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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee">15ce1804</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-07-22T20:20:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deprecate -fdmd-tx-dict-sel.
It's behaviour is now unconditionally enabled as
it's slightly beneficial.
There are almost no benchmarks which benefit from
disabling it, so it's not worth the keep this
configurable.
This fixes #18429.
</pre>
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<li class="file-stats">
<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
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<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<li class="file-stats">
<a href="#2e45f2cd303dd998950a7c8042e796a5b2abd64f">
docs/users_guide/using-optimisation.rst
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<h4>Changes:</h4>
<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/DmdAnal.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="486" 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">@@ -486,8 +486,9 @@ dmdTransform env var dmd</td>
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486
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486
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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDataConWorkId</span> <span class="n" style="color: #333;">var</span></span>
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487
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487
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<pre style="margin: 0;"> <span id="LC487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformDataConSig</span> <span class="p">(</span><span class="n" style="color: #333;">idArity</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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488
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488
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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Dictionary component selectors</span></span>
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489
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<pre style="margin: 0;">-<span id="LC489" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span> <span class="p">(</span><span class="n" style="color: #333;">ae_dflags</span> <span class="n" style="color: #333;">env</span><span class="p">),</span></span>
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490
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<td class="diff-line-num new_line old" data-linenumber="489" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC490" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isClassOpId_maybe</span> <span class="n" style="color: #333;">var</span></span>
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<td class="diff-line-num new old_line" data-linenumber="491" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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489
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Used to be controlled by a flag.</span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #18429 for some perf measurements.</span></span>
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isClassOpId_maybe</span> <span class="n" style="color: #333;">var</span></span>
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491
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dmdTransformDictSelSig</span> <span class="p">(</span><span class="n" style="color: #333;">idStrictness</span> <span class="n" style="color: #333;">var</span><span class="p">)</span> <span class="n" style="color: #333;">dmd</span></span>
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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Imported functions</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGlobalId</span> <span class="n" style="color: #333;">var</span></span>
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<li id="2e5692f568fd7b67a6b172e2a60469da8392508c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee#2e5692f568fd7b67a6b172e2a60469da8392508c"><strong>compiler/GHC/Driver/Flags.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="188" 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="188" 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">@@ -188,7 +188,8 @@ data GeneralFlag</td>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_OmitYields</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_FunToThunk</span> <span class="c1" style="color: #998; font-style: italic;">-- allow GHC.Core.Opt.WorkWrap.Utils.mkWorkerArgs to remove all value lambdas</span></span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DictsStrict</span> <span class="c1" style="color: #998; font-style: italic;">-- be strict in argument dictionaries</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span> <span class="c1" style="color: #998; font-style: italic;">-- use a special demand transformer for dictionary selectors</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ deprecated, no effect and behaviour is now default.</span></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Allowed switching of a special demand transformer for dictionary selectors</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_Loopification</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Self-recursive tail calls]</span></span>
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193
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194
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_CfgBlocklayout</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Use the cfg based block layout algorithm.</span></span>
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194
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195
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WeightlessBlocklayout</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Layout based on last instruction per block.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ce1804d2b87ac7bd55632957a4cb897decbbee#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.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">@@ -3472,7 +3472,8 @@ fFlagsDeps = [</td>
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3472
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<pre style="margin: 0;"> <span id="LC3472" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"diagnostics-show-caret"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DiagnosticsShowCaret</span><span class="p">,</span></span>
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3473
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3473
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<pre style="margin: 0;"> <span id="LC3473" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"dicts-cheap"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DictsCheap</span><span class="p">,</span></span>
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3474
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3474
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<pre style="margin: 0;"> <span id="LC3474" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"dicts-strict"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DictsStrict</span><span class="p">,</span></span>
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3475
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<pre style="margin: 0;">-<span id="LC3475" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"dmd-tx-dict-sel"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC3475" class="line" lang="haskell"> <span class="n" style="color: #333;">depFlagSpec</span> <span class="s" style="color: #d14;">"dmd-tx-dict-sel"</span></span>
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<pre style="margin: 0;">+<span id="LC3476" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span> <span class="s" style="color: #d14;">"effect is now unconditionally enabled"</span><span class="p">,</span></span>
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3476
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3477
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<pre style="margin: 0;"> <span id="LC3477" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"do-eta-reduction"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoEtaReduction</span><span class="p">,</span></span>
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3477
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3478
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<pre style="margin: 0;"> <span id="LC3478" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"do-lambda-eta-expansion"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoLambdaEtaExpansion</span><span class="p">,</span></span>
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3478
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3479
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<pre style="margin: 0;"> <span id="LC3479" class="line" lang="haskell"> <span class="n" style="color: #333;">flagSpec</span> <span class="s" style="color: #d14;">"eager-blackholing"</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_EagerBlackHoling</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">@@ -4004,7 +4005,6 @@ optLevelFlags :: [([Int], GeneralFlag)]</td>
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4004
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4005
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<pre style="margin: 0;"> <span id="LC4005" class="line" lang="haskell"><span class="n" style="color: #333;">optLevelFlags</span> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Documenting optimisation flags]</span></span>
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4006
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<pre style="margin: 0;"> <span id="LC4006" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">([</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoLambdaEtaExpansion</span><span class="p">)</span></span>
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4006
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<pre style="margin: 0;"> <span id="LC4007" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DoEtaReduction</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Eta-reduction in -O0]</span></span>
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4007
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<pre style="margin: 0;">-<span id="LC4007" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DmdTxDictSel</span><span class="p">)</span></span>
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4008
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<pre style="margin: 0;"> <span id="LC4008" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">0</span><span class="p">,</span><span class="mi" style="color: #099;">1</span><span class="p">,</span><span class="mi" style="color: #099;">2</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_LlvmTBAA</span><span class="p">)</span></span>
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4009
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4009
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<pre style="margin: 0;"> <span id="LC4009" class="line" lang="haskell"></span>
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4010
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<pre style="margin: 0;"> <span id="LC4010" class="line" lang="haskell"> <span class="p">,</span> <span class="p">([</span><span class="mi" style="color: #099;">0</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_IgnoreInterfacePragmas</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">@@ -353,8 +353,7 @@ by saying ``-fno-wombat``.</td>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="plaintext"> Make dictionaries strict.</span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC355" class="line" lang="plaintext">.. ghc-flag:: -fdmd-tx-dict-sel</span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="plaintext"> :shortdesc: Use a special demand transformer for dictionary selectors.</span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="plaintext"> Always enabled by default.</span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="plaintext"> :shortdesc: *(deprecated)* Use a special demand transformer for dictionary selectors.</span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="plaintext"> :type: dynamic</span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="plaintext"> :reverse: -fno-dmd-tx-dict-sel</span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="plaintext"> :category:</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">@@ -362,6 +361,7 @@ by saying ``-fno-wombat``.</td>
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<pre style="margin: 0;"> <span id="LC361" class="line" lang="plaintext"> :default: on</span>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="plaintext"> Use a special demand transformer for dictionary selectors.</span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="plaintext"> Behaviour is unconditionally enabled starting with 8.14</span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC366" class="line" lang="plaintext">.. ghc-flag:: -fdo-eta-reduction</span>
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<pre style="margin: 0;"> <span id="LC367" class="line" lang="plaintext"> :shortdesc: Enable eta-reduction. Implied by :ghc-flag:`-O`.</span>
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