[Haskell-cafe] Classes in type declarations in Hugs

[John Goerzen]

Hello,

I have this line:

type CPResult a = MonadError CPError m => m a

GHC (with various command-line options I'm already using) compiles this
fine.

hugs, with -98 +o, complains:

Syntax error in input (unexpected `=>')

How do I make this work both places?