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Marge Bot pushed to branch master
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b689f3db0229ac58af5383796fb13c6d40e358ce">b689f3db</a></strong>
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<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:46-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add clamping naturalToWord (fix #18697)
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<h4>1 changed file:</h4>
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<a href="#5dc54b4a66d677ebfb19cf2c7ab82ee3c45e2100">
libraries/ghc-bignum/src/GHC/Num/Natural.hs
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<h4>Changes:</h4>
<li id="5dc54b4a66d677ebfb19cf2c7ab82ee3c45e2100">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b689f3db0229ac58af5383796fb13c6d40e358ce#5dc54b4a66d677ebfb19cf2c7ab82ee3c45e2100"><strong>libraries/ghc-bignum/src/GHC/Num/Natural.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">@@ -107,6 +107,14 @@ naturalToWord# (NB b) = bigNatIndex# b 0#</td>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWord</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Natural</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWord</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">W</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">naturalToWord</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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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="cd">-- | Convert a Natural into a Word# clamping to (maxBound :: Word#).</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWordClamp</span><span class="o" style="font-weight: 600;">#</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Natural</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="o" style="font-weight: 600;">#</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWordClamp</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NS</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWordClamp</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NB</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WORD_MAXBOUND</span><span class="o" style="font-weight: 600;">##</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cd">-- | Convert a Natural into a Word# clamping to (maxBound :: Word).</span></span>
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWordClamp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Natural</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Word</span></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="n" style="color: #333;">naturalToWordClamp</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">W</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">naturalToWordClamp</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="cd">-- | Try downcasting 'Natural' to 'Word' value.</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns '()' if value doesn't fit in 'Word'.</span></span>
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