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<h3>
Andreas Klebinger pushed to branch wip/andreask/rec_field_shapes
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/1a29762d494ef8ee99caaf7792398923e566a32a">1a29762d</a></strong>
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<span>by Andreas Klebinger</span>
<i>at 2020-06-15T01:30:35+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">findTypeShape: Properly deal with recursive types.
Now we check for recursive types by:
* Traversing the data type in a dfs fashion.
* Remembering seen types along the way.
* Bailing out if any type is seen twice along a path.
This is sadly less performant than what we did before. Where we simply looked
at TyCon's instead of types. However it properly distinguishes between
nested non-recursive ty-cons and recursive types. Something the old
approach was fundamentally not able to do.
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<a href="#f4421b4e35592648510c877ecf55b1af2b96dcee">
compiler/GHC/Core/Opt/WorkWrap/Utils.hs
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<li class="file-stats">
<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<h4>Changes:</h4>
<li id="8104fa1b71db6cfc4eb90cd769463d9eb9004619">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a29762d494ef8ee99caaf7792398923e566a32a#8104fa1b71db6cfc4eb90cd769463d9eb9004619"><strong>compiler/GHC/Core/Opt/DmdAnal.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">@@ -48,6 +48,7 @@ import GHC.Types.Unique.Set</td>
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<pre style="margin: 0;"> <span id="LC48" 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="LC49" 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="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE dmdAnalProgram #-}</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalProgram</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoreProgram</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;">CoreProgram</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="n" style="color: #333;">dmdAnalProgram</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">binds</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="LC54" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyAnalEnv</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fam_envs</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1253" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1252,7 +1253,7 @@ findBndrDmd env arg_of_dfun dmd_ty id</td>
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<pre style="margin: 0;"> <span id="LC1253" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dmd_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">dmd'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1254" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1255" class="line" lang="haskell"> <span class="n" style="color: #333;">dmd'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">strictify</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1255" class="line" lang="haskell"> <span class="n" style="color: #333;">trimToType</span> <span class="n" style="color: #333;">starting_dmd</span> <span class="p">(</span><span class="n" style="color: #333;">findTypeShape</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">id_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1256" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">trimToType</span> <span class="n" style="color: #333;">starting_dmd</span> <span class="p">(</span><span class="n" style="color: #333;">findTypeShape</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">id_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1257" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dmd_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">starting_dmd</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">peelFV</span> <span class="n" style="color: #333;">dmd_ty</span> <span class="n" style="color: #333;">id</span></span>
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell"></span>
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<li id="f4421b4e35592648510c877ecf55b1af2b96dcee">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a29762d494ef8ee99caaf7792398923e566a32a#f4421b4e35592648510c877ecf55b1af2b96dcee"><strong>compiler/GHC/Core/Opt/WorkWrap/Utils.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">@@ -40,12 +40,14 @@ import GHC.Core.Coercion</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Boxity</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Map</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupTypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTypeMap</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Supply</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.TrieMap</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.List.SetOps</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"></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">@@ -1001,30 +1003,47 @@ findTypeShape :: FamInstEnvs -> Type -> TypeShape</td>
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1001
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The data type TypeShape is defined in GHC.Types.Demand</span></span>
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1002
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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Trimming a demand to a type] in GHC.Core.Opt.DmdAnal</span></span>
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1003
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1005
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">findTypeShape</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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1004
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<pre style="margin: 0;">-<span id="LC1004" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">initRecTc</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- You might think this bound of 2 is low, but actually</span></span>
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1006
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<pre style="margin: 0;">-<span id="LC1006" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- I think even 1 would be fine. This only bites for recursive</span></span>
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1007
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<pre style="margin: 0;">-<span id="LC1007" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- product types, which are rare, and we really don't want</span></span>
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1008
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to look deep into such products -- see #18034</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">emptyTM</span> <span class="n" style="color: #333;">ty</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We keep track of types we have seen to avoid looking deep</span></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- into recursive types -- see #18304.</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The solution is simple. If a type is recursive one of it's</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- fields will eventually mention it's outermost type.</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So we check for this using TypeMap.</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TypeMap isn't ideal for this. It covers types we will never</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see here, and it wastes space as it's a map used as set.</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This makes this somewhat more expensive (~0.1 allocations)</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- than using checkRecTc. But it's more precise as things like</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deeply nested tuples won't bail out early so still desireable.</span></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Implementing a typeset suitable for this use could increase</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- performance further if this ever becomes a bottleneck.</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"></span>
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1009
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1010
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<pre style="margin: 0;">-<span id="LC1010" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">ty</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"> <span class="n" style="color: #333;">prodFieldShape</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeMap</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span></span>
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1026
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<pre style="margin: 0;">+<span id="LC1026" class="line" lang="haskell"> <span class="n" style="color: #333;">prodFieldShape</span> <span class="n" style="color: #333;">tyMap</span> <span class="n" style="color: #333;">origTy</span> <span class="n" style="color: #333;">fldTy</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupTypeMap</span> <span class="n" style="color: #333;">tyMap'</span> <span class="n" style="color: #333;">fldTy</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsRecField</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tyMap'</span> <span class="n" style="color: #333;">fldTy</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1031" 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">
1031
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<pre style="margin: 0;">+<span id="LC1031" 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="1032" 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">
1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"> <span class="n" style="color: #333;">tyMap'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTypeMap</span> <span class="n" style="color: #333;">tyMap</span> <span class="n" style="color: #333;">origTy</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1033" 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">
1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tyMap</span> <span class="n" style="color: #333;">ty</span></span>
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1011
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<td class="diff-line-num new_line" data-linenumber="1034" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1012" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1012
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<td class="diff-line-num new_line old" data-linenumber="1035" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_tc</span></span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1013" 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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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">tyMap</span></span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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1013
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<td class="diff-line-num new_line" data-linenumber="1036" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"></span>
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<td class="diff-line-num new old_line" data-linenumber="1014" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1037" 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">
1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Product types</span></span>
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1014
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<td class="diff-line-num new_line" data-linenumber="1038" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1015
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<td class="diff-line-num new_line" data-linenumber="1039" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">con</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isDataProductTyCon_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_tc</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_tc</span> <span class="n" style="color: #333;">tc</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We treat tuples specially because they can't cause loops.</span></span>
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1020
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Maybe we should do so in checkRecTc.</span></span>
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1021
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<pre style="margin: 0;">-<span id="LC1021" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">rec_tc</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dataConInstArgTys</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tc_args</span><span class="p">))</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">prodFieldShape</span> <span class="n" style="color: #333;">tyMap</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">dataConInstArgTys</span> <span class="n" style="color: #333;">con</span> <span class="n" style="color: #333;">tc_args</span><span class="p">))</span></span>
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1022
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"></span>
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1023
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitForAllTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_tc</span></span> <span class="n" style="color: #333;">ty'</span></span>
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">tyMap</span></span> <span class="n" style="color: #333;">ty'</span></span>
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"></span>
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1045
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topNormaliseType_maybe</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC1027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">rec_tc</span></span> <span class="n" style="color: #333;">ty'</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;"><span class="idiff left right">tyMap</span></span> <span class="n" style="color: #333;">ty'</span></span>
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"></span>
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsUnk</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a29762d494ef8ee99caaf7792398923e566a32a#d09e98aae6ad2eb59d08eac7894b68c0ab820cda"><strong>compiler/GHC/Types/Demand.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">@@ -833,6 +833,8 @@ data TypeShape -- See Note [Trimming a demand to a type]</td>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Opt.DmdAnal</span></span>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span></span>
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TypeShape</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TsRecField</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ A field which refers to a type it's a part of.</span></span>
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. the second field in data T = MkT Int T</span></span>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TsUnk</span></span>
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"><span class="n" style="color: #333;">trimToType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Demand</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Demand</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">@@ -864,6 +866,7 @@ trimToType (JD { sd = ms, ud = mu }) ts</td>
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"></span>
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865
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TypeShape</span> <span class="kr" style="font-weight: 600;">where</span></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">TsUnk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TsUnk"</span></span>
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">TsRecField</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TsRecField"</span></span>
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867
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsFun</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"TsFun"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ts</span><span class="p">)</span></span>
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868
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TsProd</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">hsep</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">punctuate</span> <span class="n" style="color: #333;">comma</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tss</span><span class="p">)</span></span>
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869
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872
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"></span>
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