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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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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bcf86063c0e5b6ee0d162ea64c88fdaad89e620">5bcf8606</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-05-17T08:46:38-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove duplicate Note [When to print foralls] in GHC.Core.TyCo.Ppr
There are two different Notes named `[When to print foralls]`. The
most up-to-date one is in `GHC.Iface.Type`, but there is a second
one in `GHC.Core.TyCo.Ppr`. The latter is less up-to-date, as it was
written before GHC switched over to using ifaces to pretty-print
types. I decided to just remove the latter and replace it with a
reference to the former.
[ci skip]
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#379343fa560df0c7451aa5a1dd4f074dd37924d0">
compiler/GHC/Core/TyCo/Ppr.hs
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<h4>Changes:</h4>
<li id="379343fa560df0c7451aa5a1dd4f074dd37924d0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bcf86063c0e5b6ee0d162ea64c88fdaad89e620#379343fa560df0c7451aa5a1dd4f074dd37924d0"><strong>compiler/GHC/Core/TyCo/Ppr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="171" 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="diff-line-num unfold js-unfold new_line" data-linenumber="171" 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">@@ -171,7 +171,8 @@ pprSigmaType = pprIfaceSigmaType ShowForAllWhen . tidyToIfaceType</td>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"><span class="n" style="color: #333;">pprForAll</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</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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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">pprForAll</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprIfaceForAll</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toIfaceForAllBndr</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cd">-- | Print a user-level forall; see Note [When to print foralls] in this module.</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cd">-- | Print a user-level forall; see @Note [When to print foralls]@ in</span></span>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Iface.Type".</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserForAll</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</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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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">pprUserForAll</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprUserIfaceForAll</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">toIfaceForAllBndr</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="253" 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="diff-line-num unfold js-unfold new_line" data-linenumber="254" 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">@@ -253,24 +254,6 @@ debug_ppr_ty prec ty@(ForAllTy {})</td>
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"> <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;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC256" 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="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [When to print foralls]</span></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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Mostly we want to print top-level foralls when (and only when) the user specifies</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;">-fprint-explicit-foralls. But when kind polymorphism is at work, that suppresses</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;">too much information; see #9018.</span></span>
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<pre style="margin: 0;">-<span id="LC261" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So I'm trying out this rule: print explicit foralls if</span></span>
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<pre style="margin: 0;">-<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) User specifies -fprint-explicit-foralls, or</span></span>
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<td class="diff-line-num old old_line" data-linenumber="264" 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="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) Any of the quantified type variables has a kind</span></span>
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<td class="diff-line-num old old_line" data-linenumber="265" 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="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that mentions a kind variable</span></span>
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<pre style="margin: 0;">-<span id="LC266" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="267" 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="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This catches common situations, such as a type siguature</span></span>
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<pre style="margin: 0;">-<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: m a</span></span>
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<pre style="margin: 0;">-<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which means</span></span>
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<pre style="margin: 0;">-<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall k. forall (m :: k->*) (a :: k). m a</span></span>
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<pre style="margin: 0;">-<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We really want to see both the "forall k" and the kind signatures</span></span>
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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on m and a. The latter comes from pprTCvBndr.</span></span>
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<pre style="margin: 0;">-<span id="LC273" 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;">Note [Infix type variables]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">With TypeOperators you can say</span></span>
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