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<h3>
Simon Peyton Jones pushed to branch wip/T16762
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/9ffdc4d9ffc595882ba5398634ca37a2bf4a307d">9ffdc4d9</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-10-28T17:34:46+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More wibbles
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<h4>2 changed files:</h4>
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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compiler/GHC/Utils/Monad.hs
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ffdc4d9ffc595882ba5398634ca37a2bf4a307d#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -3003,7 +3003,7 @@ bindOuterFamEqnTKBndrs_Q_Tv :: HsOuterFamEqnTyVarBndrs GhcRn</td>
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<pre style="margin: 0;"> <span id="LC3003" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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3004
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3004
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<pre style="margin: 0;"> <span id="LC3004" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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3005
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<pre style="margin: 0;"> <span id="LC3005" class="line" lang="haskell"><span class="n" style="color: #333;">bindOuterFamEqnTKBndrs_Q_Tv</span> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3006
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<pre style="margin: 0;">-<span id="LC3006" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="n" style="color: #333;">getOuterTyVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3006" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="n" style="color: #333;">getOuterTyVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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3007
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<pre style="margin: 0;"> <span id="LC3007" class="line" lang="haskell"> <span class="n" style="color: #333;">bindOuterTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC3008" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">})</span></span>
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3009
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<pre style="margin: 0;"> <span id="LC3009" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</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">@@ -3013,7 +3013,7 @@ bindOuterFamEqnTKBndrs :: HsOuterFamEqnTyVarBndrs GhcRn</td>
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3013
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<pre style="margin: 0;"> <span id="LC3013" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC3014" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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3015
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<pre style="margin: 0;"> <span id="LC3015" class="line" lang="haskell"><span class="n" style="color: #333;">bindOuterFamEqnTKBndrs</span> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3016
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<pre style="margin: 0;">-<span id="LC3016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="n" style="color: #333;">getOuterTyVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="n" style="color: #333;">getOuterTyVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC3017" class="line" lang="haskell"> <span class="n" style="color: #333;">bindOuterTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC3018" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC3019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sm_clone=False: see Note [Cloning for type variable binders]</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">@@ -3096,14 +3096,14 @@ bindExplicitTKBndrs_Q_Skol, bindExplicitTKBndrs_Q_Tv</td>
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<pre style="margin: 0;"> <span id="LC3096" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">],</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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3097
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3097
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<pre style="margin: 0;"> <span id="LC3097" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- These do not clone: see Note [Cloning for type variable binders]</span></span>
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3098
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<pre style="margin: 0;"> <span id="LC3098" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Skol</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3099
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<pre style="margin: 0;">-<span id="LC3099" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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3099
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<pre style="margin: 0;">+<span id="LC3099" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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3100
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3100
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<pre style="margin: 0;"> <span id="LC3100" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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3101
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3101
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<pre style="margin: 0;"> <span id="LC3101" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">})</span></span>
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3102
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3102
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<pre style="margin: 0;"> <span id="LC3102" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3103
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3103
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<pre style="margin: 0;"> <span id="LC3103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sm_clone=False: see Note [Cloning for type variable binders]</span></span>
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3104
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3104
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<pre style="margin: 0;"> <span id="LC3104" class="line" lang="haskell"></span>
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3105
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3105
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<pre style="margin: 0;"> <span id="LC3105" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrs_Q_Tv</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3106
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<pre style="margin: 0;">-<span id="LC3106" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC3106" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="n" style="color: #333;">binderVars</span> <span class="o" style="font-weight: 600;">$</span></span>
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3107
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3107
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<pre style="margin: 0;"> <span id="LC3107" class="line" lang="haskell"> <span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="p">(</span><span class="n" style="color: #333;">smVanilla</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_clone</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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3108
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3108
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<pre style="margin: 0;"> <span id="LC3108" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_tvtv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span> <span class="p">})</span></span>
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3109
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<pre style="margin: 0;"> <span id="LC3109" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_bndrs</span> <span class="n" style="color: #333;">thing_inside</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">@@ -3118,7 +3118,7 @@ bindExplicitTKBndrsX :: (OutputableBndrFlag flag)</td>
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3118
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<pre style="margin: 0;"> <span id="LC3118" class="line" lang="haskell"><span class="n" style="color: #333;">bindExplicitTKBndrsX</span> <span class="n" style="color: #333;">skol_mode</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SM</span> <span class="p">{</span> <span class="n" style="color: #333;">sm_parent</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check_parent</span><span class="p">,</span> <span class="n" style="color: #333;">sm_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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3119
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3119
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<pre style="margin: 0;"> <span id="LC3119" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sm_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_info</span> <span class="p">})</span></span>
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3120
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3120
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<pre style="margin: 0;"> <span id="LC3120" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_tvs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3121
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<pre style="margin: 0;">-<span id="LC3121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"bindExplicTKBndrs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3121" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"bindExplic<span class="idiff left right">it</span>TKBndrs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_tvs</span><span class="p">)</span></span>
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3122
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<pre style="margin: 0;"> <span id="LC3122" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">hs_tvs</span> <span class="p">}</span></span>
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3123
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3123
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<pre style="margin: 0;"> <span id="LC3123" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3124
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3124
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<pre style="margin: 0;"> <span id="LC3124" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_ki_mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyMode</span> <span class="p">{</span> <span class="n" style="color: #333;">mode_tyki</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span><span class="p">,</span> <span class="n" style="color: #333;">mode_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hole_info</span> <span class="p">}</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">@@ -3232,7 +3232,7 @@ bindImplicitTKBndrsX skol_mode@(SM { sm_parent = check_parent, sm_kind = ctxt_ki</td>
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<pre style="margin: 0;"> <span id="LC3232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- SkolemMode</span></span>
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<pre style="margin: 0;"> <span id="LC3233" 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="LC3234" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3235" class="line" lang="haskell"><span class="cd">-- | 'SkolemMode' decribes how to typecheck an explict ('HsTyVarBndr') or</span></span>
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<pre style="margin: 0;">+<span id="LC3235" class="line" lang="haskell"><span class="cd">-- | 'SkolemMode' decribes how to typecheck an explic<span class="idiff left right">i</span>t ('HsTyVarBndr') or</span></span>
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<pre style="margin: 0;"> <span id="LC3236" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- implicit ('Name') binder in a type. It is just a record of flags</span></span>
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<pre style="margin: 0;"> <span id="LC3237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that describe what sort of 'TcTyVar' to create.</span></span>
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<pre style="margin: 0;"> <span id="LC3238" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemMode</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">@@ -3283,15 +3283,15 @@ When we /must not/ clone</td>
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<pre style="margin: 0;"> <span id="LC3283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (in tcDataFamInstDecl) bring p,q into scope before looking at the</span></span>
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<pre style="margin: 0;"> <span id="LC3284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the constructor decls.</span></span>
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<pre style="margin: 0;"> <span id="LC3285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindExplictTKBndrs_Q_Tv/bindImplicitTKBndrs_Q_Tv do not clone</span></span>
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<pre style="margin: 0;">+<span id="LC3286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindExplic<span class="idiff left right">i</span>tTKBndrs_Q_Tv/bindImplicitTKBndrs_Q_Tv do not clone</span></span>
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<pre style="margin: 0;"> <span id="LC3287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We take advantage of this in kcInferDeclHeader:</span></span>
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<pre style="margin: 0;"> <span id="LC3288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> all_tv_prs = mkTyVarNamePairs (scoped_kvs ++ tc_tvs)</span></span>
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<pre style="margin: 0;"> <span id="LC3289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we cloned, we'd need to take a bit more care here; not hard.</span></span>
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<pre style="margin: 0;"> <span id="LC3290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindExplic<span class="idiff left right">tTKBndrs_Q_Skol, bindExplic</span>tTKBndrs_Skol, do not clone.</span></span>
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<pre style="margin: 0;">+<span id="LC3291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* bindExplic<span class="idiff left right">itTKBndrs_Q_Skol, bindExplici</span>tTKBndrs_Skol, do not clone.</span></span>
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<pre style="margin: 0;"> <span id="LC3292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is no need, I think.</span></span>
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<pre style="margin: 0;"> <span id="LC3293" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The payoff here is that avoiding gratuit<span class="idiff left right">i</span>ous cloning means that we can</span></span>
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<pre style="margin: 0;">+<span id="LC3294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The payoff here is that avoiding gratuitous cloning means that we can</span></span>
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<pre style="margin: 0;"> <span id="LC3295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> almost always take the fast path in swizzleTcTyConBndrs.</span></span>
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<pre style="margin: 0;"> <span id="LC3296" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we /must/ clone.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ffdc4d9ffc595882ba5398634ca37a2bf4a307d#cb4ad425e8ed846dfcc5d3793b08b95f6864e545"><strong>compiler/GHC/Utils/Monad.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">@@ -11,7 +11,7 @@ module GHC.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith3M_</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWith4M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zipWithAndUnzipM</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzipM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip3M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip4M</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAndUnzip5M</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumLM</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">applyToFstM</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">applyTo</span>SndM</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">liftFstM</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">lift</span>SndM</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapSndM</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">concatMapM</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapMaybeM</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">@@ -165,11 +165,11 @@ mapSndM f xs = go xs</td>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">b</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">b</span><span class="p">;</span> <span class="n" style="color: #333;">rs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">xs</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">((</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">c</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</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;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>FstM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</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;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">b</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">lift</span>FstM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="p">}</span></span>
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>SndM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</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;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">applyTo</span>SndM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">lift</span>SndM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</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;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">lift</span>SndM</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">thing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="p">}</span></span>
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"></span>
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174
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="cd">-- | Monadic version of concatMap</span></span>
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175
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">concatMapM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="n" style="color: #333;">m</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;">m</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span></span>
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