[Haskell-cafe] understanding typeable
aeyakovenko at gmail.com
Sun Apr 12 15:42:35 EDT 2009
i am trying to figure out how typeable works, so i have this data type
data Foo = FooC Int
deriving (Data, Typeable, Show)
So how come this works:
> funResultTy (typeOf ((+) 1)) (typeOf 1)
but this doesnt:
> funResultTy (typeOf FooC) (typeOf 1)
FooC is of type t -> u and 1 is of type t so the result should be u?
I don't think t and u need to be the same since
> funResultTy (typeOf (\a -> a:)) (typeOf 1)
works fine. So given a constructor, how come i cant seem to construct
a type out of it?
More information about the Haskell-Cafe