| | type State = Term a = [a]
| | data M a = M (State - IO(State,a))
| |
| | GHC yields a error message Illegal polymorphic type.
| | How to resolve this?
I can tell you what it happening. If you have -fglasgow-exts on, the
type
for State is short for
type State = forall a. Term
G'day all.
On Tue, Mar 11, 2003 at 08:34:06AM +1300, Tom Pledger wrote:
If, on the other hand, you want to vary the state type *during* a
single monadic computation, it gets messy. You could try one of the
following.
Very often, you just want to vary the state type for some portion
of the
