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Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87e2e2b17afed82d30841d5b44c977123b93ecc4">87e2e2b1</a></strong>
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<span>by Vladislav Zavialov</span>
<i>at 2020-09-19T23:55:30+03:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Resolve shift/reduce conflicts with %shift (#17232)
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<h4>1 changed file:</h4>
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compiler/GHC/Parser.y
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<h4>Changes:</h4>
<li id="bf951467d4a9aa443cb109cb4c84a2891945649b">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87e2e2b17afed82d30841d5b44c977123b93ecc4#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">@@ -95,297 +95,398 @@ import GHC.Builtin.Types ( unitTyCon, unitDataCon, tupleTyCon, tupleDataCon, nil</td>
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<pre style="margin: 0;"> <span id="LC95" 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="LC96" class="line" lang="haskell"><span class="p">}</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="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">expect</span> <span class="mi" style="color: #099;"><span class="idiff left right">232</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="LC98" 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;"><span class="idiff left right">0</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="LC99" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC100" 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="LC100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [shift/reduce conflicts]</span></span>
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The 'happy' tool turns this grammar into an efficient parser that follows the</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shift-reduce parsing model. There's a parse stack that contains items parsed so</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">far (both terminals and non-terminals). Every next token produced by the lexer</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">results in one of two actions:</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If you modify this parser and add a conflict, please update this comment.</span></span>
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You can learn more about the conflicts by passing 'happy' the -i flag:</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> SHIFT: push the token onto the parse stack</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> happy -agc --strict compiler/GHC/Parser.y -idetailed-info</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> REDUCE: pop a few items off the parse stack and combine them</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with a function (reduction rule)</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"></span>
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107
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How is this section formatted? Look up the state the conflict is</span></span>
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108
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reported at, and copy the list of applicable rules (at the top, without the</span></span>
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109
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rule numbers). Mark *** for the rule that is the conflicting reduction (that</span></span>
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110
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is, the interpretation which is NOT taken). NB: Happy doesn't print a rule</span></span>
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111
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in a state if it is empty, but you should include it in the list (you can</span></span>
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112
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">look these up in the Grammar section of the info file).</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, sometimes it's unclear which of the two actions to take.</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this code example:</span></span>
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113
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114
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"></span>
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114
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Obviously the state numbers are not stable across modifications to the parser,</span></span>
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115
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the idea is to reproduce enough information on each conflict so you can figure</span></span>
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116
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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">out what happened if the states were renumbered. Try not to gratuitously move</span></span>
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117
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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">productions around in this file.</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if x then y else f z</span></span>
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118
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116
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
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119
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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120
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"></span>
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121
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 60 contains 1 shift/reduce conflict.</span></span>
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122
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"></span>
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123
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> context -> btype .</span></span>
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124
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** type -> btype .</span></span>
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125
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type -> btype . '->' ctype</span></span>
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126
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflicts: '->'</span></span>
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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 61 contains 46 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"></span>
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133
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** btype -> tyapps .</span></span>
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134
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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tyapps -> tyapps . tyapp</span></span>
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135
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"></span>
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136
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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflicts: '_' ':' '~' '!' '.' '`' '{' '[' '(' '(#' '`' TYPEAPP</span></span>
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137
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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> SIMPLEQUOTE VARID CONID VARSYM CONSYM QCONID QVARSYM QCONSYM</span></span>
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138
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> STRING INTEGER TH_ID_SPLICE '$(' TH_QUASIQUOTE TH_QQUASIQUOTE</span></span>
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139
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and all the special ids.</span></span>
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140
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"></span>
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141
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity:</span></span>
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142
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else z :: F a'</span></span>
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143
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"></span>
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144
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shift parses as (per longest-parse rule):</span></span>
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145
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else z :: (F a)'</span></span>
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146
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"></span>
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147
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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148
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"></span>
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149
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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 143 contains 14 shift/reduce conflicts.</span></span>
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150
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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"></span>
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151
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '::' sigtype</span></span>
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152
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '-<' exp</span></span>
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153
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '>-' exp</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '-<<' exp</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '>>-' exp</span></span>
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156
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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** exp -> infixexp .</span></span>
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157
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infixexp -> infixexp . qop exp10</span></span>
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158
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"></span>
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159
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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflicts: ':' '::' '-' '!' '-<' '>-' '-<<' '>>-'</span></span>
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160
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> '.' '`' '*' VARSYM CONSYM QVARSYM QCONSYM</span></span>
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161
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"></span>
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162
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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples of ambiguity:</span></span>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else z -< e'</span></span>
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164
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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else z :: T'</span></span>
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165
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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else z + 1' (NB: '+' is in VARSYM)</span></span>
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166
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"></span>
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167
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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shift parses as (per longest-parse rule):</span></span>
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168
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else (z -< T)'</span></span>
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169
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else (z :: T)'</span></span>
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170
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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else (z + 1)'</span></span>
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171
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are two ways to parse it:</span></span>
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173
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118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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174
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 146 contains 66 shift/reduce conflicts.</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (if x then y else f) z</span></span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if x then y else (f z)</span></span>
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175
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** exp10 -> fexp .</span></span>
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . aexp</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . TYPEAPP atype</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How is this determined? At some point, the parser gets to the following state:</span></span>
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179
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123
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflicts: TYPEAPP and all the tokens that can start an aexp</span></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> parse stack: 'if' exp 'then' exp 'else' "f"</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: "z"</span></span>
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126
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples of ambiguity:</span></span>
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183
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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else f z'</span></span>
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184
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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'if x then y else f @ z'</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Scenario A (simplified):</span></span>
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185
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128
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"></span>
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186
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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Shift parses as (per longest-parse rule):</span></span></span>
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187
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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">'if x then y else (f z)'</span></span></span>
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188
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">'if x then y else (f @ z)'</span></span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> 1. REDUCE, parse stack: 'if' exp 'then' exp 'else' exp</span></span></span>
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> next token: "z"</span></span></span>
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> (Note that "f" reduced to exp here)</span></span></span>
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132
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. REDUCE, parse stack: exp</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: "z"</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 200 contains 27 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. SHIFT, parse stack: exp "z"</span></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: ...</span></span>
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> TH_TY_QUOTE . tyvar</span></span>
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> TH_TY_QUOTE . gtycon</span></span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** aexp2 -> TH_TY_QUOTE .</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4. REDUCE, parse stack: exp</span></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: ...</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> Conflicts: two single quotes is error syntax with specific error message.</span></span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">This way we get: (if x then y else f) z</span></span></span>
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143
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"></span>
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200
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example of ambiguity:</span></span>
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201
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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'x = '''</span></span>
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202
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'x = ''a'</span></span>
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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'x = ''T'</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Scenario B (simplified):</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shift parses as (per longest-parse rule):</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'x = ''a'</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'x = ''T'</span></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. SHIFT, parse stack: 'if' exp 'then' exp 'else' "f" "z"</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: ...</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. REDUCE, parse stack: 'if' exp 'then' exp 'else' exp</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: ...</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 294 contains 1 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. REDUCE, parse stack: exp</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> next token: ...</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> rule -> STRING . rule_activation rule_forall infixexp '=' exp</span></span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">This way we get: if x then y else (f z)</span></span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: '[' (empty rule_activation reduces)</span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The end result is determined by the chosen action. When Happy detects this, it</span></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reports a shift/reduce conflict. At the top of the file, we have the following</span></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">directive:</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't know whether the '[' starts the activation or not: it</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">might be the start of the declaration with the activation being</span></span>
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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">empty. --SDM 1/4/2002</span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> %expect 0</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity:</span></span>
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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> '{-# RULE [0] f = ... #-}'</span></span>
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It means that we expect no unresolved shift/reduce conflicts in this grammar.</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If you modify the grammar and get shift/reduce conflicts, follow the steps</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">below to resolve them.</span></span>
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We parse this as having a [0] rule activation for rewriting 'f', rather</span></span>
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225
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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a rule instructing how to rewrite the expression '[0] f'.</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP ONE</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is to figure out what causes the conflict.</span></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That's where the -i flag comes in handy:</span></span>
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-------------------------------------------------------------------------------</span></span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> happy -agc --strict compiler/GHC/Parser.y -idetailed-info</span></span></span>
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 305 contains 1 shift/reduce conflict.</span></span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> By analysing the output of this command, in a new file `detailed-info`, you</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can figure out which reduction rule causes the issue. At the top of the</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> generated report, you will see a line like this:</span></span>
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230
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** type -> btype .</span></span>
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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type -> btype . '->' ctype</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> state 147 contains 67 shift/reduce conflicts.</span></span>
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: '->'</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Scroll down to section State 147 (in your case it could be a different</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> state). The start of the section lists the reduction rules that can fire</span></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and shows their context:</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"></span>
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236
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Same as state 61 but without contexts.</span></span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp10 -> fexp . (rule 492)</span></span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . aexp (rule 498)</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . PREFIX_AT atype (rule 499)</span></span>
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237
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"></span>
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238
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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-------------------------------------------------------------------------------</span></span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> And then, for every token, it tells you the parsing action:</span></span></span>
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239
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"></span>
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240
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 349 contains 1 shift/reduce conflicts.</span></span>
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189
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ']' reduce using rule 492</span></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> '::' reduce using rule 492</span></span>
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191
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> '(' shift, and enter state 178</span></span>
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192
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> QVARID shift, and enter state 44</span></span>
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193
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> DO shift, and enter state 182</span></span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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241
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195
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"></span>
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242
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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tup_exprs -> commas . tup_tail</span></span>
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243
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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sysdcon_nolist -> '(' commas . ')'</span></span>
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244
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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> commas -> commas . ','</span></span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But if you look closer, some of these tokens also have another parsing action</span></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in parentheses:</span></span>
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245
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"></span>
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246
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: ')' (empty tup_tail reduces)</span></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> QVARID shift, and enter state 44</span></span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (reduce using rule 492)</span></span>
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A tuple section with NO free variables '(,,)' is indistinguishable</span></span>
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249
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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from the Haskell98 data constructor for a tuple. Shift resolves in</span></span>
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250
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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">favor of sysdcon, which is good because a tuple section will get rejected</span></span>
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251
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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if -XTupleSections is not specified.</span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That's how you know rule 492 is causing trouble.</span></span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Scroll back to the top to see what this rule is:</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [ExplicitTuple] in GHC.Hs.Expr.</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ----------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Grammar</span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ----------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp10 -> fexp (492)</span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> optSemi -> ';' (493)</span></span>
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212
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-------------------------------------------------------------------------------</span></span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> Hence the shift/reduce conflict is caused by this parser production:</span></span></span>
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<pre style="margin: 0;"> <span id="LC216" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 407 contains 1 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp10 :: { ECP }</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> : '-' fexp { ... }</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | fexp { ... } -- problematic rule</span></span>
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258
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220
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"></span>
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259
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<pre style="margin: 0;">-<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tup_exprs -> commas . tup_tail</span></span>
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260
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<pre style="margin: 0;">-<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sysdcon_nolist -> '(#' commas . '#)'</span></span>
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261
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> commas -> commas . ','</span></span>
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221
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP TWO</span></span>
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222
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is to mark the problematic rule with the %shift pragma. This signals to</span></span>
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223
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'happy' that any shift/reduce conflicts involving this rule must be resolved</span></span>
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224
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in favor of a shift. There's currently no dedicated pragma to resolve in</span></span>
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225
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> favor of the reduce.</span></span>
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262
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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell"></span>
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263
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: '#)' (empty tup_tail reduces)</span></span>
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227
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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP THREE</span></span>
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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is to add a dedicated Note for this specific conflict, as is done for all</span></span>
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229
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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> other conflicts below.</span></span>
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230
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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264
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231
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></span>
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265
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Same as State 354 for unboxed tuples.</span></span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: rule_activation -> {- empty -}]</span></span>
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233
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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234
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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235
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule -> STRING . rule_activation rule_foralls infixexp '=' exp</span></span>
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266
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236
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"></span>
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267
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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238
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "name" [0] f = rhs #-}</span></span>
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268
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239
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"></span>
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269
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 416 contains 66 shift/reduce conflicts.</span></span>
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240
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, then we'd get an empty activation rule, and [0] would be</span></span>
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242
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> parsed as part of the left-hand side expression.</span></span>
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270
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243
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="haskell"></span>
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271
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** exp10 -> '-' fexp .</span></span>
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272
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . aexp</span></span>
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273
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<pre style="margin: 0;">-<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . TYPEAPP atype</span></span>
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244
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift, so [0] is parsed as an activation rule.</span></span>
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245
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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274
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246
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"></span>
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275
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<pre style="margin: 0;">-<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Same as 146 but with a unary minus.</span></span>
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247
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: rule_foralls -> 'forall' rule_vars '.']</span></span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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249
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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250
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule_foralls -> 'forall' rule_vars '.' . 'forall' rule_vars '.'</span></span>
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251
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule_foralls -> 'forall' rule_vars '.' .</span></span>
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276
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252
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"></span>
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277
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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253
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "name" forall a1. forall a2. lhs = rhs #-}</span></span>
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278
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255
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 472 contains 1 shift/reduce conflict.</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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257
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Same as in Note [%shift: rule_foralls -> {- empty -}]</span></span>
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258
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but for the second 'forall'.</span></span>
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259
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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280
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260
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"></span>
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281
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<pre style="margin: 0;">-<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> oqtycon -> '(' qtyconsym . ')'</span></span>
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282
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<pre style="margin: 0;">-<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** qtyconop -> qtyconsym .</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: rule_foralls -> {- empty -}]</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule -> STRING rule_activation . rule_foralls infixexp '=' exp</span></span>
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283
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265
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"></span>
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284
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<pre style="margin: 0;">-<span id="LC284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: ')'</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> {-# RULES "name" forall a1. lhs = rhs #-}</span></span>
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285
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"></span>
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286
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<pre style="margin: 0;">-<span id="LC286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity: 'foo :: (:%)'</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, then we would get an empty rule_foralls; the 'forall', being</span></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a valid term-level identifier, would be parsed as part of the left-hand</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> side expression.</span></span>
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287
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273
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"></span>
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288
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<pre style="margin: 0;">-<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Shift means '(:%)' gets parsed as a type constructor, rather than than a</span></span></span>
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289
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">parenthesized infix type expression of length 1.</span></span></span>
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> We shift, so the 'forall' is parsed as part of rule_foralls.</span></span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-}</span></span></span>
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276
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: type -> btype]</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> context -> btype .</span></span>
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281
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type -> btype .</span></span>
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282
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type -> btype . '->' ctype</span></span>
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283
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type -> btype . '#->' ctype</span></span>
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284
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 665 contains 1 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a :: Maybe Integer -> Bool</span></span>
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294
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287
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** aexp2 -> ipvar .</span></span>
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296
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<pre style="margin: 0;">-<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dbind -> ipvar . '=' exp</span></span>
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288
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, we would get: (a :: Maybe Integer) -> Bool</span></span>
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290
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift to get this instead: a :: (Maybe Integer -> Bool)</span></span>
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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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292
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: '='</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: infixtype -> ftype]</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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295
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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296
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infixtype -> ftype .</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infixtype -> ftype . tyop infixtype</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ftype -> ftype . tyarg</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ftype -> ftype . PREFIX_AT tyarg</span></span>
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300
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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302
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a :: Maybe Integer</span></span>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"></span>
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304
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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305
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, we would get: (a :: Maybe) Integer</span></span>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift to get this instead: a :: (Maybe Integer)</span></span>
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307
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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299
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308
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"></span>
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300
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity: 'let ?x ...'</span></span>
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309
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: atype -> tyvar]</span></span>
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310
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> atype -> tyvar .</span></span>
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313
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tv_bndr_no_braces -> '(' tyvar . '::' kind ')'</span></span>
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301
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314
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"></span>
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302
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The parser can't tell whether the ?x is the lhs of a normal binding or</span></span>
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303
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">an implicit binding. Fortunately, resolving as shift gives it the only</span></span>
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304
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<pre style="margin: 0;">-<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sensible meaning, namely the lhs of an implicit binding.</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where type D a = (a :: Type ...</span></span>
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317
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"></span>
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306
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<pre style="margin: 0;">-<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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318
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, we could specify a default for an associated type like this:</span></span>
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307
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320
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"></span>
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308
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<pre style="margin: 0;">-<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 750 contains 1 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where type D a</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type D a = (a :: Type)</span></span>
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309
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> rule -> STRING rule_activation . rule_forall infixexp '=' exp</span></span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">But we shift in order to allow injectivity signatures like this:</span></span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: 'forall' (empty rule_forall reduces)</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where type D a = (r :: Type) | r -> a</span></span>
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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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313
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328
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="haskell"></span>
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314
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<pre style="margin: 0;">-<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity: '{-# RULES "name" forall = ... #-}'</span></span>
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329
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: exp -> infixexp]</span></span>
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330
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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331
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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332
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '::' sigtype</span></span>
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333
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '-<' exp</span></span>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '>-' exp</span></span>
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335
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '-<<' exp</span></span>
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336
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp . '>>-' exp</span></span>
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337
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp -> infixexp .</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infixexp -> infixexp . qop exp10p</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"></span>
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340
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples:</span></span>
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341
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) if x then y else z -< e</span></span>
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342
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) if x then y else z :: T</span></span>
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343
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3) if x then y else z + 1 -- (NB: '+' is in VARSYM)</span></span>
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344
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"></span>
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345
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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346
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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, we would get:</span></span>
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347
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"></span>
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348
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) (if x then y else z) -< e</span></span>
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349
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) (if x then y else z) :: T</span></span>
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350
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3) (if x then y else z) + 1</span></span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"></span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift to get this instead:</span></span>
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353
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"></span>
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354
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) if x then y else (z -< e)</span></span>
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355
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) if x then y else (z :: T)</span></span>
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356
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3) if x then y else (z + 1)</span></span>
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357
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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315
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358
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"></span>
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316
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<pre style="margin: 0;">-<span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">'forall' is a valid variable name---we don't know whether</span></span></span>
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<pre style="margin: 0;">-<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">to treat a forall on the input as the beginning of a quantifier</span></span></span>
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<pre style="margin: 0;">-<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">or the beginning of the rule itself. Resolving to shift means</span></span></span>
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<pre style="margin: 0;">-<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">it's always treated as a quantifier, hence the above is disallowed</span>.</span></span>
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">This saves explicitly defining a grammar for the rule lhs that</span></span></span>
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<pre style="margin: 0;">-<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">doesn't include 'forall'.</span></span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- Note [%shift: exp10 -> '-' fexp]</span></span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Context:</span></span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> exp10 -> '-' fexp </span>.</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> fexp -> fexp . aexp</span></span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> fexp -> fexp . PREFIX_AT atype</span></span></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples & Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Same as in Note [%shift: exp10 -> fexp],</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but with a '-' in front.</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 986 contains 1 shift/reduce conflicts.</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: exp10 -> fexp]</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exp10 -> fexp .</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . aexp</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fexp -> fexp . PREFIX_AT atype</span></span>
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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> transformqual -> 'then' 'group' . 'using' exp</span></span></span>
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<pre style="margin: 0;">-<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> transformqual -> 'then' 'group' . 'by' exp 'using' exp</span></span></span>
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329
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<pre style="margin: 0;">-<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">*** special_id -> 'group' .</span></span></span>
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378
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Examples:</span></span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">1) if x then y else f z</span></span></span>
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380
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">2) if x then y else f @z</span></span></span>
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381
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: 'by'</span></span>
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382
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, we would get:</span></span>
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384
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) (if x then y else f) z</span></span>
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) (if x then y else f) @z</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">state 1084 contains 1 shift/reduce conflicts.</span></span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> We shift to get this instead:</span></span></span>
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389
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rule_foralls -> 'forall' rule_vars '.' . 'forall' rule_vars '.'</span></span>
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338
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** rule_foralls -> 'forall' rule_vars '.' .</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) if x then y else (f z)</span></span>
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391
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) if x then y else (f @z)</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: 'forall'</span></span>
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<pre style="margin: 0;">+<span id="LC394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: aexp2 -> ipvar]</span></span>
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395
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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396
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> ipvar .</span></span>
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398
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<pre style="margin: 0;">+<span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dbind -> ipvar . '=' exp</span></span>
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341
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399
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"></span>
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342
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity: '{-# RULES "name" forall a. forall ... #-}'</span></span>
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400
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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401
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let ?x = ...</span></span>
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343
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402
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"></span>
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344
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here the parser cannot tell whether the second 'forall' is the beginning of</span></span>
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345
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a term-level quantifier, for example:</span></span>
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403
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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404
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, ?x would be parsed as the LHS of a normal binding,</span></span>
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405
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> eventually producing an error.</span></span>
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346
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406
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"></span>
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347
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'{-# RULES "name" forall a. forall x. id @a x = x #-}'</span></span>
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407
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift, so it is parsed as the LHS of an implicit binding.</span></span>
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408
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<pre style="margin: 0;">+<span id="LC408" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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348
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409
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"></span>
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349
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or a valid variable named 'forall', for example a function @:: Int -> Int@</span></span>
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410
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: aexp2 -> TH_TY_QUOTE]</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> TH_TY_QUOTE . tyvar</span></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> TH_TY_QUOTE . gtycon</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aexp2 -> TH_TY_QUOTE .</span></span>
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416
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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell"></span>
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351
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<pre style="margin: 0;">-<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'{-# RULES "name" forall a. forall 0 = 0 #-}'</span></span>
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417
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples:</span></span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1) x = ''</span></span>
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419
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2) x = ''a</span></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3) x = ''T</span></span>
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421
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shift means the parser only allows the former. Also see conflict 753 above.</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, the '' would result in reportEmptyDoubleQuotes even when</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> followed by a type variable or a type constructor. But the only reason</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this reduction rule exists is to improve error messages.</span></span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Naturally, we shift instead, so that ''a and ''T work as expected.</span></span>
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428
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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429
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 1285 contains 1 shift/reduce conflict.</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: tup_tail -> {- empty -}]</span></span>
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431
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tup_exprs -> commas . tup_tail</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sysdcon_nolist -> '(' commas . ')'</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> sysdcon_nolist -> '(#' commas . '#)'</span></span>
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436
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> commas -> commas . ','</span></span>
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437
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constrs1 -> constrs1 maybe_docnext '|' . maybe_docprev constr</span></span>
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438
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (,,)</span></span>
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440
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"></span>
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361
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: DOCPREV</span></span>
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441
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> A tuple section with no components is indistinguishable from the Haskell98</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data constructor for a tuple.</span></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, (,,) would be parsed as a tuple section.</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift, so (,,) is parsed as a data constructor.</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">state 1375 contains 1 shift/reduce conflict.</span></span>
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448
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is preferable because we want to accept (,,) without -XTupleSections.</span></span>
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449
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See also Note [ExplicitTuple] in GHC.Hs.Expr.</span></span>
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450
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<pre style="margin: 0;">+<span id="LC450" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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366
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451
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"></span>
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367
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *** atype -> tyvar .</span></span>
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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tv_bndr -> '(' tyvar . '::' kind ')'</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: qtyconop -> qtyconsym]</span></span>
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453
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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454
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> oqtycon -> '(' qtyconsym . ')'</span></span>
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456
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> qtyconop -> qtyconsym .</span></span>
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457
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Conflict: '::'</span></span>
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458
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: (:%)</span></span>
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460
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example ambiguity: 'class C a where type D a = ( a :: * ...'</span></span>
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461
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, (:%) would be parsed as a parenthehsized infix type</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> expression without arguments, resulting in the 'failOpFewArgs' error.</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Here the parser cannot tell whether this is specifying a default for the</span></span></span>
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375
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">associated type like:</span></span></span>
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> We shift, so it is parsed as a type constructor.</span></span></span>
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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">-}</span></span></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"></span>
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377
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'class C a where type D a = ( a :: * ); type D a'</span></span>
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<pre style="margin: 0;">+<span id="LC468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [%shift: special_id -> 'group']</span></span>
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<pre style="margin: 0;">+<span id="LC469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Context:</span></span>
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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> transformqual -> 'then' 'group' . 'using' exp</span></span>
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<pre style="margin: 0;">+<span id="LC472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> transformqual -> 'then' 'group' . 'by' exp 'using' exp</span></span>
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473
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> special_id -> 'group' .</span></span>
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378
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474
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"></span>
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379
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or it is an injectivity signature like:</span></span>
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<pre style="margin: 0;">+<span id="LC475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Example:</span></span>
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<pre style="margin: 0;">+<span id="LC476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [ ... | then group by dept using groupWith</span></span>
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477
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , then take 5 ]</span></span>
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478
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'class C a where type D a = ( r :: * ) | r -> a'</span></span>
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479
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Ambiguity:</span></span>
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we reduced, 'group' would be parsed as a term-level identifier, just as</span></span>
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481
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'take' in the other clause.</span></span>
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482
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Shift means the parser only allows the latter.</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We shift, so it is parsed as part of the 'group by' clause introduced by</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the -XTransformListComp extension.</span></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-------------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- API Annotations</span></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--</span></span>
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388
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487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Parser API Annotations]</span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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389
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490
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A lot of the productions are now cluttered with calls to</span></span>
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390
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491
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">aa,am,ams,amms etc.</span></span>
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391
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492
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="405" 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="506" 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">@@ -405,9 +506,10 @@ If you modify the parser and want to ensure that the API annotations are process</td>
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405
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506
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">correctly, see the README in (REPO)/utils/check-api-annotations for details on</span></span>
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406
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507
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">how to set up a test using the check-api-annotations utility, and interpret the</span></span>
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407
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508
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">output it generates.</span></span>
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509
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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408
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510
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"></span>
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409
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Parsing lists]</span></span>
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410
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<pre style="margin: 0;">-<span id="LC410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">---------------------</span></span></span>
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511
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- </span>Note [Parsing lists]</span></span>
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512
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">~~~~~~~~~~~~~~~~~~~~~~~</span></span></span>
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411
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513
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might be wondering why we spend so much effort encoding our lists this</span></span>
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412
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514
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way:</span></span>
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413
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515
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="447" 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="549" 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">@@ -447,9 +549,6 @@ are the most common patterns, rewritten as regular expressions for clarity:</td>
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447
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549
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Equivalent to x (',' x)+ (non-empty, no trailing semis)</span></span>
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448
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550
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> xs : x</span></span>
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449
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551
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | x ',' xs</span></span>
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450
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"></span>
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451
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<pre style="margin: 0;">-<span id="LC451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-- -----------------------------------------------------------------------------</span></span>
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452
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<pre style="margin: 0;">-<span id="LC452" class="line" lang="haskell"></span>
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453
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552
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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454
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553
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"></span>
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554
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"><span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">token</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">@@ -1681,7 +1780,8 @@ rule :: { LRuleDecl GhcPs }</td>
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"></span>
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1682
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Rules can be specified to be NeverActive, unlike inline/specialize pragmas</span></span>
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1683
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<pre style="margin: 0;"> <span id="LC1782" class="line" lang="haskell"><span class="n" style="color: #333;">rule_activation</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="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Activation</span><span class="p">)</span> <span class="p">}</span></span>
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1684
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<pre style="margin: 0;">-<span id="LC1684" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: rule_activation -> {- empty -}]</span></span>
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<pre style="margin: 0;">+<span id="LC1784" 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="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span> <span class="p">}</span></span>
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1685
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<pre style="margin: 0;"> <span id="LC1785" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">rule_explicit_activation</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="p">}</span></span>
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1686
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1786
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"></span>
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1687
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1787
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<pre style="margin: 0;"> <span id="LC1787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This production is used to parse the tilde syntax in pragmas such as</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1717,9 +1817,12 @@ rule_foralls :: { ([AddAnn], Maybe [LHsTyVarBndr () GhcPs], [LRuleBndr GhcPs]) }</td>
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1717
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1817
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<pre style="margin: 0;"> <span id="LC1817" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">return</span> <span class="p">([</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnForall</span> <span class="o" style="font-weight: 600;">$</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;">AnnDot</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">,</span></span>
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1818
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<pre style="margin: 0;"> <span id="LC1818" class="line" lang="haskell"> <span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnForall</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">4</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnDot</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">6</span><span class="p">],</span></span>
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1719
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1819
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">mkRuleTyVarBndrs</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">),</span> <span class="n" style="color: #333;">mkRuleBndrs</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">5</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1720" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'f</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">o</span><span class="n" style="color: #333;">rall'</span> <span class="n" style="color: #333;">rule_vars</span> <span class="sc" style="color: #d14;">'.'</span> <span class="p">{</span> <span class="p">([</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnForall</span> <span class="o" style="font-weight: 600;">$</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;">AnnDot</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">],</span></span>
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: rule_foralls -> 'forall' rule_vars '.']</span></span>
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'f</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">o</span><span class="n" style="color: #333;">rall'</span> <span class="n" style="color: #333;">rule_vars</span> <span class="sc" style="color: #d14;">'.'</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="p">([</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnForall</span> <span class="o" style="font-weight: 600;">$</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;">AnnDot</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">],</span></span>
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<pre style="margin: 0;"> <span id="LC1823" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">mkRuleBndrs</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="p">}</span></span>
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1722
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<pre style="margin: 0;">-<span id="LC1722" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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1824
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<pre style="margin: 0;">+<span id="LC1824" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: rule_foralls -> {- empty -}]</span></span>
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1825
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<pre style="margin: 0;">+<span id="LC1825" 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="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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1723
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1826
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<pre style="margin: 0;"> <span id="LC1826" class="line" lang="haskell"></span>
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1724
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1827
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<pre style="margin: 0;"> <span id="LC1827" class="line" lang="haskell"><span class="n" style="color: #333;">rule_vars</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;">LRuleTyTmVar</span><span class="p">]</span> <span class="p">}</span></span>
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1725
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1828
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<pre style="margin: 0;"> <span id="LC1828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">rule_var</span> <span class="n" style="color: #333;">rule_vars</span> <span class="p">{</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="mi" style="color: #099;">2</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1953" 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="2056" 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">@@ -1953,7 +2056,8 @@ is connected to the first type too.</td>
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1953
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2056
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1954
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2057
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<pre style="margin: 0;"> <span id="LC2057" class="line" lang="haskell"></span>
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1955
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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1956
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<pre style="margin: 0;">-<span id="LC1956" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">btype</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2059
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<pre style="margin: 0;">+<span id="LC2059" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: type -> btype]</span></span>
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2060
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<pre style="margin: 0;">+<span id="LC2060" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">btype</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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1957
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">btype</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;">c</span><span class="kr" style="font-weight: 600;">type</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnRarrow</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See note [GADT decl discards annotations]</span></span>
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1958
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">ams</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;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsFunTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">HsUnrestrictedArrow</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">)</span></span>
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1959
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2063
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<pre style="margin: 0;"> <span id="LC2063" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnRarrow</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1969" 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="2073" 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">@@ -1969,7 +2073,8 @@ btype :: { LHsType GhcPs }</td>
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1969
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2073
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<pre style="margin: 0;"> <span id="LC2073" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">infixtype</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">runPV</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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1970
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2074
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<pre style="margin: 0;"> <span id="LC2074" class="line" lang="haskell"></span>
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1971
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2075
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<pre style="margin: 0;"> <span id="LC2075" class="line" lang="haskell"><span class="n" style="color: #333;">infixtype</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">DisambTD</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">PV</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">}</span></span>
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1972
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<pre style="margin: 0;">-<span id="LC1972" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ftype</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2076
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<pre style="margin: 0;">+<span id="LC2076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: infixtype -> ftype]</span></span>
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2077
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<pre style="margin: 0;">+<span id="LC2077" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ftype</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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1973
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2078
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<pre style="margin: 0;"> <span id="LC2078" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ftype</span> <span class="n" style="color: #333;">tyop</span> <span class="n" style="color: #333;">infixtype</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span></span>
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1974
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2079
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<pre style="margin: 0;"> <span id="LC2079" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</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;">$</span><span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num old_line" data-linenumber="1975" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1975
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2080
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<pre style="margin: 0;"> <span id="LC2080" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHsOpTyPV</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1998" 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="2103" 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">@@ -1998,7 +2103,8 @@ tyop :: { Located RdrName }</td>
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1998
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2103
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<pre style="margin: 0;"> <span id="LC2103" class="line" lang="haskell"></span>
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1999
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<td class="diff-line-num new_line" data-linenumber="2104" 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">
2104
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<pre style="margin: 0;"> <span id="LC2104" class="line" lang="haskell"><span class="n" style="color: #333;">atype</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="p">}</span></span>
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2000
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2105
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<pre style="margin: 0;"> <span id="LC2105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ntgtycon</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">NotPromoted</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Not including unit tuples</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2001" 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">
2001
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<td class="diff-line-num new_line old" data-linenumber="2106" 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="LC2001" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">NotPromoted</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- (See Note [Unit tuples])</span></span>
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2106
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<pre style="margin: 0;">+<span id="LC2106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: atype -> tyvar]</span></span>
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2107
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<pre style="margin: 0;">+<span id="LC2107" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">NotPromoted</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- (See Note [Unit tuples])</span></span>
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2002
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2108
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<pre style="margin: 0;"> <span id="LC2108" 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="o" style="font-weight: 600;">%</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">warnStarIsType</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span></span>
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2003
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2109
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<pre style="margin: 0;"> <span id="LC2109" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsStarTy</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="n" style="color: #333;">isUnicode</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="p">}</span> <span class="p">}</span></span>
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2004
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2110
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2482" 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="2588" 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">@@ -2482,7 +2588,8 @@ exp :: { ECP }</td>
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2482
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2588
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<pre style="margin: 0;"> <span id="LC2588" class="line" lang="haskell"> <span class="n" style="color: #333;">ams</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;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsCmdArrApp</span> <span class="n" style="color: #333;">noExtField</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span></span>
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2483
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2589
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<pre style="margin: 0;"> <span id="LC2589" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsHigherOrderApp</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2590" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mu</span> <span class="kt" style="color: #458; font-weight: 600;">AnnRarrowtail</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">infixexp</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2591" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: exp -> infixexp]</span></span>
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<pre style="margin: 0;">+<span id="LC2592" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">infixexp</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2486
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2593
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<pre style="margin: 0;"> <span id="LC2593" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">exp_prag</span><span class="p">(</span><span class="n" style="color: #333;">exp</span><span class="p">)</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Pragmas and operator fixity]</span></span>
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2487
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2594
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"></span>
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2595
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<pre style="margin: 0;"> <span id="LC2595" class="line" lang="haskell"><span class="n" style="color: #333;">infixexp</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2510,11 +2617,13 @@ exp_prag(e) :: { ECP }</td>
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2510
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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2618
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<pre style="margin: 0;"> <span id="LC2618" class="line" lang="haskell"></span>
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2512
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<pre style="margin: 0;"> <span id="LC2619" class="line" lang="haskell"><span class="n" style="color: #333;">exp10</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="p">}</span></span>
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2513
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<pre style="margin: 0;">-<span id="LC2513" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="sc" style="color: #d14;">'-'</span> <span class="n" style="color: #333;">fexp</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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2620
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<pre style="margin: 0;">+<span id="LC2620" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: exp10 -> '-' fexp]</span></span>
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2621
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<pre style="margin: 0;">+<span id="LC2621" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="sc" style="color: #d14;">'-'</span> <span class="n" style="color: #333;">fexp</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span></span>
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2514
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2622
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<pre style="margin: 0;"> <span id="LC2622" class="line" lang="haskell"> <span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">$</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;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span></span>
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2515
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2623
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<pre style="margin: 0;"> <span id="LC2623" class="line" lang="haskell"> <span class="n" style="color: #333;">amms</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsNegAppPV</span> <span class="p">(</span><span class="n" style="color: #333;">comb2</span> <span class="o" style="font-weight: 600;">$</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>
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2516
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2624
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<pre style="margin: 0;"> <span id="LC2624" 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;">AnnMinus</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">]</span> <span class="p">}</span></span>
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2517
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<pre style="margin: 0;">-<span id="LC2517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fexp</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2625
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<pre style="margin: 0;">+<span id="LC2625" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: exp10 -> fexp]</span></span>
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2626
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<pre style="margin: 0;">+<span id="LC2626" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">fexp</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2518
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2627
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<pre style="margin: 0;"> <span id="LC2627" class="line" lang="haskell"></span>
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2519
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2628
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<pre style="margin: 0;"> <span id="LC2628" class="line" lang="haskell"><span class="n" style="color: #333;">optSemi</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Token</span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="p">}</span></span>
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2629
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<pre style="margin: 0;"> <span id="LC2629" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="sc" style="color: #d14;">';'</span> <span class="p">{</span> <span class="p">([</span><span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">],</span><span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2799" 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">@@ -2690,7 +2799,8 @@ aexp1 :: { ECP }</td>
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2690
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2799
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<pre style="margin: 0;"> <span id="LC2799" class="line" lang="haskell"><span class="n" style="color: #333;">aexp2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="p">}</span></span>
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2691
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2800
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<pre style="margin: 0;"> <span id="LC2800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">qvar</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsVarPV</span> <span class="o" style="font-weight: 600;">$!</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2692
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2801
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<pre style="margin: 0;"> <span id="LC2801" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">qcon</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsVarPV</span> <span class="o" style="font-weight: 600;">$!</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2693
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<pre style="margin: 0;">-<span id="LC2693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ipvar</span> <span class="p">{</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIPVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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2802
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<pre style="margin: 0;">+<span id="LC2802" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: aexp2 -> ipvar]</span></span>
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2803
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<pre style="margin: 0;">+<span id="LC2803" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ipvar</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIPVar</span> <span class="n" style="color: #333;">noExtField</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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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="n" style="color: #333;">overloaded_label</span> <span class="p">{</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsOverLabel</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">$!</span> <span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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2695
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2805
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<pre style="margin: 0;"> <span id="LC2805" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">literal</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">ECP</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHsLitPV</span> <span class="o" style="font-weight: 600;">$!</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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2806
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<pre style="margin: 0;"> <span id="LC2806" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This will enable overloaded strings permanently. Normally the renamer turns HsString</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2732" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2842" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2732,7 +2842,8 @@ aexp2 :: { ECP }</td>
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2732
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2842
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<pre style="margin: 0;"> <span id="LC2842" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SIMPLEQUOTE</span> <span class="n" style="color: #333;">qcon</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ams</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;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsBracket</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarBr</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">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;">AnnSimpleQuote</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnName</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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2733
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2843
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<pre style="margin: 0;"> <span id="LC2843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TH_TY_QUOTE</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</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="kt" style="color: #458; font-weight: 600;">HsBracket</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarBr</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)))</span> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnThTyQuote</span> <span class="o" style="font-weight: 600;">$</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;">AnnName</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2844" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TH_TY_QUOTE</span> <span class="n" style="color: #333;">gtycon</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ams</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;">$</span> <span class="kt" style="color: #458; font-weight: 600;">HsBracket</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarBr</span> <span class="n" style="color: #333;">noExtField</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">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;">AnnThTyQuote</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnName</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">]</span> <span class="p">}</span></span>
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2735
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<pre style="margin: 0;">-<span id="LC2735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TH_TY_QUOTE</span> <span class="cm" style="color: #998; font-style: italic;">{- nothing -}</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">reportEmptyDoubleQuotes</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2845" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: aexp2 -> TH_TY_QUOTE]</span></span>
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2846
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<pre style="margin: 0;">+<span id="LC2846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TH_TY_QUOTE</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">reportEmptyDoubleQuotes</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">}</span></span>
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2736
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2847
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<pre style="margin: 0;"> <span id="LC2847" 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="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 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="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">runPV</span> <span class="p">(</span><span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span> <span class="o" style="font-weight: 600;">-></span></span>
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2737
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2848
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<pre style="margin: 0;"> <span id="LC2848" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">ecpFromExp</span> <span class="o" style="font-weight: 600;">$</span></span>
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2738
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2849
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<pre style="margin: 0;"> <span id="LC2849" class="line" lang="haskell"> <span class="n" style="color: #333;">ams</span> <span class="p">(</span><span class="n" style="color: #333;">sLL</span> <span class="o" style="font-weight: 600;">$</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="kt" style="color: #458; font-weight: 600;">HsBracket</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExpBr</span> <span class="n" style="color: #333;">noExtField</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2874" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2985" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2874,7 +2985,8 @@ tup_tail :: { forall b. DisambECP b => PV [Located (Maybe (Located b))] }</td>
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2874
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2985
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<pre style="margin: 0;"> <span id="LC2985" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="p">(</span><span class="n" style="color: #333;">gl</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="p">}</span></span>
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2875
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2986
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<pre style="margin: 0;"> <span id="LC2986" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">texp</span> <span class="p">{</span> <span class="n" style="color: #333;">unECP</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="o" style="font-weight: 600;">-></span></span>
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2876
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2987
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<pre style="margin: 0;"> <span id="LC2987" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="p">(</span><span class="n" style="color: #333;">gl</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span><span class="p">)]</span> <span class="p">}</span></span>
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2877
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<pre style="margin: 0;">-<span id="LC2877" 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="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">noLoc</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">]</span> <span class="p">}</span></span>
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2988
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<pre style="margin: 0;">+<span id="LC2988" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: tup_tail -> {- empty -}]</span></span>
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2989
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<pre style="margin: 0;">+<span id="LC2989" 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="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">noLoc</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">]</span> <span class="p">}</span></span>
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2878
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2990
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<pre style="margin: 0;"> <span id="LC2990" class="line" lang="haskell"></span>
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2879
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2991
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<pre style="margin: 0;"> <span id="LC2991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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2880
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2992
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<pre style="margin: 0;"> <span id="LC2992" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- List expressions</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3497" 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">@@ -3385,7 +3497,8 @@ child.</td>
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3497
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<pre style="margin: 0;"> <span id="LC3497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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3386
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3498
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<pre style="margin: 0;"> <span id="LC3498" class="line" lang="haskell"></span>
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3387
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3499
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<pre style="margin: 0;"> <span id="LC3499" class="line" lang="haskell"><span class="n" style="color: #333;">qtyconop</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;">RdrName</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Qualified or unqualified</span></span>
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3388
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<pre style="margin: 0;">-<span id="LC3388" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">qtyconsym</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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3500
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<pre style="margin: 0;">+<span id="LC3500" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: qtyconop -> qtyconsym]</span></span>
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3501
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<pre style="margin: 0;">+<span id="LC3501" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">qtyconsym</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">}</span></span>
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3389
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3502
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<pre style="margin: 0;"> <span id="LC3502" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'`'</span> <span class="n" style="color: #333;">qtycon</span> <span class="sc" style="color: #d14;">'`'</span> <span class="p">{</span><span class="o" style="font-weight: 600;">%</span> <span class="n" style="color: #333;">ams</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="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">2</span><span class="p">))</span></span>
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3390
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3503
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<pre style="margin: 0;"> <span id="LC3503" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnBackquote</span> <span class="o" style="font-weight: 600;">$</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;">$</span><span class="mi" style="color: #099;">2</span></span>
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3391
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3504
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<pre style="margin: 0;"> <span id="LC3504" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">mj</span> <span class="kt" style="color: #458; font-weight: 600;">AnnBackquote</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">3</span><span class="p">]</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3552,7 +3665,8 @@ special_id</td>
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3552
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3665
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<pre style="margin: 0;"> <span id="LC3665" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'c</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">a</span><span class="n" style="color: #333;">pi'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"capi"</span><span class="p">)</span> <span class="p">}</span></span>
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3553
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3666
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<pre style="margin: 0;"> <span id="LC3666" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'p</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">r</span><span class="n" style="color: #333;">im'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"prim"</span><span class="p">)</span> <span class="p">}</span></span>
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3554
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3667
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<pre style="margin: 0;"> <span id="LC3667" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'j</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">a</span><span class="n" style="color: #333;">vascript'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"javascript"</span><span class="p">)</span> <span class="p">}</span></span>
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3555
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<pre style="margin: 0;">-<span id="LC3555" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'g</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">r</span><span class="n" style="color: #333;">oup'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"group"</span><span class="p">)</span> <span class="p">}</span></span>
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3668
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<pre style="margin: 0;">+<span id="LC3668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [%shift: special_id -> 'group']</span></span>
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3669
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<pre style="margin: 0;">+<span id="LC3669" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'g</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">r</span><span class="n" style="color: #333;">oup'</span> <span class="o" style="font-weight: 600;">%</span><span class="n" style="color: #333;">shift</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"group"</span><span class="p">)</span> <span class="p">}</span></span>
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3556
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3670
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<pre style="margin: 0;"> <span id="LC3670" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'s</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">t</span><span class="n" style="color: #333;">ock'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"stock"</span><span class="p">)</span> <span class="p">}</span></span>
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3557
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3671
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<pre style="margin: 0;"> <span id="LC3671" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'a</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">n</span><span class="n" style="color: #333;">yclass'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"anyclass"</span><span class="p">)</span> <span class="p">}</span></span>
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3558
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3672
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<pre style="margin: 0;"> <span id="LC3672" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="sc" style="color: #d14;">'v</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">i</span><span class="n" style="color: #333;">a'</span> <span class="p">{</span> <span class="n" style="color: #333;">sL1</span> <span class="o" style="font-weight: 600;">$</span><span class="mi" style="color: #099;">1</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"via"</span><span class="p">)</span> <span class="p">}</span></span>
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