[Haskell-cafe] Custom unary operator extension?

[Peter Verswyvelen]

I find it unfortunate that one can't (I guess) define custom unary 
operators in Haskell.

Is this correct? If so, is this just because  eg (* 100) declares a 
function that partially applies the * operator, so this syntax disallows 
unary operators? Could this be fixed by introducing a different syntax 
for partial operator application? E.g. (? * 100) instead of just (*100)? 
This would also fix the ambiguity between (-10) as being either the 
number minus 10 or the "subtract by 10' function.

Cheers,
Peter