class="line" lang="plaintext">ifExtension extBits bits _ _ _ = extBits `xtest` bits</span>
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1161
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1214
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="plaintext"></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">@@ -1483,6 +1536,9 @@ varsym_prefix = sym $ \exts s -></td>
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1483
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1536
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<pre style="margin: 0;"> <span id="LC1536" class="line" lang="plaintext"> -> return ITdollar</span>
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1484
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1537
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<pre style="margin: 0;"> <span id="LC1537" class="line" lang="plaintext"> | ThQuotesBit `xtest` exts, s == fsLit "$$"</span>
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1485
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1538
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<pre style="margin: 0;"> <span id="LC1538" class="line" lang="plaintext"> -> return ITdollardollar</span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="plaintext"> | s == fsLit "-" -- Only when LexicalNegation is on, otherwise we get ITminus and</span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="plaintext"> -- don't hit this code path. See Note [Minus tokens]</span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="plaintext"> -> return ITprefixminus</span>
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1486
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1542
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<pre style="margin: 0;"> <span id="LC1542" class="line" lang="plaintext"> | s == fsLit "!" -> return ITbang</span>
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1487
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1543
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<pre style="margin: 0;"> <span id="LC1543" class="line" lang="plaintext"> | s == fsLit "~" -> return ITtilde</span>
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1488
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1544
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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="plaintext"> | otherwise -> return (ITvarsym s)</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">@@ -2500,6 +2556,7 @@ data ExtBits</td>
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2500
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2556
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<pre style="margin: 0;"> <span id="LC2556" class="line" lang="plaintext"> | GadtSyntaxBit</span>
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2501
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2557
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<pre style="margin: 0;"> <span id="LC2557" class="line" lang="plaintext"> | ImportQualifiedPostBit</span>
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2502
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2558
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<pre style="margin: 0;"> <span id="LC2558" class="line" lang="plaintext"> | LinearTypesBit</span>
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2559
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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="plaintext"> | NoLexicalNegationBit -- See Note [Why not LexicalNegationBit]</span>
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<pre style="margin: 0;"> <span id="LC2560" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="plaintext"> -- Flags that are updated once parsing starts</span>
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<pre style="margin: 0;"> <span id="LC2562" class="line" lang="plaintext"> | InRulePragBit</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">@@ -2588,12 +2645,14 @@ mkParserFlags' warningFlags extensionFlags homeUnitId</td>
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<pre style="margin: 0;"> <span id="LC2645" class="line" lang="plaintext"> .|. GadtSyntaxBit `xoptBit` LangExt.GADTSyntax</span>
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<pre style="margin: 0;"> <span id="LC2646" class="line" lang="plaintext"> .|. ImportQualifiedPostBit `xoptBit` LangExt.ImportQualifiedPost</span>
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<pre style="margin: 0;"> <span id="LC2647" class="line" lang="plaintext"> .|. LinearTypesBit `xoptBit` LangExt.LinearTypes</span>
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<pre style="margin: 0;">+<span id="LC2648" class="line" lang="plaintext"> .|. NoLexicalNegationBit `xoptNotBit` LangExt.LexicalNegation -- See Note [Why not LexicalNegationBit]</span>
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<pre style="margin: 0;"> <span id="LC2649" class="line" lang="plaintext"> optBits =</span>
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<pre style="margin: 0;"> <span id="LC2650" class="line" lang="plaintext"> HaddockBit `setBitIf` isHaddock</span>
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<pre style="margin: 0;"> <span id="LC2651" class="line" lang="plaintext"> .|. RawTokenStreamBit `setBitIf` rawTokStream</span>
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<pre style="margin: 0;"> <span id="LC2652" class="line" lang="plaintext"> .|. UsePosPragsBit `setBitIf` usePosPrags</span>
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<pre style="margin: 0;"> <span id="LC2653" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2654" class="line" lang="plaintext"> xoptBit bit ext = bit `setBitIf` EnumSet.member ext extensionFlags</span>
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<pre style="margin: 0;">+<span id="LC2655" class="line" lang="plaintext"> xoptNotBit bit ext = bit `setBitIf` not (EnumSet.member ext extensionFlags)</span>
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<pre style="margin: 0;"> <span id="LC2656" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2657" class="line" lang="plaintext"> setBitIf :: ExtBits -> Bool -> ExtsBitmap</span>
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<pre style="margin: 0;"> <span id="LC2658" class="line" lang="plaintext"> b `setBitIf` cond | cond = xbit b</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-notes.rst</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">@@ -164,6 +164,16 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="plaintext"> See :ref:`qualified-do-notation` for more details.</span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="plaintext">* :extension:`LexicalNegation` is a new extension that detects whether the</span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext"> minus sign stands for negation during lexical analysis by checking for the</span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext"> surrounding whitespace: ::</span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext"> a = x - y -- subtraction</span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext"> b = f -x -- negation</span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="plaintext"> f = (- x) -- operator section</span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="plaintext"> c = (-x) -- negation</span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="plaintext">~~~~~~~~</span>
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169
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#f86c1b4986fc1a29572fa45c0cb2eb181d605273"><strong>docs/users_guide/exts/lexical_negation.rst</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">.. _lexical-negation:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Lexical negation</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"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">.. extension:: LexicalNegation</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> :shortdesc: Use whitespace to determine whether the minus sign stands for</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> negation or subtraction.</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> :since: 8.12.1</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> Detect if the minus sign stands for negation during lexical analysis by</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> checking for the surrounding whitespace.</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">In Haskell 2010, the minus sign stands for negation when it has no left-hand</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">side. Consider ``x = - 5`` and ``y = 2 - 5``. In ``x``, there's no expression</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">between the ``=`` and ``-``, so the minus stands for negation, whereas in</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">``y``, there's ``2`` to the left of the minus, therefore it stands for</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">subtraction.</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">This leads to certain syntactic anomalies:</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">* ``(% x)`` is an operator section for any operator ``(%)`` except for ``(-)``.</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> ``(- x)`` is negated ``x`` rather than the right operator section of</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> subtraction. Consequently, it is impossible to write such a section, and</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> users are advised to write ``(subtract x)`` instead.</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">* Negative numbers must be parenthesized when they appear in function argument</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> position. ``f (-5)`` is correct, whereas ``f -5`` is parsed as ``(-) f 5``.</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext">The latter issue is partly mitigated by :extension:`NegativeLiterals`. When it</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">is enabled, ``-5`` is parsed as negative 5 regardless of context, so ``f</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">-5`` works as expected. However, it only applies to literals, so ``f -x`` or</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">``f -(a*2)`` are still parsed as subtraction.</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">With :extension:`LexicalNegation`, both anomalies are resolved:</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext">* ``(% x)`` is an operator section for any operator ``(%)``, no exceptions, as</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> long as there's whitespace between ``%`` and ``x``.</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext">* In ``f -x``, the ``-x`` is parsed as the negation of ``x`` for any</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> syntactically atomic expression ``x`` (variable, literal, or parenthesized</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> expression).</span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext">* The prefix ``-`` binds tighter than any infix operator. ``-a % b`` is parsed</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"> as ``(-a) % b`` regardless of the fixity of ``%``.</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">This means that ``(- x)`` is the right operator section of subtraction, whereas</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">``(-x)`` is the negation of ``x``. Note that these expressions will often have</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">different types (``(- x)`` might have type ``Int -> Int`` while ``(-x)`` will</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">have type ``Int``), and so users mistaking one for the other will likely get a</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext">compile error.</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">Under :extension:`LexicalNegation`, negated literals are desugared without</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">``negate``. That is, ``-123`` stands for ``fromInteger (-123)`` rather than</span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">``negate (fromInteger 123)``. This makes :extension:`LexicalNegation` a valid</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">replacement for :extension:`NegativeLiterals`.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#afc5c9567f619749d27f89c5904b2eb41814069c"><strong>docs/users_guide/exts/negative_literals.rst</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">@@ -27,5 +27,6 @@ as two tokens.</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">One pitfall is that with :extension:`NegativeLiterals`, ``x-1`` will</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">be parsed as ``x`` applied to the argument ``-1``, which is usually</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">not what you want. ``x - 1`` or even ``x- 1`` can be used instead</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext">for subtraction.</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext">for subtraction. To avoid this, consider using :extension:`LexicalNegation`</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext">instead.</span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#cc7795244e6c5ca7ce8a56a7f1f92e9427dcabfb"><strong>docs/users_guide/exts/syntax.rst</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">@@ -25,3 +25,4 @@ Syntax</td>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> block_arguments</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> typed_holes</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> arrows</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> lexical_negation</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#3f7d85c388596f9ef50f1a3e0334bdb67007e969"><strong>libraries/ghc-boot-th/GHC/LanguageExtensions/Type.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">@@ -146,6 +146,7 @@ data Extension</td>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ImportQualifiedPost</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CUSKs</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">StandaloneKindSignatures</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LexicalNegation</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Enum</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Ord' and 'Bounded' are provided for GHC API users (see discussions</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in https://gitlab.haskell.org/ghc/ghc/merge_requests/2707 and</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#9f7a74d3512ab004425ec39cbbcb9737e2ecaa82"><strong>testsuite/tests/driver/T4437.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">@@ -42,6 +42,7 @@ expectedGhcOnlyExtensions =</td>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"> <span class="p">,</span> <span class="s" style="color: #d14;">"AlternativeLayoutRuleTransitional"</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="p">,</span> <span class="s" style="color: #d14;">"LinearTypes"</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="p">,</span> <span class="s" style="color: #d14;">"QualifiedDo"</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="p">,</span> <span class="s" style="color: #d14;">"LexicalNegation"</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="n" style="color: #333;">expectedCabalOnlyExtensions</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">String</span><span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#b800f96dc5df3e1c1ad35199012912cd86e63cd9"><strong>testsuite/tests/parser/should_compile/LexNegVsNegLit.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 NegativeLiterals, LexicalNegation #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></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;">LexNegVsNegLit</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="c1" style="color: #998; font-style: italic;">-- NegativeLiterals specifies that we parse x-1 as x (-1), even though it's</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- considered a shortcoming.</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LexicalNegation does not change that.</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">even</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span> <span class="c1" style="color: #998; font-style: italic;">-- parsed as: even (-1)</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so it is well-typed.</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with LexicalNegation alone, we'd get (-) even 1,</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but NegativeLiterals takes precedence here.</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also: GHC Proposal #344</span></span></pre>
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<li id="cc2173e7bdf27bf351c1842c6d7292484e7f82ac">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#cc2173e7bdf27bf351c1842c6d7292484e7f82ac"><strong>testsuite/tests/parser/should_compile/LexicalNegation.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 LexicalNegation #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></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;">LexicalNegation</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="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">42</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">negx</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">negx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span> <span class="mi" style="color: #099;">5</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">subx</span> <span class="o" style="font-weight: 600;">::</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>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">subx</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">assertion1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">assertion1</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">==</span> <span class="o" style="font-weight: 600;">-</span><span class="p">(</span><span class="mi" style="color: #099;">2</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">x</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#a43397658ba43ce6747320867b3a0330bcea2ea5"><strong>testsuite/tests/parser/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">@@ -152,6 +152,8 @@ test('proposal-229a', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">proposal-229b</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>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">proposal-229d</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>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">proposal-229e</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>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LexicalNegation</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>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LexNegVsNegLit</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>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># We omit 'profasm' because it fails with:</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># Cannot load -prof objects when GHC is built with -dynamic</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#07c2a0ef312669ecb8100fc225982ec371285ed2"><strong>testsuite/tests/parser/should_run/LexNegLit.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 LexicalNegation #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromInteger</span> <span class="kt" style="color: #458; font-weight: 600;">Integer</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FromRational</span> <span class="kt" style="color: #458; font-weight: 600;">Rational</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Negate</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Subtract</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;">fromInteger</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromInteger</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">negate</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Negate</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Subtract</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Fractional</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="n" style="color: #333;">fromRational</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FromRational</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">123</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mf" style="color: #099;">1.5</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">5</span> <span class="kr" style="font-weight: 600;">in</span> <span class="o" style="font-weight: 600;">-</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="mi" style="color: #099;">5</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- unlike NegativeLiterals, we parse it as (5 - 1), not (5 (-1))</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mf" style="color: #099;">0.0</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mo" style="color: #099;">0o10</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="o" style="font-weight: 600;">-</span><span class="mh" style="color: #099;">0x10</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FreeNum</span><span class="p">)</span></span></pre>
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<li id="8c9906c71d4e6eb34d6af0300e5a71e541867c67">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#8c9906c71d4e6eb34d6af0300e5a71e541867c67"><strong>testsuite/tests/parser/should_run/LexNegLit.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">FromInteger (-123)</span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">FromRational ((-3) % 2)</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">Negate (FromInteger 5)</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">FromInteger 5 `Subtract` FromInteger 1</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">Negate (FromInteger 0)</span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">Negate (FromRational (0 % 1))</span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">FromInteger (-8)</span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">FromInteger (-16)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#23b02b5c77944d9957120841eb78b343a4e50e68"><strong>testsuite/tests/parser/should_run/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">@@ -18,3 +18,4 @@ test('CountParserDeps',</td>
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"> <span class="p">[</span> <span class="nv" style="color: #008080;">only_ways</span><span class="p">(['</span><span class="s1" style="color: #d14;">normal</span><span class="p">']),</span> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">('</span><span class="s1" style="color: #d14;">"</span><span class="p">'</span> <span class="o" style="font-weight: 600;">+</span> <span class="nv" style="color: #008080;">config</span><span class="o" style="font-weight: 600;">.</span><span class="nv" style="color: #008080;">libdir</span> <span class="o" style="font-weight: 600;">+</span> <span class="p">'</span><span class="s1" style="color: #d14;">"</span><span class="p">')</span> <span class="p">],</span></span>
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">-package ghc</span><span class="p">'])</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LexNegLit</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa01c77b51422885fbf6d114e23f2ab58bdb1dd5#46ddb8dda2edd2df4717a3285e83997fc812a347"><strong>utils/haddock</strong></a>
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<pre style="margin: 0;">-Subproject commit <span class="idiff left right">54ed6ae2556dc787916e2d56ce0e99808af14e61</span></pre>
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<pre style="margin: 0;">+Subproject commit <span class="idiff left right">9bd65ee47a43529af2ad8e350fdd0c372bc5964c</span></pre>
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