Hello,
I've recently uploaded a package that provides some kind of extended
pattern matching. For example, one can use ("abc" ++ xs) as a pattern.
The original motivation was to allow pattern matching on expressions of
embedded languages in cases when the constructors of the underlying data
types are hidden.
For more examples, see http://hackage.haskell.org/package/funpat
Feedback is very welcome!
Cheers,
Gergely
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