[Haskell-cafe] double existential type

Ozgur Akgun ozgurakgun at gmail.com
Wed Mar 24 13:15:29 EDT 2010

Hello all,

I have a syntax issue (hopefully!)

-- this is perfectly fine:
data Unary = forall a. Unary a

-- this one as well:
data Binary = forall a. Binary a a

-- but not this one
-- parse error on input forall :(
data Binary' = forall a. forall b. Binary' a b

I tried different kinds of bracketings and orderings but no luck...

Ozgur Akgun
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