22 May
2009
22 May
'09
9:26 a.m.
Henning Thielemann wrote:
John Goerzen schrieb:
So this is annoying (CCing -cafe)
I need NominalDiffTime and UTCTime to have Typeable instances. In 6.10.1, they didn't ship with them out of the box, so I added them. Apparently, in 6.10.3, they DO ship with those instances out of the box.
Annoyingly, that means that my code breaks on 6.10.3.
After having conflicting instances several times with some types in the past, I came to the conclusion that I should never define orphan instances. Can you restrict your package to 6.10.3 where an "official" instance is available?
I didn't care about presenting the instance to people using my library, but the instance was necessary within the library itself, and led to the compilation error. -- John