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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/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb">6c7a5c0c</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-20T00:48:29-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor comments, update linear types docs
- Update comments: placeHolderTypeTc no longer exists
"another level check problem" was a temporary comment from linear types
- Use Mult type synonym (reported in #18676)
- Mention multiplicity-polymorphic fields in linear types docs
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<h4>5 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="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a">
compiler/GHC/Hs/Utils.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<a href="#228f7530ac2289de7848ad95774f7aa4673c4431">
docs/users_guide/exts/linear_types.rst
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<h4>Changes:</h4>
<li id="8a5cd068459120cddf3814e7b9e02003b87647ba">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb#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">@@ -423,7 +423,7 @@ funTyConName = mkPrimTyConName (fsLit "FUN") funTyConKey funTyCon</td>
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423
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423
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<pre style="margin: 0;"> <span id="LC423" 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="LC424" 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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425
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<pre style="margin: 0;"> <span id="LC425" 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="LC426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type Arr = FUN</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type Arr = FUN<span class="idiff left right"> 'Many</span></span></span>
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427
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427
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<pre style="margin: 0;"> <span id="LC427" 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="LC428" 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="LC429" 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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<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1119" 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="1119" 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">@@ -1119,14 +1119,14 @@ In the compiler we maintain the invariant that all saturated applications of</td>
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1119
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<pre style="margin: 0;"> <span id="LC1119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See #11714.</span></span>
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<pre style="margin: 0;"> <span id="LC1120" 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="LC1121" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1122" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Type</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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1123
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Attempts to extract the <span class="idiff left right">argument and result types from a type, and</span></span></span>
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1124
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<pre style="margin: 0;">-<span id="LC1124" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- panics if that is not possible. See also 'splitFunTy_maybe'</span></span>
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<pre style="margin: 0;">+<span id="LC1122" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy</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="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Mult</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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1123
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<pre style="margin: 0;">+<span id="LC1123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Attempts to extract the <span class="idiff left right">multiplicity, argument and result types from a type,</span></span></span>
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<pre style="margin: 0;">+<span id="LC1124" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">and </span>panics if that is not possible. See also 'splitFunTy_maybe'</span></span>
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<pre style="margin: 0;"> <span id="LC1125" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">expectJust</span> <span class="s" style="color: #d14;">"splitFunTy"</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">splitFunTy_maybe</span></span>
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE splitFunTy_maybe #-}</span></span>
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<pre style="margin: 0;">-<span id="LC1128" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy_maybe</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;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Type</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Attempts to extract the argument and result types from a type</span></span>
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy_maybe</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;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Mult</span></span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Attempts to extract the <span class="idiff left right">multiplicity, </span>argument and result types from a type</span></span>
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"><span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1131" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreFullView</span> <span class="n" style="color: #333;">ty</span> <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;">w</span><span class="p">,</span> <span class="n" style="color: #333;">arg</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a"><strong>compiler/GHC/Hs/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">@@ -351,9 +351,10 @@ mkPsBindStmt pat body = BindStmt noExtField pat body</td>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="haskell"><span class="n" style="color: #333;">mkRnBindStmt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XBindStmtRn</span> <span class="p">{</span> <span class="n" style="color: #333;">xbsrn_bindOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noSyntaxExpr</span><span class="p">,</span> <span class="n" style="color: #333;">xbsrn_failOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">})</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcBindStmt</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XBindStmtTc</span> <span class="p">{</span> <span class="n" style="color: #333;">xbstc_bindOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noSyntaxExpr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="haskell"> <span class="n" style="color: #333;">xbstc_boundResultType</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unitTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unitTy is a dummy value</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- can't panic here: it's forced during zonking</span></span>
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<pre style="margin: 0;"> <span id="LC356" class="line" lang="haskell"> <span class="n" style="color: #333;">xbstc_boundResultMult</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC357" class="line" lang="haskell"> <span class="n" style="color: #333;">xbstc_failOp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">})</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">body</span></span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't use placeHolderTypeTc above, because that panics during zonking</span></span>
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRecStmt'</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">idL</span> <span class="n" style="color: #333;">idR</span> <span class="n" style="color: #333;">body</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">IsPass</span> <span class="n" style="color: #333;">idR</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">XRecStmt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">idL</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">idR</span><span class="p">)</span> <span class="n" style="color: #333;">body</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.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">@@ -999,7 +999,6 @@ writeMetaTyVarRef tyvar ref ty</td>
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<pre style="margin: 0;"> <span id="LC999" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check for level OK</span></span>
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1000
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Level check when unifying]</span></span>
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">level_check_ok</span><span class="p">,</span> <span class="n" style="color: #333;">level_check_msg</span> <span class="p">)</span></span>
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1002
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- another level check problem, see #97</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"></span>
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1004
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check Kinds ok</span></span>
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">kind_check_ok</span><span class="p">,</span> <span class="n" style="color: #333;">kind_msg</span> <span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb#228f7530ac2289de7848ad95774f7aa4673c4431"><strong>docs/users_guide/exts/linear_types.rst</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">@@ -101,13 +101,23 @@ Whether a data constructor field is linear or not can be customized using the GA</td>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext">::</span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext"> data T2 a b c where</span>
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="plaintext"> MkT2 :: a -> b %1 -> c %1 -> T2 a b -- Note unrestricted arrow in the first argument</span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext"> MkT2 :: a -> b %1 -> c %1 -> T2 a b <span class="idiff left right">c</span> -- Note unrestricted arrow in the first argument</span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="plaintext">the value ``MkT2 x y z`` can be constructed only if ``x`` is</span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="plaintext">unrestricted. On the other hand, a linear function which is matching</span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="plaintext">on ``MkT2 x y z`` must consume ``y`` and ``z`` exactly once, but there</span>
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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="plaintext">is no restriction on ``x``.</span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">It is also possible to define a multiplicity-polymorphic field:</span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext">::</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"> data T3 a m where</span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> MkT3 :: a %m -> T3 a m</span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"></span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext">While linear fields are generalized (``MkT1 :: forall {m} a. a %m -> T1 a``</span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext">in the previous example), multiplicity-polymorphic fields are not;</span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext">it is not possible to directly use ``MkT3`` as a function ``a -> T3 a 'One``.</span>
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120
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext"></span>
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111
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext">If :extension:`LinearTypes` is disabled, all fields are considered to be linear</span>
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112
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext">fields, including GADT fields defined with the ``->`` arrow.</span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext"></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">@@ -143,9 +153,9 @@ missing pieces.</td>
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext"> have success using it, or you may not. Expect it to be really unreliable.</span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="plaintext">- There is currently no support for multiplicity annotations such as</span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="plaintext"> ``x :: a %p``, ``\(x :: a %p) -> ...``.</span>
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146
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="plaintext">- All ``case``<span class="idiff left right">, ``let`` and ``where`` statements consume their</span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="plaintext"> <span class="idiff left right">right-hand side, or scrutiny, ``Many`` times. That is, the following</span></span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="plaintext"> will not type check:</span>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext">- All ``case``<span class="idiff left right"> expressions consume their scrutinee ``Many`` times.</span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="plaintext"> <span class="idiff left right">All ``let`` and ``where`` statements consume their right hand side</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext"> <span class="idiff left right">``Many`` times. That is, the following </span>will not type check:</span>
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159
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="plaintext"> ::</span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="plaintext"></span>
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