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<h3>
Richard Eisenberg pushed to branch wip/derived-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878">a7074a72</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-06-26T11:20:36+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Float fundep constraints
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<h4>8 changed files:</h4>
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<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<a href="#93bba9b9e0195db135fec54160523a427ea042fd">
compiler/GHC/Tc/Types/Origin.hs
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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<a href="#acb6aa122f203c66ea9e09f9de79000c17395024">
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+
testsuite/tests/typecheck/should_compile/FloatFDs.hs
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -548,8 +548,9 @@ instance Outputable ErrorItem where</td>
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548
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"></span>
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549
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_supp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">supp</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"suppress:"</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="cd">-- | Makes an error item based on the predicate-at-birth of the provided</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraint. This should be rewritten w.r.t. givens before reported.</span></span>
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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell"><span class="cd">-- | Makes an error item from a constraint, calculating whether or not</span></span>
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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the item should be suppressed. See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC554" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC556" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3168" 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="3169" 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">@@ -3168,9 +3169,12 @@ warnDefaulting :: [Ct] -> Type -> TcM ()</td>
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<pre style="margin: 0;"> <span id="LC3169" class="line" lang="haskell"><span class="n" style="color: #333;">warnDefaulting</span> <span class="n" style="color: #333;">wanteds</span> <span class="n" style="color: #333;">default_ty</span></span>
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3169
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<pre style="margin: 0;"> <span id="LC3170" class="line" lang="haskell"> <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;">warn_default</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">woptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnTypeDefaults</span></span>
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<pre style="margin: 0;"> <span id="LC3171" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">env0</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInitTidyEnv</span></span>
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<pre style="margin: 0;">-<span id="LC3171" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tidy_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyFreeTyCoVars</span> <span class="n" style="color: #333;">env0</span> <span class="o" style="font-weight: 600;">$</span></span>
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3172
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<pre style="margin: 0;">-<span id="LC3172" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfCtsList</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">wanteds</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3173" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_wanteds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">tidy_env</span><span class="p">)</span> <span class="n" style="color: #333;">wanteds</span></span>
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3172
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<pre style="margin: 0;">+<span id="LC3172" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't want to report all the superclass constraints, which</span></span>
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3173
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<pre style="margin: 0;">+<span id="LC3173" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- add unhelpful clutter</span></span>
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3174
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<pre style="margin: 0;">+<span id="LC3174" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">filtered</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">is_wanted_superclass</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctOrigin</span><span class="p">)</span> <span class="n" style="color: #333;">wanteds</span></span>
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3175
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<pre style="margin: 0;">+<span id="LC3175" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidyFreeTyCoVars</span> <span class="n" style="color: #333;">env0</span> <span class="o" style="font-weight: 600;">$</span></span>
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3176
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<pre style="margin: 0;">+<span id="LC3176" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfCtsList</span> <span class="p">(</span><span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">filtered</span><span class="p">)</span></span>
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3177
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<pre style="margin: 0;">+<span id="LC3177" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_wanteds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">tidy_env</span><span class="p">)</span> <span class="n" style="color: #333;">filtered</span></span>
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3174
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3178
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<pre style="margin: 0;"> <span id="LC3178" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">loc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr_wanteds</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprWithArising</span> <span class="n" style="color: #333;">tidy_wanteds</span></span>
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3175
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3179
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<pre style="margin: 0;"> <span id="LC3179" class="line" lang="haskell"> <span class="n" style="color: #333;">warn_msg</span> <span class="o" style="font-weight: 600;">=</span></span>
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3176
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3180
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<pre style="margin: 0;"> <span id="LC3180" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">hsep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Defaulting the following"</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">@@ -3180,6 +3184,9 @@ warnDefaulting wanteds default_ty</td>
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3180
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3184
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<pre style="margin: 0;"> <span id="LC3184" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span></span>
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3181
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3185
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<pre style="margin: 0;"> <span id="LC3185" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_wanteds</span></span>
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3182
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3186
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<pre style="margin: 0;"> <span id="LC3186" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setCtLocM</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">warnTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Reason</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnTypeDefaults</span><span class="p">)</span> <span class="n" style="color: #333;">warn_default</span> <span class="n" style="color: #333;">warn_msg</span> <span class="p">}</span></span>
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3187
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<pre style="margin: 0;">+<span id="LC3187" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3188
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<pre style="margin: 0;">+<span id="LC3188" class="line" lang="haskell"> <span class="n" style="color: #333;">is_wanted_superclass</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WantedSuperclassOrigin</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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3189
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<pre style="margin: 0;">+<span id="LC3189" class="line" lang="haskell"> <span class="n" style="color: #333;">is_wanted_superclass</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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3183
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3190
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<pre style="margin: 0;"> <span id="LC3190" class="line" lang="haskell"></span>
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3184
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3191
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<pre style="margin: 0;"> <span id="LC3191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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3185
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3192
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<pre style="margin: 0;"> <span id="LC3192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Runtime skolems]</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,7 +29,7 @@ module GHC.Tc.Solver(</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classKey</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classTyCon</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classKey</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classTyCon</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">classHasFds</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">idType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</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">@@ -1655,7 +1655,7 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">residual_wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wanteds</span></span>
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1656
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- solveWanteds, *not* solveWantedsAndDrop, because</span></span>
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1657
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<pre style="margin: 0;"> <span id="LC1657" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to retain derived equalities so we can float</span></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them out in float<span class="idiff left right">Equalitie</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC1658" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them out in float<span class="idiff left right">Constraint</span>s</span></span>
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1659
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<pre style="margin: 0;"> <span id="LC1659" class="line" lang="haskell"></span>
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1660
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<pre style="margin: 0;"> <span id="LC1660" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">no_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">given_insols</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getNoGivenEqs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">skols</span></span>
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1661
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<pre style="margin: 0;"> <span id="LC1661" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Call getNoGivenEqs /after/ solveWanteds, because</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">@@ -1665,8 +1665,8 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1665
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">no_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">given_insols</span><span class="p">,</span> <span class="n" style="color: #333;">residual_wanted</span><span class="p">)</span> <span class="p">}</span></span>
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1666
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1667" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floated_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">residual_wanted</span><span class="p">)</span></span>
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1668
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<pre style="margin: 0;">-<span id="LC1668" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">float<span class="idiff left right">Equalitie</span>s</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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1669
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"> <span class="n" style="color: #333;">no_given_eqs</span> <span class="n" style="color: #333;">residual_wanted</span></span>
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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">float<span class="idiff left right">Constraint</span>s</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">no_given_eqs</span> <span class="n" style="color: #333;">residual_wanted</span></span>
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveImplication 2"</span></span>
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<pre style="margin: 0;"> <span id="LC1672" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given_insols</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">residual_wanted</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">@@ -2288,10 +2288,10 @@ beta! Concrete example is in indexed_types/should_fail/ExtraTcsUntch.hs:</td>
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<pre style="margin: 0;"> <span id="LC2288" 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="LC2289" 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="LC2290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Float <span class="idiff left right">Equalities out of I</span>mplications]</span></span>
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<pre style="margin: 0;">-<span id="LC2292" 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="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Float <span class="idiff left right">constraints out of i</span>mplications]</span></span>
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<pre style="margin: 0;">+<span id="LC2292" 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="LC2293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For ordinary pattern matches (including existentials) we float</span></span>
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<pre style="margin: 0;">-<span id="LC2294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">equalitie</span>s out of implications, for instance:</span></span>
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">constraint</span>s out of implications, for instance:</span></span>
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<pre style="margin: 0;"> <span id="LC2295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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<pre style="margin: 0;"> <span id="LC2296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: Eq a => a -> T</span></span>
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<pre style="margin: 0;"> <span id="LC2297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y = case x of MkT _ -> (y::Int)</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">@@ -2300,7 +2300,7 @@ We get the implication constraint (x::T) (y::alpha):</td>
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<pre style="margin: 0;"> <span id="LC2300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to float out the equality into a scope where alpha is no</span></span>
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<pre style="margin: 0;"> <span id="LC2301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">longer untouchable, to solve the implication!</span></span>
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<pre style="margin: 0;"> <span id="LC2302" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we cannot float <span class="idiff left right">equalitie</span>s out of implications whose givens may</span></span>
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we cannot float <span class="idiff left right">constraint</span>s out of implications whose givens may</span></span>
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<pre style="margin: 0;"> <span id="LC2304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">yield or contain equalities:</span></span>
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2305
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</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">@@ -2326,7 +2326,7 @@ But if we just leave them inside the implications, we unify alpha := beta and</td>
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2326
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<pre style="margin: 0;"> <span id="LC2326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solve everything.</span></span>
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2327
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<pre style="margin: 0;"> <span id="LC2327" class="line" lang="haskell"></span>
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2328
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<pre style="margin: 0;"> <span id="LC2328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Principle:</span></span>
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2329
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<pre style="margin: 0;">-<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We do not want to float <span class="idiff left right">equalitie</span>s out which may</span></span>
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<pre style="margin: 0;">+<span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We do not want to float <span class="idiff left right">constraint</span>s out which may</span></span>
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2330
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<pre style="margin: 0;"> <span id="LC2330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> need the given *evidence* to become soluble.</span></span>
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2331
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<pre style="margin: 0;"> <span id="LC2331" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequence: classes with functional dependencies don't matter (since there is</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">@@ -2334,10 +2334,10 @@ no evidence for a fundep equality), but equality superclasses do matter (since</td>
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<pre style="margin: 0;"> <span id="LC2334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they carry evidence).</span></span>
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<pre style="margin: 0;"> <span id="LC2335" 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="LC2336" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2337" class="line" lang="haskell"><span class="n" style="color: #333;">float<span class="idiff left right">Equalitie</span>s</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvId</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvBindsVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2338
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<pre style="margin: 0;">-<span id="LC2338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC2339" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2340" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Main idea: see Note [Float <span class="idiff left right">Equalities out of I</span>mplications]</span></span>
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<pre style="margin: 0;">+<span id="LC2337" class="line" lang="haskell"><span class="n" style="color: #333;">float<span class="idiff left right">Constraint</span>s</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvId</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvBindsVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2338" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">+<span id="LC2339" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2340" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Main idea: see Note [Float <span class="idiff left right">constraints out of i</span>mplications]</span></span>
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<pre style="margin: 0;"> <span id="LC2341" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC2342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: the wc_simple of the incoming WantedConstraints are</span></span>
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<pre style="margin: 0;"> <span id="LC2343" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- fully zonked, so that we can see their free variables</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">@@ -2352,10 +2352,10 @@ floatEqualities :: [TcTyVar] -> [EvId] -> EvBindsVar -> Bool</td>
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<pre style="margin: 0;"> <span id="LC2352" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Subtleties: Note [Float equalities from under a skolem binding]</span></span>
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<pre style="margin: 0;"> <span id="LC2353" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Skolem escape]</span></span>
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<pre style="margin: 0;"> <span id="LC2354" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [What prevents a constraint from floating]</span></span>
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<pre style="margin: 0;">-<span id="LC2355" class="line" lang="haskell"><span class="n" style="color: #333;">float<span class="idiff left right">Equalitie</span>s</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="n" style="color: #333;">no_given_eqs</span></span>
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"> <span class="n" style="color: #333;">wanteds</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC2355" class="line" lang="haskell"><span class="n" style="color: #333;">float<span class="idiff left right">Constraint</span>s</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="n" style="color: #333;">no_given_eqs</span></span>
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<pre style="margin: 0;">+<span id="LC2356" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">wanteds</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2357" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_given_eqs</span> <span class="c1" style="color: #998; font-style: italic;">-- There are some given equalities, so don't float</span></span>
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2358
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<pre style="margin: 0;">-<span id="LC2358" 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;">emptyBag</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Float <span class="idiff left right">Equalities out of I</span>mplications]</span></span>
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<pre style="margin: 0;">+<span id="LC2358" 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;">emptyBag</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Float <span class="idiff left right">constraints out of i</span>mplications]</span></span>
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<pre style="margin: 0;"> <span id="LC2359" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC2361" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- First zonk: the inert set (from whence they came) is fully</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">@@ -2367,7 +2367,7 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2368" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now we can pick the ones to float</span></span>
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<pre style="margin: 0;"> <span id="LC2369" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The constraints are un-flattened and de-canonicalised</span></span>
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<pre style="margin: 0;">-<span id="LC2370" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">candidate<span class="idiff left">_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">no_float_cts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">partitionBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">is_float_eq</span>_candidate</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">+<span id="LC2370" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">candidate<span class="idiff left">s</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">no_float_cts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">partitionBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">is_float</span>_candidate</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;"> <span id="LC2371" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2372" class="line" lang="haskell"> <span class="n" style="color: #333;">seed_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">skols</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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<pre style="margin: 0;"> <span id="LC2373" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">given_ids</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</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">@@ -2376,25 +2376,25 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>
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<pre style="margin: 0;"> <span id="LC2376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- seed_skols: See Note [What prevents a constraint from floating] (1,2,3)</span></span>
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<pre style="margin: 0;"> <span id="LC2377" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Include the EvIds of any non-floating constraints</span></span>
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<pre style="margin: 0;"> <span id="LC2378" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2379" class="line" lang="haskell"> <span class="n" style="color: #333;">extended_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transCloVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">add_captured_ev_ids</span> <span class="n" style="color: #333;">candidate<span class="idiff left right">_eq</span>s</span><span class="p">)</span> <span class="n" style="color: #333;">seed_skols</span></span>
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<pre style="margin: 0;">+<span id="LC2379" class="line" lang="haskell"> <span class="n" style="color: #333;">extended_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transCloVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">add_captured_ev_ids</span> <span class="n" style="color: #333;">candidates</span><span class="p">)</span> <span class="n" style="color: #333;">seed_skols</span></span>
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<pre style="margin: 0;"> <span id="LC2380" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- extended_skols contains the EvIds of all the trapped constraints</span></span>
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<pre style="margin: 0;"> <span id="LC2381" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [What prevents a constraint from floating] (3)</span></span>
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2383" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">flt<span class="idiff left">_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">no_flt_eq</span>s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBag</span> <span class="p">(</span><span class="n" style="color: #333;">is_floatable</span> <span class="n" style="color: #333;">extended_skols</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2384" class="line" lang="haskell"> <span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">candidate_eq</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2383" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">flt<span class="idiff left">s</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">no_flt</span>s</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBag</span> <span class="p">(</span><span class="n" style="color: #333;">is_floatable</span> <span class="n" style="color: #333;">extended_skols</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2384" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left right">candidate</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC2385" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2386" class="line" lang="haskell"> <span class="n" style="color: #333;">remaining_simples</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no_float_cts</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">no_flt<span class="idiff left right">_eq</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2386" class="line" lang="haskell"> <span class="n" style="color: #333;">remaining_simples</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no_float_cts</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">no_flts</span></span>
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Promote any unification variables mentioned in the floated equalities</span></span>
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<pre style="margin: 0;"> <span id="LC2389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting unification variables]</span></span>
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<pre style="margin: 0;">-<span id="LC2390" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">promoteTyVarTcS</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCtsList</span> <span class="n" style="color: #333;">flt<span class="idiff left right">_eq</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2390" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">promoteTyVarTcS</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCtsList</span> <span class="n" style="color: #333;">flts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2391" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2392" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"float<span class="idiff left right">Equalitie</span>s"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">skols</span></span>
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<pre style="margin: 0;">-<span id="LC2393" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Extended skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">extended_skols</span></span>
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<pre style="margin: 0;">-<span id="LC2394" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC2395" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"Candidate eqs ="</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">candidate_eq</span>s</span></span>
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<pre style="margin: 0;">-<span id="LC2396" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"Floated eqs ="</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">flt_eqs</span></span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC2397" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">flt<span class="idiff left right">_eq</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">remaining_simples</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2392" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"float<span class="idiff left right">Constraint</span>s"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">skols</span></span>
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<pre style="margin: 0;">+<span id="LC2393" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Extended skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">extended_skols</span></span>
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<pre style="margin: 0;">+<span id="LC2394" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">+<span id="LC2395" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"Candidate cts ="</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">candidate</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2396" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"Floated cts ="</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">flts</span></span><span class="idiff right"> </span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC2397" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">flts</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">remaining_simples</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2398" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2399" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2400" class="line" lang="haskell"> <span class="n" style="color: #333;">add_one_bind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</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">@@ -2417,25 +2417,26 @@ floatEqualities skols given_ids ev_binds_var no_given_eqs</td>
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<pre style="margin: 0;"> <span id="LC2417" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarSet</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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2418
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<pre style="margin: 0;"> <span id="LC2418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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2419
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<pre style="margin: 0;"> <span id="LC2419" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Identify which <span class="idiff left right">equalitie</span>s are candidates for floating</span></span>
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<pre style="margin: 0;">+<span id="LC2420" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Identify which <span class="idiff left right">constraint</span>s are candidates for floating</span></span>
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<pre style="margin: 0;"> <span id="LC2421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Float out alpha ~ ty, or ty ~ alpha which might be unified outside</span></span>
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2422
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<pre style="margin: 0;">-<span id="LC2422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">See Note [Which equalities to float]</span></span></span>
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<pre style="margin: 0;">-<span id="LC2423" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">is_float_eq_candidate</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span></span>
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<pre style="margin: 0;">-<span id="LC2424" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pred</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ct</span></span></span>
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<pre style="margin: 0;">-<span id="LC2425" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EqPred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NomEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">classifyPredType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pred</span></span></span>
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<pre style="margin: 0;">-<span id="LC2426" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left right">=</span></span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC2422" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Also float out class constraints with functional dependencies</span></span></span>
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<pre style="margin: 0;">+<span id="LC2423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- See Note [Which constraints to float]</span></span></span>
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<pre style="margin: 0;">+<span id="LC2424" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">is_float_candidate</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">classifyPredType</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">of</span></span></span>
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<pre style="margin: 0;">+<span id="LC2425" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">EqPred</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NomEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span></span>
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<pre style="margin: 0;">+<span id="LC2426" class="line" lang="haskell"> <span class="idiff left right"> </span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC2427" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv1</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">float_tv_eq_candidate</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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2428
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<pre style="margin: 0;"> <span id="LC2428" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">float_tv_eq_candidate</span> <span class="n" style="color: #333;">tv2</span> <span class="n" style="color: #333;">ty1</span></span>
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2429
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2429
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<pre style="margin: 0;"> <span id="LC2429" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2430
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<pre style="margin: 0;">-<span id="LC2430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2430
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">classHasFds</span> <span class="n" style="color: #333;">cls</span></span>
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2431
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<pre style="margin: 0;">+<span id="LC2431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2431
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2432
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<pre style="margin: 0;"> <span id="LC2432" class="line" lang="haskell"></span>
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2432
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<pre style="margin: 0;">-<span id="LC2432" class="line" lang="haskell"> <span class="n" style="color: #333;">float_tv_eq_candidate</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Which <span class="idiff left right">equalitie</span>s to float]</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" class="line" lang="haskell"> <span class="n" style="color: #333;">float_tv_eq_candidate</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Which <span class="idiff left right">constraint</span>s to float]</span></span>
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2433
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2434
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv1</span></span>
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2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVarTyVar</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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2436
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"></span>
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2437
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<pre style="margin: 0;"> <span id="LC2437" class="line" lang="haskell"></span>
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2438
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Float equalities from under a skolem binding]</span></span>
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<pre style="margin: 0;">-<span id="LC2438" 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="LC2439" 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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2440
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<pre style="margin: 0;"> <span id="LC2440" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which of the simple equalities can we float out? Obviously, only</span></span>
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2441
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<pre style="margin: 0;"> <span id="LC2441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones that don't mention the skolem-bound variables. But that is</span></span>
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2442
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<pre style="margin: 0;"> <span id="LC2442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">over-eager. Consider</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">@@ -2457,11 +2458,13 @@ We had a very complicated rule previously, but this is nice and</td>
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2458
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<pre style="margin: 0;"> <span id="LC2458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simple. (To see the notes, look at this Note in a version of</span></span>
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2459
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<pre style="margin: 0;"> <span id="LC2459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Solver prior to Oct 2014).</span></span>
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2460
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<pre style="margin: 0;"> <span id="LC2460" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2460" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Which <span class="idiff left right">equalitie</span>s to float]</span></span>
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<pre style="margin: 0;">-<span id="LC2461" 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="LC2462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which <span class="idiff left right">equalitie</span>s should we float? We want to float ones where there</span></span>
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<pre style="margin: 0;">+<span id="LC2461" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Which <span class="idiff left right">constraint</span>s to float]</span></span>
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<pre style="margin: 0;">+<span id="LC2462" 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="LC2463" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which <span class="idiff left right">constraint</span>s should we float? We want to float ones where there</span></span>
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2464
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<pre style="margin: 0;"> <span id="LC2464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is a decent chance that floating outwards will allow unification to</span></span>
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<pre style="margin: 0;">-<span id="LC2464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happen. In particular, float out equalities that are:</span></span>
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<pre style="margin: 0;">+<span id="LC2465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happen.</span></span>
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2466
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<pre style="margin: 0;">+<span id="LC2466" class="line" lang="haskell"></span>
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2467
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<pre style="margin: 0;">+<span id="LC2467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Float out equalities that are:</span></span>
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2468
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<pre style="margin: 0;"> <span id="LC2468" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Of form (alpha ~# ty) or (ty ~# alpha), where</span></span>
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<pre style="margin: 0;"> <span id="LC2470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * alpha is a meta-tyvar.</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">@@ -2473,6 +2476,18 @@ happen. In particular, float out equalities that are:</td>
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<pre style="margin: 0;"> <span id="LC2476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unify representational equalities even if alpha is touchable.</span></span>
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<pre style="margin: 0;"> <span id="LC2477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Do not unify representational equalities] in GHC.Tc.Solver.Interact.</span></span>
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<pre style="margin: 0;"> <span id="LC2478" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Float out class constraints with functional dependencies. Example:</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b | a -> b</span></span>
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<pre style="margin: 0;">+<span id="LC2482" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall [1]. C a[sk] beta1[tau]</span></span>
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall [1]. C a[sk] beta2[tau]</span></span>
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<pre style="margin: 0;">+<span id="LC2485" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want the two class constraints to interact, so that we can unify beta1 := beta2.</span></span>
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<pre style="margin: 0;">+<span id="LC2487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But since they are in separate implications, they won't find each other. Thus: float.</span></span>
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<pre style="margin: 0;">+<span id="LC2488" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is tested in test case typecheck/should_compile/FloatFDs.</span></span>
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<pre style="margin: 0;">+<span id="LC2490" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Skolem escape]</span></span>
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<pre style="margin: 0;"> <span id="LC2492" 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="LC2493" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might worry about skolem escape with all this floating.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -595,7 +595,7 @@ mk_strict_superclasses rec_clss ev tvs theta cls tys</td>
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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">theta</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell"> <span class="n" style="color: #333;">concatMapM</span> <span class="n" style="color: #333;">do_one_derived</span> <span class="p">(</span><span class="n" style="color: #333;">immSuperClasses</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC597" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="idiff left"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">updateCtLocOrigin</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">WantedSuperclassOrigin</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_derived</span> <span class="n" style="color: #333;">sc_pred</span></span>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"> <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;">sc_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvRewriters</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="n" style="color: #333;">sc_pred</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1300,7 +1300,7 @@ untouchables, and therefore cannot be unified with anything at all,</td>
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<pre style="margin: 0;"> <span id="LC1300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">let alone the skolems.</span></span>
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1301
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<pre style="margin: 0;"> <span id="LC1301" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, ic_skols is used only when considering floating a constraint</span></span>
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<pre style="margin: 0;">-<span id="LC1303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">outside the implication in GHC.Tc.Solver.float<span class="idiff left right">Equalitie</span>s or</span></span>
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<pre style="margin: 0;">+<span id="LC1303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">outside the implication in GHC.Tc.Solver.float<span class="idiff left right">Constraint</span>s or</span></span>
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<pre style="margin: 0;"> <span id="LC1304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Solver.approximateImplications</span></span>
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<pre style="margin: 0;"> <span id="LC1305" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Insoluble constraints]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#93bba9b9e0195db135fec54160523a427ea042fd"><strong>compiler/GHC/Tc/Types/Origin.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -441,6 +441,11 @@ data CtOrigin</td>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InstProvidedOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Module</span> <span class="kt" style="color: #458; font-weight: 600;">ClsInst</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Skolem variable arose when we were testing if an instance</span></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is solvable or not.</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WantedSuperclassOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- From expanding out the superclasses of a Wanted; the PredType</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is the subclass predicate, and the origin</span></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the original Wanted is the CtOrigin</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An origin is visible if the place where the constraint arises is manifest</span></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in user code. Currently, all origins are visible except for invisible</span></span>
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TypeEqOrigins. This is used when choosing which error of</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">@@ -540,7 +545,6 @@ lGRHSCtOrigin _ = Shouldn'tHappenOrigin "multi-way GRHS"</td>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtOrigin</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "arising from ..."</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Not an instance of Outputable because of the "arising from" prefix</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GivenOrigin</span> <span class="n" style="color: #333;">sk</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctoHerald</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sk</span></span>
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<pre style="margin: 0;"> <span id="LC549" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SpecPragOrigin</span> <span class="n" style="color: #333;">ctxt</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">@@ -615,6 +619,10 @@ pprCtOrigin (InstProvidedOrigin mod cls_inst)</td>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cls_inst</span></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"is provided by"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mod</span><span class="p">)]</span></span>
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621
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WantedSuperclassOrigin</span> <span class="n" style="color: #333;">subclass_pred</span> <span class="n" style="color: #333;">subclass_orig</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">ctoHerald</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"a superclass required to satisfy"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">subclass_pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprCtOrigin</span> <span class="n" style="color: #333;">subclass_orig</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"><span class="n" style="color: #333;">pprCtOrigin</span> <span class="n" style="color: #333;">simple_origin</span></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctoHerald</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprCtO</span> <span class="n" style="color: #333;">simple_origin</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1756,7 +1756,7 @@ So we look for a positive reason to swap, using a three-step test:</td>
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Generally speaking we always try to put a MetaTv on the left</span></span>
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<pre style="margin: 0;"> <span id="LC1757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in preference to SkolemTv or RuntimeUnkTv:</span></span>
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1758
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<pre style="margin: 0;"> <span id="LC1758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) Because the MetaTv may be touchable and can be unified</span></span>
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1759
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<pre style="margin: 0;">-<span id="LC1759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) Even if it's not touchable, GHC.Tc.Solver.float<span class="idiff left right">Equalitie</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC1759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) Even if it's not touchable, GHC.Tc.Solver.float<span class="idiff left right">Constraint</span>s</span></span>
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1760
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<pre style="margin: 0;"> <span id="LC1760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> looks for meta tyvars on the left</span></span>
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1761
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1761
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<pre style="margin: 0;"> <span id="LC1761" class="line" lang="haskell"></span>
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1762
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<pre style="margin: 0;"> <span id="LC1762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Tie-breaking rules for MetaTvs:</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#acb6aa122f203c66ea9e09f9de79000c17395024"><strong>testsuite/tests/typecheck/should_compile/FloatFDs.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveDataTypeable #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE Safe #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cd">-- |</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module : Text.Parsec.Expr</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Copyright : (c) Daan Leijen 1999-2001, (c) Paolo Martini 2007</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- License : BSD-style (see the LICENSE file)</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Maintainer : derek.a.elkins@gmail.com</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stability : provisional</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Portability : non-portable</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A helper module to parse \"expressions\".</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Builds a parser given a table of operators and associativities.</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Text.Parsec.Expr</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">Operator</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">OperatorTable</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">buildExpressionParser</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Typeable</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Typeable</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Text.Parsec.Prim</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Text.Parsec.Combinator</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Assoc and OperatorTable</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="cd">-- | This data type specifies the associativity of operators: left, right</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- or none.</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">AssocNone</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocLeft</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocRight</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Typeable</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="cd">-- | This data type specifies operators that work on values of type @a@.</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An operator is either binary infix or unary prefix or postfix. A</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- binary operator has also an associated associativity.</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Operator</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Infix</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParsecT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="kt" style="color: #458; font-weight: 600;">Assoc</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Prefix</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParsecT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Postfix</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParsecT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="kt" style="color: #458; font-weight: 600;">MIN_VERSION_base</span><span class="p">(</span><span class="mi" style="color: #099;">4</span><span class="p">,</span><span class="mi" style="color: #099;">7</span><span class="p">,</span><span class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Typeable</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="cd">-- | An @OperatorTable s u m a@ is a list of @Operator s u m a@</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- lists. The list is ordered in descending</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- precedence. All operators in one list have the same precedence (but</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- may have a different associativity).</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">OperatorTable</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[[</span><span class="kt" style="color: #458; font-weight: 600;">Operator</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span><span class="p">]]</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Convert an OperatorTable and basic term parser into</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a full fledged expression parser</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="cd">-- | @buildExpressionParser table term@ builds an expression parser for</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- terms @term@ with operators from @table@, taking the associativity</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and precedence specified in @table@ into account. Prefix and postfix</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- operators of the same precedence can only occur once (i.e. @--2@ is</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not allowed if @-@ is prefix negate). Prefix and postfix operators</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of the same precedence associate to the left (i.e. if @++@ is</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- postfix increment, than @-2++@ equals @-1@, not @-3@).</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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73
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The @buildExpressionParser@ takes care of all the complexity</span></span>
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74
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- involved in building expression parser. Here is an example of an</span></span>
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75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expression parser that handles prefix signs, postfix increment and</span></span>
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76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- basic arithmetic.</span></span>
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77
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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78
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > expr = buildExpressionParser table term</span></span>
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79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > <?> "expression"</span></span>
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80
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ></span></span>
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81
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > term = parens expr</span></span>
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82
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > <|> natural</span></span>
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83
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > <?> "simple expression"</span></span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ></span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > table = [ [prefix "-" negate, prefix "+" id ]</span></span>
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86
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > , [postfix "++" (+1)]</span></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > , [binary "*" (*) AssocLeft, binary "/" (div) AssocLeft ]</span></span>
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88
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > , [binary "+" (+) AssocLeft, binary "-" (-) AssocLeft ]</span></span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > ]</span></span>
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90
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ></span></span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > binary name fun assoc = Infix (do{ reservedOp name; return fun }) assoc</span></span>
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92
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > prefix name fun = Prefix (do{ reservedOp name; return fun })</span></span>
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93
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > postfix name fun = Postfix (do{ reservedOp name; return fun })</span></span>
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94
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="n" style="color: #333;">buildExpressionParser</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stream</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">OperatorTable</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ParsecT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</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="kt" style="color: #458; font-weight: 600;">ParsecT</span> <span class="n" style="color: #333;">s</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE buildExpressionParser #-}</span></span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="n" style="color: #333;">buildExpressionParser</span> <span class="n" style="color: #333;">operators</span> <span class="n" style="color: #333;">simpleExpr</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl</span> <span class="p">(</span><span class="n" style="color: #333;">makeParser</span><span class="p">)</span> <span class="n" style="color: #333;">simpleExpr</span> <span class="n" style="color: #333;">operators</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- makeParser :: Stream s m t => ParsecT s u m a -> [Operator s u m a] -> ParsecT s u m a</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- uncommenting this avoids the original problem, but we want to compile even</span></span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- without offering this hint</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">makeParser</span> <span class="n" style="color: #333;">term</span> <span class="n" style="color: #333;">ops</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span></span>
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108
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">splitOp</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;">[]</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;">[]</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="n" style="color: #333;">ops</span></span>
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109
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="n" style="color: #333;">rassocOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">choice</span> <span class="n" style="color: #333;">rassoc</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"> <span class="n" style="color: #333;">lassocOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">choice</span> <span class="n" style="color: #333;">lassoc</span></span>
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112
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="n" style="color: #333;">nassocOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">choice</span> <span class="n" style="color: #333;">nassoc</span></span>
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113
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="n" style="color: #333;">prefixOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">choice</span> <span class="n" style="color: #333;">prefix</span> <span class="o" style="font-weight: 600;"><?></span> <span class="s" style="color: #d14;">""</span></span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="n" style="color: #333;">postfixOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">choice</span> <span class="n" style="color: #333;">postfix</span> <span class="o" style="font-weight: 600;"><?></span> <span class="s" style="color: #d14;">""</span></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"> <span class="n" style="color: #333;">ambiguous</span> <span class="n" style="color: #333;">assoc</span> <span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">try</span> <span class="o" style="font-weight: 600;">$</span></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span><span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">op</span><span class="p">;</span> <span class="n" style="color: #333;">fail</span> <span class="p">(</span><span class="s" style="color: #d14;">"ambiguous use of a "</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">assoc</span></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="s" style="color: #d14;">" associative operator"</span><span class="p">)</span></span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"> <span class="p">}</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="n" style="color: #333;">ambiguousRight</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ambiguous</span> <span class="s" style="color: #d14;">"right"</span> <span class="n" style="color: #333;">rassocOp</span></span>
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122
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">ambiguousLeft</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ambiguous</span> <span class="s" style="color: #d14;">"left"</span> <span class="n" style="color: #333;">lassocOp</span></span>
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123
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">ambiguousNon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ambiguous</span> <span class="s" style="color: #d14;">"non"</span> <span class="n" style="color: #333;">nassocOp</span></span>
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124
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"></span>
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125
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="n" style="color: #333;">termP</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;">pre</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">prefixP</span></span>
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126
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">term</span></span>
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127
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">post</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">postfixP</span></span>
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128
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">post</span> <span class="p">(</span><span class="n" style="color: #333;">pre</span> <span class="n" style="color: #333;">x</span><span class="p">))</span></span>
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129
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"> <span class="p">}</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"> <span class="n" style="color: #333;">postfixP</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">postfixOp</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">id</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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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"> <span class="n" style="color: #333;">prefixP</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">prefixOp</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">id</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"> <span class="n" style="color: #333;">rassocP</span> <span class="n" style="color: #333;">x</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;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rassocOp</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">y</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;">z</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">termP</span><span class="p">;</span> <span class="n" style="color: #333;">rassocP1</span> <span class="n" style="color: #333;">z</span> <span class="p">}</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"> <span class="p">}</span></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousLeft</span></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousNon</span></span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <|> return x</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"></span>
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143
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"> <span class="n" style="color: #333;">rassocP1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rassocP</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">x</span></span>
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144
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"></span>
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145
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"> <span class="n" style="color: #333;">lassocP</span> <span class="n" style="color: #333;">x</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;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lassocOp</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">termP</span></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lassocP1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="p">}</span></span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousRight</span></span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousNon</span></span>
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151
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <|> return x</span></span>
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152
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"></span>
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153
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="n" style="color: #333;">lassocP1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lassocP</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">x</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="n" style="color: #333;">nassocP</span> <span class="n" style="color: #333;">x</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;">f</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">nassocOp</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">termP</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ambiguousRight</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousLeft</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">ambiguousNon</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" 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;">f</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"> <span class="p">}</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <|> return x</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">do</span><span class="p">{</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">termP</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rassocP</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">lassocP</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">nassocP</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">x</span></span>
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166
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><?></span> <span class="s" style="color: #d14;">"operator"</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"> <span class="p">}</span></span>
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168
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"></span>
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169
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="n" style="color: #333;">splitOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Infix</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">assoc</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="171" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">assoc</span> <span class="kr" style="font-weight: 600;">of</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocNone</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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173
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocLeft</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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174
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocRight</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"></span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"> <span class="n" style="color: #333;">splitOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Prefix</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</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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<td class="diff-line-num new new_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"> <span class="n" style="color: #333;">splitOp</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Postfix</span> <span class="n" style="color: #333;">op</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rassoc</span><span class="p">,</span><span class="n" style="color: #333;">lassoc</span><span class="p">,</span><span class="n" style="color: #333;">nassoc</span><span class="p">,</span><span class="n" style="color: #333;">prefix</span><span class="p">,</span><span class="n" style="color: #333;">op</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">postfix</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a7074a72e6bcad81bd8822749e6967098c54e878#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -703,3 +703,4 @@ test('T18023', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FunDepOrigin1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FloatFDs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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