“Pattern matching” of algebraic type data constructors

Question

Let\'s consider a data type with many constructors:

data T = Alpha Int | Beta Int | Gamma Int Int | Delta Int

I want to write a function to che

Answer 1

In some cases, "Scrap Your Boilerplate" library will help.

http://www.haskell.org/haskellwiki/Scrap_your_boilerplate