12 Apr
2018
12 Apr
'18
3:51 p.m.
On Thu, Apr 12, 2018 at 3:47 PM, Dennis Raddle
myFunc :: a -> b -> c myFunc x y z = ... where helper :: a -> [b] helper xx = ...
Notice that I'm attempting to declare 'helper' using my type variables. I've noticed that this results in an error. Is this actually possible, and how?
You need the ScopedTypeVariables extension, *and* to "declare" the type variables whose scope is to be extended with an explicit "forall" in the signature. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net