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<h3>
Ryan Scott pushed to branch wip/T18660
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/e37bd14b85c86eca48345beeb1dc94cdf6bb1327">e37bd14b</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-09-07T19:06:32-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make the forall-or-nothing rule only apply to invisible foralls (#18660)
This fixes #18660 by changing `isLHsForAllTy` to
`isLHsInvisForAllTy`, which is sufficient to make the
`forall`-or-nothing rule only apply to invisible `forall`s. I also
updated some related documentation and Notes while I was in the
neighborhood.
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<li class="file-stats">
<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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<li class="file-stats">
<a href="#afd1105d8e32dc50acf9fc381b4433a3bcd009cf">
docs/users_guide/exts/explicit_forall.rst
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<li class="file-stats">
<a href="#ae76e7fa8ac75301abfd2681383fda5aa26d1d41">
<span class="new-file">
+
testsuite/tests/dependent/should_compile/T18660.hs
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<li class="file-stats">
<a href="#a4ff33ccde330caaa403f371defa5ddc5ad10c84">
testsuite/tests/dependent/should_compile/all.T
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<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37bd14b85c86eca48345beeb1dc94cdf6bb1327#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/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">@@ -61,7 +61,7 @@ module GHC.Hs.Type (</td>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkEmptyImplicitBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkEmptyWildCardBndrs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsForAllVisTele</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkHsForAllInvisTele</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHsQTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsQTvExplicit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyLHsQTvs</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isHsKindedTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsTvbAllKinded</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isLHsForAllTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isHsKindedTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsTvbAllKinded</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isLHs<span class="idiff left right">Invis</span>ForAllTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsScopedTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsWcScopedTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">dropWildCards</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsTyVarName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsAllLTyVarNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarLocNames</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarNames</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsLTyVarLocName</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hsExplicitLTyVarNames</span><span class="p">,</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">@@ -1278,9 +1278,12 @@ ignoreParens :: LHsType (GhcPass p) -> LHsType (GhcPass p)</td>
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"><span class="n" style="color: #333;">ignoreParens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsParTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1279" class="line" lang="haskell"><span class="n" style="color: #333;">ignoreParens</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1282
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<pre style="margin: 0;">-<span id="LC1282" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span> <span class="p">{}))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"><span class="cd">-- | Is this type headed by an invisible @forall@? This is used to determine</span></span>
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<pre style="margin: 0;">+<span id="LC1282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if the type variables in a type should be implicitly quantified.</span></span>
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [forall-or-nothing rule]@ in "GHC.Rename.HsType".</span></span>
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<pre style="margin: 0;">+<span id="LC1284" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsInvisForAllTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsInvisForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsForAllTy</span><span class="p">{</span><span class="n" style="color: #333;">hst_tele</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HsForAllInvis</span><span class="p">{}}))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1286
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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"><span class="n" style="color: #333;">isLHsInvisForAllTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"></span>
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1288
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<pre style="margin: 0;"> <span id="LC1288" 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="LC1289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<li id="892acbb198a9095c917740d3c1297b56df4e3b7e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37bd14b85c86eca48345beeb1dc94cdf6bb1327#892acbb198a9095c917740d3c1297b56df4e3b7e"><strong>compiler/GHC/Rename/HsType.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">@@ -168,7 +168,7 @@ rn_hs_sig_wc_type scoping ctxt hs_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nubL</span> <span class="n" style="color: #333;">nwc_rdrs'</span></span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scoping</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AlwaysBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindUnlessForall</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHs<span class="idiff left right">Invis</span>ForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">tv_rdrs</span></span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NeverBind</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="kt" style="color: #458; font-weight: 600;">[]</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;">rnImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">implicit_bndrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></span></span>
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">hs_ty'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnWcBody</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">nwc_rdrs</span> <span class="n" style="color: #333;">hs_ty</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">@@ -321,7 +321,7 @@ rnHsSigType :: HsDocContext</td>
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321
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"><span class="n" style="color: #333;">rnHsSigType</span> <span class="n" style="color: #333;">ctx</span> <span class="n" style="color: #333;">level</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC322" 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;">traceRn</span> <span class="s" style="color: #d14;">"rnHsSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLocalRdrEnv</span></span>
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<pre style="margin: 0;">-<span id="LC324" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHsForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">forAllOrNothing</span> <span class="p">(</span><span class="n" style="color: #333;">isLHs<span class="idiff left right">Invis</span>ForAllTy</span> <span class="n" style="color: #333;">hs_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">filterInScope</span> <span class="n" style="color: #333;">rdr_env</span></span>
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">extractHsTyRdrTyVars</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rnImplicitBndrs</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">vars0</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">vars</span> <span class="o" style="font-weight: 600;">-></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">@@ -331,17 +331,43 @@ rnHsSigType ctx level (HsIB { hsib_body = hs_ty })</td>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">body'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fvs</span> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC334" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [forall-or-nothing rule]</span></span>
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<pre style="margin: 0;">-<span id="LC335" 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="LC336" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Free variables in signatures are usually bound in an implicit</span></span>
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<pre style="margin: 0;">-<span id="LC337" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'forall' at the beginning of user-written signatures. However, if the</span></span>
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<pre style="margin: 0;">-<span id="LC338" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- signature has an explicit forall at the beginning, this is disabled.</span></span>
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<pre style="margin: 0;">-<span id="LC339" 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="LC340" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The idea is nested foralls express something which is only</span></span>
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<pre style="margin: 0;">-<span id="LC341" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expressible explicitly, while a top level forall could (usually) be</span></span>
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<pre style="margin: 0;">-<span id="LC342" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- replaced with an implicit binding. Top-level foralls alone ("forall.") are</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- therefore an indication that the user is trying to be fastidious, so</span></span>
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<pre style="margin: 0;">-<span id="LC344" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we don't implicitly bind any variables.</span></span>
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<pre style="margin: 0;">+<span id="LC334" 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="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [forall-or-nothing rule]</span></span>
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<pre style="margin: 0;">+<span id="LC336" 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="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Free variables in signatures are usually bound in an implicit 'forall' at the</span></span>
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338
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">beginning of user-written signatures. However, if the signature has an</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explicit, invisible forall at the beginning, this is disabled.</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The idea is nested foralls express something which is only expressible</span></span>
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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explicitly, while a top level forall could (usually) be replaced with an</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicit binding. Top-level foralls alone ("forall.") are therefore an</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">indication that the user is trying to be fastidious, so we don't implicitly</span></span>
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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bind any variables.</span></span>
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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that this rule only applies to outermost /in/visible 'forall's, and not</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">outermost visible 'forall's. See #18660 for more on this point.</span></span>
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349
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here are some concrete examples to demonstrate the forall-or-nothing rule in</span></span>
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351
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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">action:</span></span>
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352
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F1 :: a -> b -> b -- Legal; a,b are implicitly quantified.</span></span>
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354
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Equivalently: forall a b. a -> b -> b</span></span>
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355
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F2 :: forall a b. a -> b -> b -- Legal; explicitly quantified</span></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F3 :: forall a. a -> b -> b -- Illegal; the forall-or-nothing rule says that</span></span>
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359
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- if you quantify a, you must also quantify b</span></span>
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360
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F4 :: forall a -> b -> b -- Legal; the top quantifier (forall a) is a /visible/</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- quantifer, so the "nothing" part of the forall-or-nothing</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- rule applies, and b is therefore implicitly quantified.</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Equivalently: forall b. forall a -> b -> b</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F5 :: forall b. forall a -> b -> c -- Illegal; the forall-or-nothing rule says that</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- if you quantify b, you must also quantify c</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F6 :: forall a -> forall b. b -> c -- Legal: just like F4.</span></span>
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<pre style="margin: 0;">+<span id="LC370" 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="LC371" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"><span class="cd">-- | See @Note [forall-or-nothing rule]@. This tiny little function is used</span></span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (rather than its small body inlined) to indicate that we are implementing</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">@@ -56,30 +56,32 @@ The ``forall``-or-nothing rule</td>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">In certain forms of types, type variables obey what is known as the</span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext">"``forall``-or-nothing" rule: if a type has an outermost, explicit</span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext"><span class="idiff left right">``forall``, then all of the type variables in the type must be explicitly</span></span>
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<pre style="margin: 0;">-<span id="LC61" class="line" lang="plaintext">quantified. These two examples illustrate how the rule works: ::</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">"``forall``-or-nothing" rule: if a type has an outermost, explicit<span class="idiff left right">,</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext"><span class="idiff left right">invisible ``forall``, then all of the type variables in the type must be</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext"><span class="idiff left right">explicitly </span>quantified. These two examples illustrate how the rule works: ::</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext"> f :: forall a b. a -> b -> b -- OK, `a` and `b` are explicitly bound</span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"> g :: forall a. a -> forall b. b -> b -- OK, `a` and `b` are explicitly bound</span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="plaintext"> h :: forall a. a -> b -> b -- Rejected, `b` is not in scope</span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">The type signatures for ``f``, ``g``, and ``h`` all begin with an outermost</span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext"><span class="idiff left right">``forall``, so every type variable in these signatures must be explicitly</span></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext"><span class="idiff left right">bound by a ``forall``. Both ``f`` and ``g`` obey the ``forall``-or-nothing</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext"><span class="idiff left right">rule, since they explicitly quantify ``a`` and ``b``. On the other hand,</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext"><span class="idiff left right">``h`` does not explicitly quantify ``b``, so GHC will reject its type</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="plaintext">signature for being improperly scoped.</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"><span class="idiff left right">invisible ``forall``, so every type variable in these signatures must be</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext"><span class="idiff left right">explicitly bound by a ``forall``. Both ``f`` and ``g`` obey the</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext"><span class="idiff left right">``forall``-or-nothing rule, since they explicitly quantify ``a`` and ``b``. On</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext"><span class="idiff left right">the other hand, ``h`` does not explicitly quantify ``b``, so GHC will reject</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext"><span class="idiff left right">its type </span>signature for being improperly scoped.</span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="plaintext">In places where the ``forall``-or-nothing rule takes effect, if a type does</span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="plaintext">*not* have an outermost <span class="idiff left right">``forall``, then any type variables that are not</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="plaintext">explicitly bound by a ``forall`` become implicitly quantified. For example: ::</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">*not* have an outermost <span class="idiff left right">invisible ``forall``, then any type variables that are</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"><span class="idiff left right">not </span>explicitly bound by a ``forall`` become implicitly quantified. For example: ::</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext"> i :: a -> b -> b -- `a` and `b` are implicitly quantified</span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext"> j :: a -> forall b. b -> b -- `a` is implicitly quantified</span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext"> k :: (forall a. a -> b -> b) -- `b` is implicitly quantified</span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext"> type L :: forall a -> b -> b -- `b` is implicitly quantified</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="plaintext">GHC will accept ``i``, ``j``, and ``k``'s type signatures. Note that:</span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="plaintext">GHC will accept ``i``, ``j``, and ``k``'s type signatures, as well as ``L``'s</span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext">kind signature. Note that:</span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="plaintext">- ``j``'s signature is accepted despite its mixture of implicit and explicit</span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext"> quantification. As long as a ``forall`` is not an outermost one, it is fine</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">@@ -88,6 +90,9 @@ GHC will accept ``i``, ``j``, and ``k``'s type signatures. Note that:</td>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"> the ``forall`` is not an outermost ``forall``. The ``forall``-or-nothing</span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext"> rule is one of the few places in GHC where the presence or absence of</span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext"> parentheses can be semantically significant!</span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext">- ``L``'s signature begins with an outermost ``forall``, but it is a *visible*</span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext"> ``forall``, not an invisible ``forall``, and therefore does not trigger the</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext"> ``forall``-or-nothing rule.</span>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="plaintext">The ``forall``-or-nothing rule takes effect in the following places:</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37bd14b85c86eca48345beeb1dc94cdf6bb1327#ae76e7fa8ac75301abfd2681383fda5aa26d1d41"><strong>testsuite/tests/dependent/should_compile/T18660.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE StandaloneKindSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18660</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37bd14b85c86eca48345beeb1dc94cdf6bb1327#a4ff33ccde330caaa403f371defa5ddc5ad10c84"><strong>testsuite/tests/dependent/should_compile/all.T</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">@@ -66,3 +66,4 @@ test('T16326_Compile2', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16391a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16344b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<td class="diff-line-num old_line" data-linenumber="68" 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">
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16347</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18660</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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