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Marge Bot pushed to branch master
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/2643ba465cd2a133b6f495f34fc59cd1a6d23525">2643ba46</a></strong>
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<span>by Paavo</span>
<i>at 2020-03-24T08:31:32-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example and doc for Arg (Fixes #17153)
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<h4>1 changed file:</h4>
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libraries/base/Data/Semigroup.hs
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<h4>Changes:</h4>
<li id="c4f017fa9974a726de9e40cc73a72967c443cef4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2643ba465cd2a133b6f495f34fc59cd1a6d23525#c4f017fa9974a726de9e40cc73a72967c443cef4"><strong>libraries/base/Data/Semigroup.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">@@ -286,7 +286,15 @@ instance Num a => Num (Max a) where</td>
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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC287" class="line" lang="haskell"><span class="cd">-- | 'Arg' isn't itself a 'Semigroup' in its own right, but it can be</span></span>
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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- placed inside 'Min' and 'Max' to compute an arg min or arg max.</span></span>
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<pre style="margin: 0;">-<span id="LC289" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Arg</span> <span class="n" style="color: #333;">a</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;">Arg</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">deriving</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- >>> minimum [ Arg (x * x) x | x <- [-10 .. 10] ]</span></span>
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Arg 0 0</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Arg</span> <span class="n" style="color: #333;">a</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;">Arg</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The argument used for comparisons in 'Eq' and 'Ord'.</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The "value" exposed via the 'Functor', 'Foldable' etc. instances.</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 4.9.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Read</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 4.9.0.0</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Data</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 4.9.0.0</span></span>
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