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<h3>
Ben Gamari pushed to branch wip/T18159
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b785a508eb0829e635ab6cd499a0440176a1187f">b785a508</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-05-07T14:43:17-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement T18159
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<h4>4 changed files:</h4>
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<a href="#7cfcb0b96abd4b74bc589a307600d5b086f2de9f">
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libraries/base/GHC/Exception/Backtrace.hs
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<a href="#f2770d22c9f7ba87d4d0d9b2900286042724bb08">
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libraries/base/GHC/Exception/Backtrace.hs-boot
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<li class="file-stats">
<a href="#6e8212240e47488bd66c7d99dad261a46bf6631a">
libraries/base/GHC/Exception/Type.hs
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<li class="file-stats">
<a href="#b7cfb47853ef95330e499ca0c5b90964744d101f">
libraries/base/base.cabal
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<h4>Changes:</h4>
<li id="7cfcb0b96abd4b74bc589a307600d5b086f2de9f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b785a508eb0829e635ab6cd499a0440176a1187f#7cfcb0b96abd4b74bc589a307600d5b086f2de9f"><strong>libraries/base/GHC/Exception/Backtrace.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE Trustworthy #-}</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NoImplicitPrelude</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3" 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">
3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , ExistentialQuantification</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , MagicHash</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , RecordWildCards</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , PatternSynonyms</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> #-}</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_HADDOCK not-home #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" 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="LC11" class="line" lang="haskell"><span class="cd">-- |</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module : GHC.Exception.Backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Copyright : (c) The University of Glasgow, 2020-2025</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- License : see libraries/base/LICENSE</span></span>
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<pre style="margin: 0;">+<span id="LC15" 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="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Maintainer : cvs-ghc@haskell.org</span></span>
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<td class="diff-line-num new new_line" data-linenumber="17" 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="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stability : internal</span></span>
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<td class="diff-line-num new new_line" data-linenumber="18" 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="LC18" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Portability : non-portable (GHC extensions)</span></span>
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<pre style="margin: 0;">+<span id="LC19" 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="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Exception backtraces.</span></span>
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<pre style="margin: 0;">+<span id="LC21" 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="LC22" 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="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Exception.Backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setGlobalBacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getGlobalBacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Ptr</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack.CCS</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack.CallStack</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.ExecutionStack</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Base</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Show</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="cd">-- | An exception backtrace.</span></span>
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<pre style="margin: 0;">+<span id="LC38" 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="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @since 4.15</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CostCenterBacktrace</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Stack</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CCS</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CostCentreStack</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ a cost center profiler backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HasCallStackBacktrace</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Stack</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CallStack</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ a stack from 'GHC.Stack.HasCallStack'</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ExecutionBacktrace</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ExecutionStack</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Location</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ a stack unwinding (e.g. DWARF) backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="cd">-- | @since 4.15</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span> <span class="kr" style="font-weight: 600;">where</span></span>
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50
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CostCenterBacktrace</span> <span class="n" style="color: #333;">ccs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">ccs</span></span>
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52
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasCallStackBacktrace</span> <span class="n" style="color: #333;">ccs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">ccs</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExecutionBacktrace</span> <span class="n" style="color: #333;">ccs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">ccs</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="cd">-- | How to collect a backtrace when an exception is thrown.</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">BacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoBacktrace</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ don't collect a backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CostCenterBacktrace</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ collect a cost center stacktrace (only available when built with profiling)</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ExecutionStackBacktrace</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ use execution stack unwinding with given limit</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"><span class="n" style="color: #333;">currentBacktraceMechanism</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">BacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="n" style="color: #333;">currentBacktraceMechanism</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafePerformIO</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkIORef</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE currentBacktraceMechanism #-}</span></span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="cd">-- | Set how 'Control.Exception.throwIO', et al. collect backtraces.</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="n" style="color: #333;">setGlobalBacktraceMechanism</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BacktraceMechanism</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="n" style="color: #333;">setGlobalBacktraceMechanism</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">writeIORef</span> <span class="n" style="color: #333;">currentBacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="cd">-- | Returns the currently selected 'BacktraceMechanism'.</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="n" style="color: #333;">getGlobalBacktraceMechanism</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">BacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"><span class="n" style="color: #333;">getGlobalBacktraceMechanism</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">readIORef</span> <span class="n" style="color: #333;">currentBacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="cd">-- | Collect a 'Backtrace' via the current global 'BacktraceMechanism'. See</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'setGlobalBacktraceMechanism'.</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"> <span class="n" style="color: #333;">mech</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getGlobalBacktraceMechanism</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"> <span class="n" style="color: #333;">collectBacktrace'</span> <span class="n" style="color: #333;">mech</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="cd">-- | Collect a 'Backtrace' via the given 'BacktraceMechanism'.</span></span>
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84
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BacktraceMechanism</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace'</span> <span class="kt" style="color: #458; font-weight: 600;">NoBacktrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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86
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace'</span> <span class="kt" style="color: #458; font-weight: 600;">CostCenterBacktrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CostCenterBacktrace</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getCurrentCCS</span></span>
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87
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"><span class="n" style="color: #333;">collectBacktrace'</span> <span class="kt" style="color: #458; font-weight: 600;">ExecutionStackBacktrace</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">ExecutionBacktrace</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">getStackTrace</span></span></pre>
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<li id="f2770d22c9f7ba87d4d0d9b2900286042724bb08">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b785a508eb0829e635ab6cd499a0440176a1187f#f2770d22c9f7ba87d4d0d9b2900286042724bb08"><strong>libraries/base/GHC/Exception/Backtrace.hs-boot</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE NoImplicitPrelude #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Exception.Backtrace</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backtrace</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Show</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">Backtrace</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b785a508eb0829e635ab6cd499a0440176a1187f#6e8212240e47488bd66c7d99dad261a46bf6631a"><strong>libraries/base/GHC/Exception/Type.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">@@ -22,12 +22,18 @@</td>
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<pre style="margin: 0;"> <span id="LC22" 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="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Exception.Type</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Class</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">ArithException</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="p">(</span> <span class="c1" style="color: #998; font-style: italic;">-- * Fundamentals</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Concrete exception types</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArithException</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">divZeroException</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">overflowException</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ratioZeroDenomException</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">underflowException</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Exception</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Backtrace</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Backtrace</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Typeable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Typeable</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cast</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- loop: Data.Typeable -> GHC.Err -> GHC.Exception</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">@@ -39,11 +45,23 @@ The @SomeException@ type is the root of the exception type hierarchy.</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When an exception of type @e@ is thrown, behind the scenes it is</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encapsulated in a @SomeException@.</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">e</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Exception</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">SomeException</span></span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">e</span><span class="o" style="font-weight: 600;"><span class="idiff left">.</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Exception</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">e</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">SomeExceptionWithLocation</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Maybe</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Backtrace</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="cd">-- | @since 3.0</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TODO: Should this obey the usual Show-is-Haskell invariant?</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SomeExceptionWithLocation</span> <span class="n" style="color: #333;">mb_bt</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"> <span class="n" style="color: #333;">showsPrec</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">backtrace</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"> <span class="n" style="color: #333;">backtrace</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_bt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC58" 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="s" style="color: #d14;">""</span></span>
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<td class="diff-line-num new new_line" data-linenumber="59" 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">
59
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">bt</span> <span class="o" style="font-weight: 600;">-></span> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">Backtrace:</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">show</span> <span class="n" style="color: #333;">bt</span></span>
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60
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"></span>
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61
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">SomeExceptionWithLocation</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">e</span></span>
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62
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="63" 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">
63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SomeException</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SomeExceptionWithLocation</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">e</span></span>
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64
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"></span>
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47
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65
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"></span>
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48
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66
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- |</span></span>
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49
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Any type that you wish to throw or catch as an exception must be an</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b785a508eb0829e635ab6cd499a0440176a1187f#b7cfb47853ef95330e499ca0c5b90964744d101f"><strong>libraries/base/base.cabal</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">@@ -218,6 +218,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="plaintext"> GHC.Environment</span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="plaintext"> GHC.Err</span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="plaintext"> GHC.Exception</span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext"> GHC.Exception.Backtrace</span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="plaintext"> GHC.Exception.Type</span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="plaintext"> GHC.ExecutionStack</span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="plaintext"> GHC.ExecutionStack.Internal</span>
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