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<h3>
Vladislav Zavialov pushed to branch wip/t18522-b
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/fdd1d02bf3a5a2a2e80b9717957883d561a5bdd9">fdd1d02b</a></strong>
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<span>by Vladislav Zavialov</span>
<i>at 2020-08-04T22:34:42+03:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix visible forall in ppr_ty (#18522)
Before this patch, this type:
T :: forall k -> (k ~ k) => forall j -> k -> j -> Type
was printed incorrectly as:
T :: forall k j -> (k ~ k) => k -> j -> Type
</pre>
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#f2b2b84d138b362920ab9f144f58bf16254aab64">
compiler/GHC/Iface/Type.hs
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<a href="#62acbc236d9cbfd951174fd4f8b073a92feda575">
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+
testsuite/tests/polykinds/T18522-ppr.script
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+
testsuite/tests/polykinds/T18522-ppr.stdout
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<li class="file-stats">
<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">
testsuite/tests/polykinds/all.T
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<h4>Changes:</h4>
<li id="f2b2b84d138b362920ab9f144f58bf16254aab64">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdd1d02bf3a5a2a2e80b9717957883d561a5bdd9#f2b2b84d138b362920ab9f144f58bf16254aab64"><strong>compiler/GHC/Iface/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">@@ -441,6 +441,7 @@ splitIfaceSigmaTy ty</td>
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441
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">rho</span></span>
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442
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442
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"></span>
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443
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"> <span class="n" style="color: #333;">split_foralls</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceForAllTy</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="p">(</span><span class="n" style="color: #333;">binderArgFlag</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">split_foralls</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"> <span class="n" style="color: #333;">split_foralls</span> <span class="n" style="color: #333;">rho</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>
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447
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="449" 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">@@ -448,6 +449,12 @@ splitIfaceSigmaTy ty</td>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">ty2</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ps</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">ty1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">ps</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="haskell"> <span class="n" style="color: #333;">split_rho</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="haskell"><span class="n" style="color: #333;">splitIfaceReqForallTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">IfaceForAllBndr</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="haskell"><span class="n" style="color: #333;">splitIfaceReqForallTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IfaceForAllTy</span> <span class="n" style="color: #333;">bndr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isVisibleArgFlag</span> <span class="p">(</span><span class="n" style="color: #333;">binderArgFlag</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">splitIfaceReqForallTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">bndr</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"><span class="n" style="color: #333;">splitIfaceReqForallTy</span> <span class="n" style="color: #333;">rho</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"><span class="n" style="color: #333;">suppressIfaceInvisibles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PrintExplicitKinds</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">IfaceTyConBinder</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="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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452
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459
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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"><span class="n" style="color: #333;">suppressIfaceInvisibles</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrintExplicitKinds</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="n" style="color: #333;">_tys</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xs</span></span>
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453
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460
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<pre style="margin: 0;"> <span id="LC460" class="line" lang="haskell"><span class="n" style="color: #333;">suppressIfaceInvisibles</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PrintExplicitKinds</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">xs</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">@@ -1184,8 +1191,23 @@ pprIfaceSigmaType show_forall ty</td>
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1184
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hideNonStandardTypes</span> <span class="n" style="color: #333;">ppr_fn</span> <span class="n" style="color: #333;">ty</span></span>
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1185
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1192
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<pre style="margin: 0;"> <span id="LC1192" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1186
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_fn</span> <span class="n" style="color: #333;">iface_ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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1187
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<pre style="margin: 0;">-<span id="LC1187" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitIfaceSigmaTy</span> <span class="n" style="color: #333;">iface_ty</span></span>
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1188
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<pre style="margin: 0;">-<span id="LC1188" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr_iface_forall_part</span> <span class="n" style="color: #333;">show_forall</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">invis_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitIfaceSigmaTy</span> <span class="n" style="color: #333;">iface_ty</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">req_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">tau'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitIfaceReqForallTy</span> <span class="n" style="color: #333;">tau</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- splitIfaceSigmaTy is recursive, so it will gather the binders after</span></span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the theta, i.e. forall a. theta => forall b. tau</span></span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will give you ([a,b], theta, tau).</span></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This isn't right when it comes to visible forall (see</span></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- testsuite/tests/polykinds/T18522-ppr),</span></span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we split off required binders separately,</span></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- using splitIfaceReqForallTy.</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- An alternative solution would be to make splitIfaceSigmaTy</span></span>
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- non-recursive (see #18458).</span></span>
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1207
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then it could handle both invisible and required binders, and</span></span>
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- splitIfaceReqForallTy wouldn't be necessary here.</span></span>
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1209
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">ppr_iface_forall_part</span> <span class="n" style="color: #333;">show_forall</span> <span class="n" style="color: #333;">invis_tvs</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">$</span></span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="haskell"> <span class="n" style="color: #333;">sep</span> <span class="p">[</span><span class="n" style="color: #333;">pprIfaceForAll</span> <span class="n" style="color: #333;">req_tvs</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tau'</span><span class="p">]</span></span>
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1189
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1211
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<pre style="margin: 0;"> <span id="LC1211" class="line" lang="haskell"></span>
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1190
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1212
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<pre style="margin: 0;"> <span id="LC1212" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserIfaceForAll</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">IfaceForAllBndr</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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1191
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<pre style="margin: 0;"> <span id="LC1213" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserIfaceForAll</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">:set -XPolyKinds -XDataKinds -XRankNTypes -XTypeFamilies</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">import Data.Kind (Type)</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">type family T :: forall k -> (k ~ k) => forall j -> k -> j -> Type</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">:k T</span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">T :: forall k -> (k ~ k) => forall j -> k -> j -> *</span></pre>
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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">@@ -223,3 +223,4 @@ test('T18300', normal, compile_fail, [''])</td>
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223
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223
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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224
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224
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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225
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225
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18451b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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226
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18522-ppr</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18522-ppr.script</span><span class="p">'])</span></span></pre>
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