#3101: GHC crashes on synonym family in a rank-n type
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Reporter: MartijnVanSteenbergen | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Testcase:
Os: MacOS X | Architecture: Unknown/Multiple
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Comment (by MartijnVanSteenbergen):
I have to add that while the above snippet makes no sense as a Haskell
program, I was in fact doing something along the following lines, which
does make sense:
{{{
type family F a :: * -> *
data Boom a = Boom (forall b. F a b)
deriving Show
}}}
Also note that there is no problem when "deriving Show" is left away.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3101#comment:1>
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