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<h3>
Vilem-Benjamin Liepelt pushed to branch wip/buggymcbugfix/15185-enum-int
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc47ad267b81673626e07731530a6cb90734d725">fc47ad26</a></strong>
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<span>by buggymcbugfix</span>
<i>at 2020-05-13T13:31:17+03:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add inline pragmas to Enum methods
Fixes t15185
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<h4>1 changed file:</h4>
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<a href="#942b2b2f85929d9bc99c051d24e2202de971dd09">
libraries/base/GHC/Enum.hs
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<h4>Changes:</h4>
<li id="942b2b2f85929d9bc99c051d24e2202de971dd09">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc47ad267b81673626e07731530a6cb90734d725#942b2b2f85929d9bc99c051d24e2202de971dd09"><strong>libraries/base/GHC/Enum.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">@@ -139,13 +139,36 @@ class Enum a where</td>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * @enumFromThenTo 6 8 2 :: [Int] = []@</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromThenTo</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="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"> <span class="n" style="color: #333;">succ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toEnum</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fromEnum</span></span>
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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toEnum</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="n" style="color: #333;">subtract</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fromEnum</span></span>
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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFrom</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">..</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromThen</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">..</span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromTo</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"> <span class="n" style="color: #333;">succ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toEnum</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fromEnum</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">toEnum</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(</span><span class="n" style="color: #333;">subtract</span> <span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fromEnum</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Stable Unfolding for Enum methods]</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE enumFrom #-}</span></span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFrom</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">..</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Stable Unfolding for Enum methods]</span></span>
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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE enumFromThen #-}</span></span>
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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromThen</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">..</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Stable Unfolding for Enum methods]</span></span>
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE enumFromTo #-}</span></span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromTo</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Stable Unfolding for Enum methods]</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# INLINABLE enumFromThenTo #-}</span></span>
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147
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="n" style="color: #333;">enumFromThenTo</span> <span class="n" style="color: #333;">x1</span> <span class="n" style="color: #333;">x2</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x1</span><span class="p">,</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">x2</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">y</span><span class="p">]</span></span>
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148
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC162" 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="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Stable Unfolding for Enum methods]</span></span>
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164
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The INLINABLE pragmas ensure that we export stable (unoptimised) unfoldings in</span></span>
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167
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the interface file so we can do list fusion at usage sites outside this module.</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 class="cm" style="color: #998; font-style: italic;">Fixes https://gitlab.haskell.org/ghc/ghc/issues/15185</span></span>
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170
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"></span>
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149
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Default methods for bounded enumerations</span></span>
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150
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"><span class="n" style="color: #333;">boundedEnumFrom</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Enum</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bounded</span> <span class="n" style="color: #333;">a</span><span class="p">)</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="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<td class="diff-line-num new_line" data-linenumber="174" 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">
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">boundedEnumFrom</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toEnum</span> <span class="p">[</span><span class="n" style="color: #333;">fromEnum</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">..</span> <span class="n" style="color: #333;">fromEnum</span> <span class="p">(</span><span class="n" style="color: #333;">maxBound</span> <span class="p">`</span><span class="n" style="color: #333;">asTypeOf</span><span class="p">`</span> <span class="n" style="color: #333;">n</span><span class="p">)]</span></span>
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