I thought I could use the directive ":set +m" to define a function with its signature.

Prelude> :set +m
Prelude> square :: Num a=>a->a

<interactive>:3:1: error: Variable not in scope: square :: a1 -> a1

Instead, I have to type:

Prelude> :unset +m
Prelude> :{
Prelude| square :: Num a=>a->a
Prelude| square = (^2)
Prelude| :}
Prelude>

Any hint ?

--
Fabien
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