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authorJohn Ericson <John.Ericson@Obsidian.Systems>2020-04-22 00:58:25 -0400
committerMarge Bot <ben+marge-bot@smart-cactus.org>2020-05-08 15:29:36 -0400
commit4e9aef9ea732e8157ee0b7fbb85b2cdfbf49de5f (patch)
tree5a41c9aca2cc0990652137128761e32e52a4286a
parent9749fe1223d182b1f8e7e4f7378df661c509f396 (diff)
downloadhaskell-4e9aef9ea732e8157ee0b7fbb85b2cdfbf49de5f.tar.gz
HsSigWcTypeScoping: Pull in documentation from stray location
-rw-r--r--compiler/GHC/Rename/HsType.hs30
1 files changed, 16 insertions, 14 deletions
diff --git a/compiler/GHC/Rename/HsType.hs b/compiler/GHC/Rename/HsType.hs
index 99b928af3f..90540eda08 100644
--- a/compiler/GHC/Rename/HsType.hs
+++ b/compiler/GHC/Rename/HsType.hs
@@ -80,14 +80,22 @@ to break several loop.
*********************************************************
-}
-data HsSigWcTypeScoping = AlwaysBind
- -- ^ Always bind any free tyvars of the given type,
- -- regardless of whether we have a forall at the top
- | BindUnlessForall
- -- ^ Unless there's forall at the top, do the same
- -- thing as 'AlwaysBind'
- | NeverBind
- -- ^ Never bind any free tyvars
+data HsSigWcTypeScoping
+ = AlwaysBind
+ -- ^ Always bind any free tyvars of the given type, regardless of whether we
+ -- have a forall at the top.
+ --
+ -- For pattern type sigs and rules we /do/ want to bring those type
+ -- variables into scope, even if there's a forall at the top which usually
+ -- stops that happening, e.g:
+ --
+ -- > \ (x :: forall a. a-> b) -> e
+ --
+ -- Here we do bring 'b' into scope.
+ | BindUnlessForall
+ -- ^ Unless there's forall at the top, do the same thing as 'AlwaysBind'
+ | NeverBind
+ -- ^ Never bind any free tyvars
rnHsSigWcType :: HsSigWcTypeScoping -> HsDocContext -> LHsSigWcType GhcPs
-> RnM (LHsSigWcType GhcRn, FreeVars)
@@ -96,12 +104,6 @@ rnHsSigWcType scoping doc sig_ty
return (sig_ty', emptyFVs)
rnHsSigWcTypeScoped :: HsSigWcTypeScoping
- -- AlwaysBind: for pattern type sigs and rules we /do/ want
- -- to bring those type variables into scope, even
- -- if there's a forall at the top which usually
- -- stops that happening
- -- e.g \ (x :: forall a. a-> b) -> e
- -- Here we do bring 'b' into scope
-> HsDocContext -> LHsSigWcType GhcPs
-> (LHsSigWcType GhcRn -> RnM (a, FreeVars))
-> RnM (a, FreeVars)