Orphan Instances with GHC 6.8

Adrian Hey ahey at iee.org
Wed Oct 17 09:02:58 EDT 2007

Hello Folks,

One thing different from 6.6 and 6.8 is I find that with -Wall
I get a lot more warnings about orphan instances, even if the
code has not changed.

Has the definition of what an Orphan instance is changed?

Or is this a bug? If so, is the bug in 6.6 or 6.8?

I can make them go away with the -fno-warn-orphans flag,
but I'm still curious as to why I didn't have to do this before.

Adrian Hey

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