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Get rid of existentials #65

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sol opened this issue Apr 14, 2012 · 0 comments

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sol commented Apr 14, 2012

Currently AnyExample is an existential; and I think we can express the same thing as an ordinary algebraic data type.

Something like this should work.

class Example a where
  evaluateExample :: a -> AnyExample

data AnyExample = AnyExample (IO Result)

See also: http://lukepalmer.wordpress.com/2010/01/24/haskell-antipattern-existential-typeclass/

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