On Oct 10, 2013, at 1:14 PM, David Menendez wrote: > Sure, but if op uses show internally, we get Int's show, not Age's, right? > That seems correct, in that it's doing what GND is supposed to do, but I'll > bet it will surprise people.
Yes, you're right. If a method in a subclass uses a superclass method, it uses the base type's instance's method, not the newtype's. Very weird, but I guess it makes sense in its own way. This does show how GND can create instance incoherence even without storing dictionaries in datatypes. Richard _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
