[Haskell-cafe] Data constructor synonyms
sargrigory at ya.ru
Fri Mar 18 14:31:20 CET 2011
18.03.2011, 14:22, "Roel van Dijk" <vandijk.roel at gmail.com>;:
> 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.
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