[Haskell-cafe] Re: [Haskell] Re: Trying to install binary-0.4
isaacdupree at charter.net
Tue Oct 16 15:25:35 EDT 2007
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).
> 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
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).
More information about the Haskell-Cafe