On Wed, Jan 16, 2008 at 01:02:43PM +0800, Martin Sulzmann wrote: > Bruno Oliveira writes: > > I have been playing with ghc6.8.1 and type families and the following > > program is accepted without any type-checking error: > > > > > data a :=: b where > > > Eq :: a :=: a ... > > Ofcourse, that before ghc6.8, we add no type-level functions so maybe it > > was ok to consider the program above. ... > > > type family K a
Type families are unsupported, and their intersection with GADTs are unimplemented. Don't expect any program which uses both to do anything sane until 6.10. Stefan
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