21 Feb
2002
21 Feb
'02
8:06 p.m.
"Andre W B Furtado" <awfurtado@uol.com.br> writes:
Is is possible to declare a generic type without using "data" or "newtype"? For example, I woud like that "pair" is a type synonym for "(t,t)" where t is a generic type, but just saying:
type pair = (t,t)
won't work: i get a parse error.
- types in haskell must be capitalized (maybe a better syntax error message would be nice, i ran into the same pb) - "t" is a free variable, so you can't write this. Either write: type Pair t = (t,t) or type Pair = (Int,Int) or even type Pair t1 t2 = (t1, t2)