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<h3>
Simon Peyton Jones pushed to branch wip/T18223
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/71342296e7d426786bee4466249802cd630ec292">71342296</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-08-24T10:04:03+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
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<h4>3 changed files:</h4>
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
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<a href="#a8e2a1e5829eb3b4809201e0f47e91b64ce11b96">
compiler/GHC/Core/Ppr.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71342296e7d426786bee4466249802cd630ec292#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="299" 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">@@ -299,8 +299,8 @@ tidyCoAxBndrsForUser init_env tcvs</td>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Convert a coercion to a MCoercion,</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checking aggressively for reflexivity</span></span>
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<pre style="margin: 0;">-<span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isRefl<span class="idiff left right">exive</span>Co</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="n" style="color: #333;">coToMCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MRefl</span></span>
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<pre style="margin: 0;">+<span id="LC303" 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;">MCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC305" class="line" lang="haskell"><span class="cd">-- | Tests if this MCoercion is obviously generalized reflexive</span></span>
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<pre style="margin: 0;"> <span id="LC306" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Guaranteed to work very quickly.</span></span>
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<li id="c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71342296e7d426786bee4466249802cd630ec292#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999"><strong>compiler/GHC/Core/Opt/Arity.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">@@ -1108,7 +1108,7 @@ eta_expand one_shots orig_expr</td>
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<pre style="margin: 0;"> <span id="LC1108" 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="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The EtaInfo mechanism</span></span>
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<pre style="margin: 0;"> <span id="LC1110" 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="LC1111" 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="LC1111" 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="LC1112" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The EtaInfo mechanism]</span></span>
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<pre style="margin: 0;"> <span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71342296e7d426786bee4466249802cd630ec292#a8e2a1e5829eb3b4809201e0f47e91b64ce11b96"><strong>compiler/GHC/Core/Ppr.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">@@ -166,7 +166,9 @@ ppr_id_occ add_par id</td>
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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="n" style="color: #333;">isJoinId</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_par</span> <span class="p">((</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"jump"</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_id</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC167" 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;">pp_id</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPrefixOcc</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">id</span> <span class="c1" style="color: #998; font-style: italic;">-- We could use pprPrefixOcc to print (+) etc, but this is</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Core where we don't print things infix anyway, so doing</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so just adds extra redundant parens</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_expr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OutputableBndr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Expr</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The function adds parens in context that need</span></span>
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