Hi,

I'm fixing http://hackage.haskell.org/trac/ghc/ticket/2467
>

Since you bring up orphans, I have a more general question regarding them
that came up recently.

The design of a library I'm working on requires orphan modules. After
reading the GHC user's guide, I believe that orphans are (only) a
compile-time performance issue and that they do not affect run-time
performance. Can someone confirm my understanding? Is there any other
concern we should have with orphans? The library is not a large project, so
I'm not concerned with build time. We're currently ignoring the issue with
-fno-warn-orphans.

Thanks,
Sean
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