Associated data types + GADTs: known bug?

[Conal Elliott]

Combining associated data types + GADTs proves fatal to GHCi 6.10.3 and
6.10.4.  Is this bug known?  If so, is it fixed in a later ghc?

There's a stand-alone example at
http://hpaste.org/fastcgi/hpaste.fcgi/view?id=13629

  - Conal
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