Re: [Haskell-cafe] Re: Are there standard idioms for lazy, pure error handling?

Excerpts from Henning Thielemann's message of Mon Dec 07 20:36:27 +0100 2009:

@Apfelmus:

For practical purposes I think Train should have swapped type parameters in order to make Functor act on the type of the list elements.

data Train b a = Wagon a (Train b a) | Loco b

The functor on the Loco/Caboose makes sense too and swapping the arguments is less natural to read. -- Nicolas Pouillard http://nicolaspouillard.fr