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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078">df021fb1</a></strong>
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<span>by Baldur Blöndal</span>
<i>at 2020-05-13T20:06:06-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document (->) using inferred quantification for its runtime representations.
Fixes #18142.
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#8a5cd068459120cddf3814e7b9e02003b87647ba">
compiler/GHC/Builtin/Types/Prim.hs
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<li class="file-stats">
<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<h4>Changes:</h4>
<li id="8a5cd068459120cddf3814e7b9e02003b87647ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078#8a5cd068459120cddf3814e7b9e02003b87647ba"><strong>compiler/GHC/Builtin/Types/Prim.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">@@ -399,9 +399,23 @@ funTyConName = mkPrimTyConName (fsLit "->") funTyConKey funTyCon</td>
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399
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399
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"><span class="cd">-- | The @(->)@ type constructor.</span></span>
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400
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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401
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401
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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402
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (->) :: forall <span class="idiff left right">(rep1 :: RuntimeRep) (rep2 :: RuntimeRep)</span>.</span></span>
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403
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<pre style="margin: 0;">-<span id="LC403" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE rep1 -> TYPE rep2 -> <span class="idiff left right">*</span></span></span>
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (->) :: forall <span class="idiff left right">{rep1 :: RuntimeRep} {rep2 :: RuntimeRep}</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE rep1 -> TYPE rep2 -> <span class="idiff left right">Type</span></span></span>
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<pre style="margin: 0;"> <span id="LC404" 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="LC405" 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="LC406" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The runtime representations quantification is left inferred. This</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- means they cannot be specified with @-XTypeApplications@.</span></span>
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<pre style="margin: 0;">+<span id="LC408" 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="LC409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is a deliberate choice to allow future extensions to the</span></span>
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<pre style="margin: 0;">+<span id="LC410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function arrow. To allow visible application a type synonym can be</span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- defined:</span></span>
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<pre style="margin: 0;">+<span id="LC412" 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="LC413" 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="LC414" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type Arr :: forall (rep1 :: RuntimeRep) (rep2 :: RuntimeRep).</span></span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TYPE rep1 -> TYPE rep2 -> Type</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type Arr = (->)</span></span>
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<pre style="margin: 0;">+<span id="LC417" 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="LC418" 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="LC419" class="line" lang="haskell"><span class="n" style="color: #333;">funTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"><span class="n" style="color: #333;">funTyCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFunTyCon</span> <span class="n" style="color: #333;">funTyConName</span> <span class="n" style="color: #333;">tc_bndrs</span> <span class="n" style="color: #333;">tc_rep_nm</span></span>
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<pre style="margin: 0;"> <span id="LC421" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.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">@@ -292,7 +292,9 @@ tidyCoAxBndrsForUser init_env tcvs</td>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Function coercions]</span></span>
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<pre style="margin: 0;"> <span id="LC293" 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="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Remember that</span></span>
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (->) :: forall r1 r2. TYPE r1 -> TYPE r2 -> TYPE LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (->) :: forall {r1} {r2}. TYPE r1 -> TYPE r2 -> TYPE LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">whose `RuntimeRep' arguments are intentionally marked inferred to</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">avoid type application.</span></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> FunCo r co1 co2 :: (s1->t1) ~r (s2->t2)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.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">@@ -255,12 +255,15 @@ about it!</td>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* FFunTy is the data constructor, meaning "full function type".</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The function type constructor (->) has kind</span></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (->) :: forall <span class="idiff left right">r1 r2</span>. TYPE r1 -> TYPE r2 -> Type LiftedRep</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (->) :: forall <span class="idiff left right">{r1} {r2}</span>. TYPE r1 -> TYPE r2 -> Type LiftedRep</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mkTyConApp ensure that we convert a saturated application</span></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TyConApp (->) [r1,r2,t1,t2] into FunTy t1 t2</span></span>
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261
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dropping the 'r1' and 'r2' arguments; they are easily recovered</span></span>
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262
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262
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from 't1' and 't2'.</span></span>
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263
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263
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For the time being its RuntimeRep quantifiers are left</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inferred. This is to allow for it to evolve.</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"></span>
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264
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267
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<pre style="margin: 0;"> <span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The ft_af field says whether or not this is an invisible argument</span></span>
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265
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> VisArg: t1 -> t2 Ordinary function type</span></span>
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266
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> InvisArg: t1 => t2 t1 is guaranteed to be a predicate type,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df021fb15bcef313f30e772997bcb263c8f34078#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/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">@@ -1012,9 +1012,10 @@ Note [Representation of function types]</td>
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1012
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1013
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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="cm" style="color: #998; font-style: italic;">Functions (e.g. Int -> Char) can be thought of as being applications</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of funTyCon (known in Haskell surface syntax as (->)),</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of funTyCon (known in Haskell surface syntax as (->)), (note that</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`RuntimeRep' quantifiers are left inferred)</span></span>
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1016
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1017
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<pre style="margin: 0;"> <span id="LC1017" 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="cm" style="color: #998; font-style: italic;"> (->) :: forall <span class="idiff left right">(r1 :: RuntimeRep) (r2 :: RuntimeRep)</span></span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (->) :: forall <span class="idiff left right">{r1 :: RuntimeRep} {r2 :: RuntimeRep}</span></span></span>
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1018
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a :: TYPE r1) (b :: TYPE r2).</span></span>
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1019
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a -> b -> Type</span></span>
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1020
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"></span>
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