ac wrote: > foo :: [Foo] -> <placeholder 1> > foo xs = map <placeholder 2> xs > > What are the possible type signatures for placeholder 1 and the possible > expressions for placeholder 2?
A nice GHCi trick I learned from #haskell: > :t let foo xs = map ?placeholder2 xs in foo forall a b. (?placeholder2::a -> b) => [a] -> [b] Also, the djinn tool might provide some actual expression for placeholder 2. Zun. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe