Nicolas Pouillard wrote: > Henning Thielemann wrote: >> @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.
It's a bifunctor! :D I don't really mind. The application "list that may end with an error" uses a fixed b , so putting the a at the end makes sense. Regards, Heinrich Apfelmus -- http://apfelmus.nfshost.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
