GeneralizedNewtypeDeriving regression in HEAD?

Nathan Howell nathan.d.howell at
Fri Dec 27 03:30:24 UTC 2013

I can't file a trac ticket at the meny but wanted to see if this is a
bug... This is an excerpt from llvm-general that compiles on 7.6.3 but
doesn't without ImpredicativeTypes enabled on HEAD:

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