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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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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44d7ae08442ae6227db37cacc97fe0def8017c5">f44d7ae0</a></strong>
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<span>by Simon Jakobi</span>
<i>at 2020-05-29T01:40:34-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Scrap deprecation plan for Data.Monoid.{First,Last}
See the discussion on the libraries mailing list for context:
https://mail.haskell.org/pipermail/libraries/2020-April/030357.html
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<h4>2 changed files:</h4>
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libraries/base/Data/Monoid.hs
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libraries/base/changelog.md
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<h4>Changes:</h4>
<li id="d28e8f7991f23b5670e34ba0c037beefb6bf58a9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44d7ae08442ae6227db37cacc97fe0def8017c5#d28e8f7991f23b5670e34ba0c037beefb6bf58a9"><strong>libraries/base/Data/Monoid.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">@@ -129,16 +129,6 @@ import Data.Semigroup.Internal</td>
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<pre style="margin: 0;"> <span id="LC129" 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="LC130" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- >>> getFirst (First (Just "hello") <> First Nothing <> First (Just "world"))</span></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just "hello"</span></span>
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<pre style="margin: 0;">-<span id="LC132" 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="LC133" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use of this type is discouraged. Note the following equivalence:</span></span>
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<pre style="margin: 0;">-<span id="LC134" 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="LC135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Data.Monoid.First x === Maybe (Data.Semigroup.First x)</span></span>
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<pre style="margin: 0;">-<span id="LC136" 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="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In addition to being equivalent in the structural sense, the two</span></span>
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- also have 'Monoid' instances that behave the same. This type will</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be marked deprecated in GHC 8.8, and removed in GHC 8.10.</span></span>
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Users are advised to use the variant from "Data.Semigroup" and wrap</span></span>
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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it in 'Maybe'.</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">First</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">First</span> <span class="p">{</span> <span class="n" style="color: #333;">getFirst</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 2.01</span></span>
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 2.01</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">@@ -168,16 +158,6 @@ instance Monoid (First a) where</td>
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<pre style="margin: 0;"> <span id="LC158" 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="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- >>> getLast (Last (Just "hello") <> Last Nothing <> Last (Just "world"))</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;">-- Just "world"</span></span>
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<pre style="margin: 0;">-<span id="LC171" 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="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use of this type is discouraged. Note the following equivalence:</span></span>
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<pre style="margin: 0;">-<span id="LC173" 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="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > Data.Monoid.Last x === Maybe (Data.Semigroup.Last x)</span></span>
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<pre style="margin: 0;">-<span id="LC175" 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="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In addition to being equivalent in the structural sense, the two</span></span>
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177
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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- also have 'Monoid' instances that behave the same. This type will</span></span>
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178
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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- be marked deprecated in GHC 8.8, and removed in GHC 8.10.</span></span>
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179
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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Users are advised to use the variant from "Data.Semigroup" and wrap</span></span>
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180
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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it in 'Maybe'.</span></span>
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181
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Last</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Last</span> <span class="p">{</span> <span class="n" style="color: #333;">getLast</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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182
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 2.01</span></span>
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183
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ @since 2.01</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44d7ae08442ae6227db37cacc97fe0def8017c5#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</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">@@ -11,6 +11,9 @@</td>
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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="p"> *</span> Add <span class="sb" style="color: #d14;">`singleton`</span> function for <span class="sb" style="color: #d14;">`Data.List.NonEmpty`</span>.</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="markdown"><span class="p"> *</span> The planned deprecation of <span class="sb" style="color: #d14;">`Data.Monoid.First`</span> and <span class="sb" style="color: #d14;">`Data.Monoid.Last`</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="markdown"> is scrapped due to difficulties with the suggested migration path.</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="markdown"><span class="p"> *</span> Add <span class="sb" style="color: #d14;">`Generic`</span> instances to <span class="sb" style="color: #d14;">`Fingerprint`</span>, <span class="sb" style="color: #d14;">`GiveGCStats`</span>, <span class="sb" style="color: #d14;">`GCFlags`</span>,</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="markdown"> <span class="sb" style="color: #d14;">`ConcFlags`</span>, <span class="sb" style="color: #d14;">`DebugFlags`</span>, <span class="sb" style="color: #d14;">`CCFlags`</span>, <span class="sb" style="color: #d14;">`DoHeapProfile`</span>, <span class="sb" style="color: #d14;">`ProfFlags`</span>,</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="markdown"> <span class="sb" style="color: #d14;">`DoTrace`</span>, <span class="sb" style="color: #d14;">`TraceFlags`</span>, <span class="sb" style="color: #d14;">`TickyFlags`</span>, <span class="sb" style="color: #d14;">`ParFlags`</span>, <span class="sb" style="color: #d14;">`RTSFlags`</span>, <span class="sb" style="color: #d14;">`RTSStats`</span>,</span>
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