31 Aug
2010
31 Aug
'10
1:17 p.m.
2010/8/31 michael rice
"Learn You a Haskell ..." says that (->) is a type just like Either. Where can I find its type definition?
You can't define it *in* Haskell as user code. It is a built-in infix type constructor (Either or Maybe are type constructors too, not just types). In fact, if you want to implement a simple, typed functional language, you'll find it is the only built-in type constructor you have to implement (as the implementor of the language). Also, Show a => a is a type too, but you won't find a definition for 'a' or for '=>'. All those things are defined by the language. Cheers, Thu