exist.hs:73:
My brain just exploded.
I can't handle pattern bindings for existentially-quantified
constructors.
It was my brain. (Though I discussed it with Mark, and I think
Hugs may have a similar restriction.)
data GenPic = forall pot. (PictureObject pot) = MkGenPic pot
main
Simon Peyton-Jones writes:
data GenPic = forall pot. (PictureObject pot) = MkGenPic pot
main :: IO ()
main = do
putStr $ getPictureName obj
where MkGenPic obj = item
item = head obj_list
The problem is the pattern binding for MkGenPic. Try
