#2497: Weird scoping for tyvars in rules
------------------------+---------------------------------------------------
Reporter: rl | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.3 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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This rule:
{{{
{-# RULES "id" forall (x :: a). id x = x #-}
}}}
compiles fine with no `LANGUAGE` options but fails if I add `Rank2Types`:
{{{
Not in scope: type variable `a'
}}}
It compiles fine again if I additionally include `ScopedTypeVariables`.
This looks wrong to me.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2497>
GHC <http://www.haskell.org/ghc/>
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