Ross Paterson wrote:
I would make "API extended only" a bit more precise: any module that uses explicit import lists will not be affected by the changes. So one can add classes, types and functions, but not instances (except where either the class or the type is new).
okay
You probably can't add data constructors or fields, and have to be careful with new methods.
If they're exported and new members of existing classes/datatypes, then you can't add them, because they might be imported with "class/typename(..)". (right?)
What about semantic changes to the API? Including, adding a default to a class method changes the default from 'undefined', which someone might have relied on as the default (although it seems unlikely).
Isaac _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
