18 Mar
2011
18 Mar
'11
9:31 a.m.
18.03.2011, 14:22, "Roel van Dijk"
Remember that constructors are functions, except that you can't pattern match against them.
..
The downside is that you can't pattern-match against these functions.
The thing is that I need pattern matching, just functions won't do. Anyway, a new question arose. If I have already declared a type, can I add new constructors to it from other modules? Maybe there are some GHC extensions to solve both these problems.