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<h3>

chessai pushed to branch wip/data-dot-foldable-optimisations

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

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<h4>

Commits:

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<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62edf22a727e03c854ff8b613bd5177e0b81e3c2">62edf22a</a></strong>

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<span>by chessai</span>

<i>at 2020-10-27T14:53:55-07:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimisations in Data.Foldable (T17867)

This PR concerns the following functions from `Data.Foldable`:

* minimum

* maximum

* sum

* product

* minimumBy

* maximumBy

- Default implementations of these functions now use `foldl'` or `foldMap'`.

- All have been marked with INLINEABLE to make room for further optimisations.

</pre>

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<h4>1 changed file:</h4>

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<li class="file-stats">

<a href="#7effb7b87b177d4253aa44d167e73a7082734a39">

libraries/base/Data/Foldable.hs

</a>

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<h4>Changes:</h4>

<li id="7effb7b87b177d4253aa44d167e73a7082734a39">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62edf22a727e03c854ff8b613bd5177e0b81e3c2#7effb7b87b177d4253aa44d167e73a7082734a39"><strong>libraries/base/Data/Foldable.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="507" 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="diff-line-num unfold js-unfold new_line" data-linenumber="507" 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">@@ -507,7 +507,8 @@ class Foldable t where</td>

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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- @since 4.8.0.0</span></span>

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<td class="diff-line-num old_line" data-linenumber="508" 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="LC508" class="line" lang="haskell">    <span class="n" style="color: #333;">maximum</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">Ord</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">t</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>

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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell">    <span class="n" style="color: #333;">maximum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"maximum: empty structure"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">-<span id="LC510" class="line" lang="haskell">       <span class="n" style="color: #333;">getMax</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Max</span> <span class="o" style="font-weight: 600;">#.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</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="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="LC510" class="line" lang="haskell">       <span class="n" style="color: #333;">getMax</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldMap'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Max</span> <span class="o" style="font-weight: 600;">#.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</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="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="LC511" class="line" lang="haskell">    <span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE maximum #-}</span></span>

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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- | The least element of a non-empty structure.</span></span>

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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="529" 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="diff-line-num unfold js-unfold new_line" data-linenumber="530" 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">@@ -529,7 +530,8 @@ class Foldable t where</td>

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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- @since 4.8.0.0</span></span>

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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell">    <span class="n" style="color: #333;">minimum</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</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;">Ord</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">t</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>

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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell">    <span class="n" style="color: #333;">minimum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"minimum: empty structure"</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span></span>

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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell">       <span class="n" style="color: #333;">getMin</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Min</span> <span class="o" style="font-weight: 600;">#.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</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="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="LC533" class="line" lang="haskell">       <span class="n" style="color: #333;">getMin</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldMap'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Min</span> <span class="o" style="font-weight: 600;">#.</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</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="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="LC534" class="line" lang="haskell">    <span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE minimum #-}</span></span>

</pre>

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533

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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- | The 'sum' function computes the sum of the numbers of a structure.</span></span>

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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="554" 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="diff-line-num unfold js-unfold new_line" data-linenumber="556" 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">@@ -554,7 +556,8 @@ class Foldable t where</td>

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<pre style="margin: 0;"> <span id="LC556" 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="LC557" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- @since 4.8.0.0</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC558" class="line" lang="haskell">    <span class="n" style="color: #333;">sum</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">t</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>

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<td class="diff-line-num new_line old" data-linenumber="559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC557" class="line" lang="haskell">    <span class="n" style="color: #333;">sum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getSum</span> <span class="o" style="font-weight: 600;">#.</span> <span class="n" style="color: #333;">foldMap</span> <span class="kt" style="color: #458; font-weight: 600;">Sum</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="558" 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="LC559" class="line" lang="haskell">    <span class="n" style="color: #333;">sum</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getSum</span> <span class="o" style="font-weight: 600;">#.</span> <span class="n" style="color: #333;">foldMap'</span> <span class="kt" style="color: #458; font-weight: 600;">Sum</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="558" 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="LC560" class="line" lang="haskell">    <span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE sum #-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="558" 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">

558

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<td class="diff-line-num new_line" data-linenumber="561" 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">

561

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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="559" 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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<td class="diff-line-num new_line" data-linenumber="562" 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="LC562" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- | The 'product' function computes the product of the numbers of a</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="560" 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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<td class="diff-line-num new_line" data-linenumber="563" 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="LC563" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- structure.</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="580" 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="diff-line-num unfold js-unfold new_line" data-linenumber="583" 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">@@ -580,7 +583,8 @@ class Foldable t where</td>

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<td class="diff-line-num old_line" data-linenumber="580" 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">

580

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<pre style="margin: 0;"> <span id="LC583" 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 old_line" data-linenumber="581" 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">

581

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<td class="diff-line-num new_line" data-linenumber="584" 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">

584

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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- @since 4.8.0.0</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="582" 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">

582

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585

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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell">    <span class="n" style="color: #333;">product</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Num</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">t</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>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell">    <span class="n" style="color: #333;">product</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getProduct</span> <span class="o" style="font-weight: 600;">#.</span> <span class="n" style="color: #333;">foldMap</span> <span class="kt" style="color: #458; font-weight: 600;">Product</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="584" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="586" 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">

586

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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell">    <span class="n" style="color: #333;">product</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getProduct</span> <span class="o" style="font-weight: 600;">#.</span> <span class="n" style="color: #333;">foldMap'</span> <span class="kt" style="color: #458; font-weight: 600;">Product</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="587" 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">

587

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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell">    <span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE product #-}</span></span>

</pre>

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584

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588

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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="585" 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">

585

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<td class="diff-line-num new_line" data-linenumber="589" 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">

589

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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instances for Prelude types</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="586" 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">

586

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<td class="diff-line-num new_line" data-linenumber="590" 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">

590

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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1111" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1115" 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">@@ -1111,10 +1115,15 @@ all p = getAll #. foldMap (All #. p)</td>

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1111

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1115

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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1112" 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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1116

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<pre style="margin: 0;"> <span id="LC1116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [maximumBy/minimumBy space usage]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1113" 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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<td class="diff-line-num new_line" data-linenumber="1117" 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">

1117

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<pre style="margin: 0;"> <span id="LC1117" class="line" lang="haskell"><span class="n" style="color: #333;">maximumBy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foldable</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">Ordering</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">t</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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1114

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<td class="diff-line-num new_line old" data-linenumber="1118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"><span class="n" style="color: #333;">maximumBy</span> <span class="n" style="color: #333;">cmp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl1</span> <span class="n" style="color: #333;">max'</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1115

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<td class="diff-line-num new_line old" data-linenumber="1118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1115" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">max'</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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cmp</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1116

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<td class="diff-line-num new_line old" data-linenumber="1118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1116" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">GT</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1117

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<td class="diff-line-num new_line old" data-linenumber="1118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1117" class="line" lang="haskell">                        <span class="kr" style="font-weight: 600;">_</span>  <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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="1118" 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">

1118

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<pre style="margin: 0;">+<span id="LC1118" class="line" lang="haskell"><span class="n" style="color: #333;">maximumBy</span> <span class="n" style="color: #333;">cmp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"maximumBy: empty structure"</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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="1119" 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">

1119

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<pre style="margin: 0;">+<span id="LC1119" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">max'</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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="1120" 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">

1120

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<pre style="margin: 0;">+<span id="LC1120" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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="1121" 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">

1121

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<pre style="margin: 0;">+<span id="LC1121" class="line" lang="haskell">    <span class="n" style="color: #333;">max'</span> <span class="n" style="color: #333;">mx</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mx</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1122" 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">

1122

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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1123" 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">

1123

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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cmp</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1124" 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">

1124

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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell">        <span class="kt" style="color: #458; font-weight: 600;">GT</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1125" 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">

1125

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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell">        <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1118" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1126" 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">

1126

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<pre style="margin: 0;">+<span id="LC1126" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE maximumBy #-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1118" 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">

1118

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<td class="diff-line-num new_line" data-linenumber="1127" 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">

1127

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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1119" 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">

1119

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<td class="diff-line-num new_line" data-linenumber="1128" 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">

1128

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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"><span class="cd">-- | The least element of a non-empty structure with respect to the</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1120" 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">

1120

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<td class="diff-line-num new_line" data-linenumber="1129" 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">

1129

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<pre style="margin: 0;"> <span id="LC1129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given comparison function.</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1128" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1137" 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">@@ -1128,10 +1137,15 @@ maximumBy cmp = foldl1 max'</td>

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<td class="diff-line-num old_line" data-linenumber="1128" 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">

1128

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<td class="diff-line-num new_line" data-linenumber="1137" 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">

1137

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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1129" 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">

1129

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<td class="diff-line-num new_line" data-linenumber="1138" 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">

1138

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<pre style="margin: 0;"> <span id="LC1138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [maximumBy/minimumBy space usage]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1130" 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">

1130

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<td class="diff-line-num new_line" data-linenumber="1139" 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">

1139

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<pre style="margin: 0;"> <span id="LC1139" class="line" lang="haskell"><span class="n" style="color: #333;">minimumBy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Foldable</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">Ordering</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">t</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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1131

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<td class="diff-line-num new_line old" data-linenumber="1140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1131" class="line" lang="haskell"><span class="n" style="color: #333;">minimumBy</span> <span class="n" style="color: #333;">cmp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl1</span> <span class="n" style="color: #333;">min'</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1132

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<td class="diff-line-num new_line old" data-linenumber="1140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">min'</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="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cmp</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1133

</td>

<td class="diff-line-num new_line old" data-linenumber="1140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1133" class="line" lang="haskell">                        <span class="kt" style="color: #458; font-weight: 600;">GT</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1134

</td>

<td class="diff-line-num new_line old" data-linenumber="1140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1134" class="line" lang="haskell">                        <span class="kr" style="font-weight: 600;">_</span>  <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1140" 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">

1140

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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"><span class="n" style="color: #333;">minimumBy</span> <span class="n" style="color: #333;">cmp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fromMaybe</span> <span class="p">(</span><span class="n" style="color: #333;">errorWithoutStackTrace</span> <span class="s" style="color: #d14;">"minimumBy: empty structure"</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1141" 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">

1141

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<pre style="margin: 0;">+<span id="LC1141" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">min'</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1142" 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">

1142

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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1143" 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">

1143

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<pre style="margin: 0;">+<span id="LC1143" class="line" lang="haskell">    <span class="n" style="color: #333;">min'</span> <span class="n" style="color: #333;">mx</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mx</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1144" 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">

1144

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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1145" 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">

1145

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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cmp</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1146" 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">

1146

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<pre style="margin: 0;">+<span id="LC1146" class="line" lang="haskell">        <span class="kt" style="color: #458; font-weight: 600;">GT</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">y</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1147" 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">

1147

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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell">        <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1135" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1148" 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">

1148

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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINEABLE minimumBy #-}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1135" 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">

1135

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<td class="diff-line-num new_line" data-linenumber="1149" 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">

1149

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<pre style="margin: 0;"> <span id="LC1149" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1136" 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">

1136

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<td class="diff-line-num new_line" data-linenumber="1150" 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">

1150

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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"><span class="cd">-- | 'notElem' is the negation of 'elem'.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1137" 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">

1137

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<td class="diff-line-num new_line" data-linenumber="1151" 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">

1151

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<pre style="margin: 0;"> <span id="LC1151" 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 unfold js-unfold old_line" data-linenumber="1268" 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="diff-line-num unfold js-unfold new_line" data-linenumber="1282" 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">@@ -1268,12 +1282,6 @@ proportional to the size of the data structure. For the common case of lists,</td>

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<td class="diff-line-num old_line" data-linenumber="1268" 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">

1268

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<td class="diff-line-num new_line" data-linenumber="1282" 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">

1282

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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this could be particularly bad (see #10830).</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1269" 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">

1269

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<td class="diff-line-num new_line" data-linenumber="1283" 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">

1283

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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1270" 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">

1270

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<td class="diff-line-num new_line" data-linenumber="1284" 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">

1284

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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For the common case of lists, switching the implementations of maximumBy and</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1271" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1271

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">minimumBy to foldl1 solves the issue, as GHC's strictness analysis can then</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1272" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1272

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">make these functions only use O(1) stack space. It is perhaps not the optimal</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1273" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1273

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">way to fix this problem, as there are other conceivable data structures</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1274" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1274

</td>

<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(besides lists) which might benefit from specialized implementations for</span></span>

</pre>

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1275

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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">maximumBy and minimumBy (see</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1276" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1276

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">https://gitlab.haskell.org/ghc/ghc/issues/10830#note_129843 for a further</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1277" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1277

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">discussion). But using foldl1 is at least always better than using foldr1, so</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1278" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1278

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<td class="diff-line-num new_line old" data-linenumber="1285" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC has chosen to adopt that approach for now.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1279" 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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1285

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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">minimumBy to foldl1 solves the issue, assuming GHC's strictness analysis can then</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1279" 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="1286" 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">

1286

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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">make these functions only use O(1) stack space. As of base 4.16, we have switched to employing foldl' over foldl1, not relying on GHC's optimiser in general. See https://gitlab.haskell.org/ghc/ghc/-/issues/17867 for more context.</span></span>

</pre>

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1279

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<td class="diff-line-num new_line" data-linenumber="1287" 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">

1287

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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>

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