Re: [Haskell-cafe] Intro to monad transformers

On Sun, 26 Dec 2010, David Menendez wrote:

instance Show (MaybeT m a)

This is never valid. You've defined show, shows, and showsPrec in terms of each other, creating unbounded recursion. Delete it.

Unfortunately, the -Wall option of GHC won't help here, since all the methods are defined by default methods.