the EitherT monad transformer
Latest commit e47e7cd Oct 19, 2017 @gwils gwils committed with RyanGlScott instance Apply Validation (#49)



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This provides an Either monad transformer that unlike ErrorT is unencumbered by a constraint on its Left hand argument. This is needed for a number of applications of this monad transformer, notably in recursion-schemes.

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Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on

-Edward Kmett