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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93">be63d299</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2019-06-07T14:25:16Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix isValidNatural: The BigNat in NatJ# must have at least 2 limbs

Previously the `integer-gmp` variant of `isValidNatural` would fail to
detect values `<= maxBound::Word` that were incorrectly encoded using
the `NatJ#` constructor.
</pre>
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<h4>6 changed files:</h4>
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<a href="#46c80015097b2e2957c16b1c2e171277c054b66d">
libraries/base/GHC/Natural.hs
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<li class="file-stats">
<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
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<a href="#b817c80cbb15890d9a6df41e91d15d7442471f3c">
libraries/base/tests/all.T
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<a href="#a2dbdf258298ca2c95e49dbb8cc5416f6088116c">
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libraries/base/tests/isValidNatural.hs
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libraries/base/tests/isValidNatural.stdout
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<a href="#cb2fcd7df62c53e64e73858c4413c1e22fd30f24">
libraries/integer-gmp/src/GHC/Integer/Type.hs
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<h4>Changes:</h4>
<li id="46c80015097b2e2957c16b1c2e171277c054b66d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#46c80015097b2e2957c16b1c2e171277c054b66d"><strong>libraries/base/GHC/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">@@ -157,7 +157,9 @@ data Natural = NatS#                 GmpLimb# -- ^ in @[0, maxBound::Word]@</td>
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"><span class="n" style="color: #333;">isValidNatural</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;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"><span class="n" style="color: #333;">isValidNatural</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NatS</span><span class="o" style="font-weight: 600;">#</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;">True</span></span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"><span class="n" style="color: #333;">isValidNatural</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NatJ</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">bn</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">isValidBigNat</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">bn</span><span class="p">)</span></span>
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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;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">sizeofBigNat</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">bn</span> <span class="o" style="font-weight: 600;">>#</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">-- A 1-limb BigNat could fit into a NatS#, so we</span></span>
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">-- require at least 2 limbs.</span></span>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell">                            <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTrue</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="n" style="color: #333;">sizeofBigNat</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">bn</span> <span class="o" style="font-weight: 600;">>#</span> <span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">signumNatural</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;">Natural</span></span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"><span class="n" style="color: #333;">signumNatural</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NatS</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span><span class="o" 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;">NatS</span><span class="o" style="font-weight: 600;">#</span> <span class="mi" style="color: #099;">0</span><span class="o" style="font-weight: 600;">##</span></span>
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<li id="392e9dfd3417e267d708c5ab16536f2994d43745">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</strong></a>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="markdown"><span class="p">  *</span> Add a <span class="sb" style="color: #d14;">`TestEquality`</span> instance for the <span class="sb" style="color: #d14;">`Compose`</span> newtype.</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown"><span class="p">  *</span> Fix the <span class="sb" style="color: #d14;">`integer-gmp`</span> variant of <span class="sb" style="color: #d14;">`isValidNatural`</span>: Previously it would fail</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="markdown">    to detect values <span class="sb" style="color: #d14;">`<= maxBound::Word`</span> that were incorrectly encoded using</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="markdown">    the <span class="sb" style="color: #d14;">`NatJ#`</span> constructor.</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.13.0.0 *TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="markdown"><span class="p">  *</span> Bundled with GHC <span class="ge" style="font-style: italic;">*TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="markdown"></span>
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<li id="b817c80cbb15890d9a6df41e91d15d7442471f3c">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#b817c80cbb15890d9a6df41e91d15d7442471f3c"><strong>libraries/base/tests/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">@@ -40,6 +40,7 @@ test('take001', extra_run_opts('1'), compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'inits'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'genericNegative001'</span><span class="p">,</span> <span class="nv" style="color: #008080;">extra_run_opts</span><span class="p">(</span><span class="s" style="color: #d14;">'-1'</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'ix001'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'isValidNatural'</span><span class="p">,</span> <span class="nv" style="color: #008080;">reqlib</span><span class="p">(</span><span class="s" style="color: #d14;">'integer-gmp'</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># need to add -K64m to the compiler opts, so that GHCi gets it too</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'ioref001'</span><span class="p">,</span></span>
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<br>
</li>
<li id="a2dbdf258298ca2c95e49dbb8cc5416f6088116c">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#a2dbdf258298ca2c95e49dbb8cc5416f6088116c"><strong>libraries/base/tests/isValidNatural.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 MagicHash #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Integer.GMP.Internals</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Natural</span></span>
</pre>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
</pre>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">print</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">isValidNatural</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="n" style="color: #333;">maxWord</span><span class="p">,</span> <span class="n" style="color: #333;">maxWord</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">,</span> <span class="n" style="color: #333;">invalid</span><span class="p">]</span></span>
</pre>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell">    <span class="n" style="color: #333;">maxWord</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromIntegral</span> <span class="p">(</span><span class="n" style="color: #333;">maxBound</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Word</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="9" 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">
9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell">    <span class="n" style="color: #333;">invalid</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NatJ</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">oneBigNat</span> <span class="c1" style="color: #998; font-style: italic;">-- 1 would fit into the NatS# constructor.</span></span></pre>
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<li id="9c4464b70b6704bbfcdf3d62aa8a5df75d5f8857">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#9c4464b70b6704bbfcdf3d62aa8a5df75d5f8857"><strong>libraries/base/tests/isValidNatural.stdout</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">[True,True,True,True,False]</span></pre>
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</li>
<li id="cb2fcd7df62c53e64e73858c4413c1e22fd30f24">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93#cb2fcd7df62c53e64e73858c4413c1e22fd30f24"><strong>libraries/integer-gmp/src/GHC/Integer/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1778" 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">@@ -1778,6 +1778,8 @@ foreign import ccall unsafe "gmp.h __gmpn_popcount"</td>
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- BigNat-wrapped ByteArray#-primops</span></span>
</pre>
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1780" 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="LC1780" class="line" lang="haskell"><span class="cd">-- | Return number of limbs contained in 'BigNat'.</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1781" 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">
1781
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<pre style="margin: 0;">+<span id="LC1781" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1781" 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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<td class="diff-line-num new new_line" data-linenumber="1782" 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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<pre style="margin: 0;">+<span id="LC1782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The result is always @>= 1@ since even zero is encoded with 1 limb.</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"><span class="n" style="color: #333;">sizeofBigNat</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;">BigNat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">GmpSize</span><span class="o" style="font-weight: 600;">#</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1784" class="line" lang="haskell"><span class="n" style="color: #333;">sizeofBigNat</span><span class="o" style="font-weight: 600;">#</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BN</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC1785" class="line" lang="haskell">    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sizeofByteArray</span><span class="o" style="font-weight: 600;">#</span> <span class="n" style="color: #333;">x</span><span class="o" style="font-weight: 600;">#</span> <span class="p">`</span><span class="n" style="color: #333;">uncheckedIShiftRL</span><span class="o" style="font-weight: 600;">#</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">GMP_LIMB_SHIFT</span><span class="o" style="font-weight: 600;">#</span></span>
</pre>
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