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<h3>
Simon Peyton Jones pushed to branch wip/T17775
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c1f41cefa7d8d69c3de95d7bbf52466c9511584">9c1f41ce</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-24T15:42:26+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8095fb16c3d98a4a1d3165d82ac0f2af689481dd">8095fb16</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-24T15:43:26+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Get the right version of Haddock
(Thanks Ryan.)
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<h4>2 changed files:</h4>
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#46ddb8dda2edd2df4717a3285e83997fc812a347">
utils/haddock
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<h4>Changes:</h4>
<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f767c28518319c471f432c2f45fe6661bf2d255e...8095fb16c3d98a4a1d3165d82ac0f2af689481dd#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -160,17 +160,19 @@ simplifyTop wanteds</td>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- should generally bump the TcLevel to make sure that this run of the solver</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- doesn't affect anything lying around.</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <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 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="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Failure in local type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualities</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC165" 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="p">(</span><span class="n" style="color: #333;">wanted</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;">solveLocalEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFlatConstraints</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"><span class="n" style="color: #333;">emitFlatConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">emitFlatConstraints</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC172" 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;">wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">zonkWC</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">floatKindEqualities</span> <span class="n" style="color: #333;">wanted</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="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;">"emitFlatConstraints: failing"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">wanted</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- So they get reported!</span></span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">failM</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">simple_wanteds</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTyVarSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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178
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfCts</span> <span class="n" style="color: #333;">simple_wanteds</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">@@ -201,10 +203,11 @@ floatKindEqualities wc = float_wc emptyVarSet wc</td>
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201
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- A short cut /plus/ we must keep track of IC_BadTelescope</span></span>
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202
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204
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<pre style="margin: 0;"> <span id="LC204" 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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203
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205
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<pre style="margin: 0;"> <span id="LC205" 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;">cts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">new_trapping_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">ic_wanted</span> <span class="n" style="color: #333;">imp</span><span class="p">)</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">unless</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isEmptyBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">||</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ic_no_eqs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">imp</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">when</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isEmptyBag</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cts</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ic_no_eqs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">imp</span></span><span class="p"><span class="idiff right">)</span>)</span> <span class="o" style="font-weight: 600;">$</span></span>
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205
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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206
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't float out past local equalities</span></span>
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207
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- C.f GHC.Tc.Solver.approximateWC</span></span>
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208
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If there are some constraints to float out, but we can't</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because we don't float out past local equalities</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (c.f GHC.Tc.Solver.approximateWC), then fail</span></span>
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208
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">cts</span> <span class="p">}</span></span>
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209
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212
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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210
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"> <span class="n" style="color: #333;">new_trapping_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">trapping_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">ic_skols</span> <span class="n" style="color: #333;">imp</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">@@ -215,7 +218,7 @@ floatKindEqualities wc = float_wc emptyVarSet wc</td>
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215
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218
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When kind checking a type signature, we like to fail fast if we can't</span></span>
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216
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solve all the kind equality constraints: see Note [Fail fast on kind</span></span>
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217
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">errors]. But what about /local/ type signatures, mentioning in-scope</span></span>
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218
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type var<span class="idiff left right">ai</span>bles for which there might be given equalities. Here's</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type var<span class="idiff left right">ia</span>bles for which there might be given equalities. Here's</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">an example (T15076b):</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class (a ~ b) => C a b</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">@@ -275,7 +278,7 @@ So here's the plan:</td>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Note that this float-and-promote step means that anonymous</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wildcards get floated to top level, as we want; see</span></span>
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<pre style="margin: 0;">-<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Checking partial type signatures] in GHC.Tc.Ge<span class="idiff left right">h</span>.HsType.</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Checking partial type signatures] in GHC.Tc.Ge<span class="idiff left right">n</span>.HsType.</span></span>
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<pre style="margin: 0;"> <span id="LC282" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All this is done:</span></span>
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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-Subproject commit <span class="idiff left right">5ec817a3e41b7eaa50c74701ab2d7642df86464c</span></pre>
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<pre style="margin: 0;">+Subproject commit <span class="idiff left right">20bf93490b37c0410d85a0ad4d38f9ddc2253589</span></pre>
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