Hello!
At the end of this message is a program with a simple expression type,
and a class `ToExpr` that generalizes expressions to arbitrary Haskell
types. Every node in `Expr` is annotated with some abstract information.
The program raises the following type error:
test.hs:13:5:
Ahh, never mind... I just realized there's no way to relate the `info`
in the instance to the `info` in the class definition.
Alright, I'll keep trying to make this work. Sorry for the noise!
/ Emil
2011-05-16 12:19, Emil Axelsson skrev:
Hello!
At the end of this message is a program with
