Re: [Haskell-cafe] The instability of Haskell libraries

John Goerzen schrieb:

My second example was the addition of instances to time.

My conclusion was: Never define orphan instances privately. If an instance cannot be added to the packages that provide the associated type or the class, then discuss the orphan instance with the maintainers of the type and the class and setup a package that provides that instance. http://www.haskell.org/haskellwiki/Orphan_instance