ANNOUNCE: GHC version 6.4

[Simon Peyton-Jones]

| =============================================================
| >     The (Interactive) Glasgow Haskell Compiler -- version 6.4
| >
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| 2. What's up with "Warning: orphan instances"?

I believe I forgot do document the -fwarn-orphans flag.  But info is
here:

http://www.haskell.org/ghc/docs/latest/html/users_guide/separate-compila
tion.html#orphan-modules

Simon