Multiple definitions does not result in an error

Hi,

The following code:

> f a = undefined
> f :: a -> b
> f a = undefined

Under Hugs May 2006 does not raise an error.

Under GHC:
    Multiple declarations of `Main.f'

Under Yhc:
    Error: Redefinition of Identifier f at 5:1-5:15

I guess Hugs is wrong in this case.

Thanks

Neil