[Haskell-cafe] Usage of rewrite rule specialization in Hackage

[Scott Kilpatrick]

I'm looking for "real" code that uses the kind of GHC rewrite rule
that specializes a polymorphic function with another one, as described
here <http://www.haskell.org/ghc/docs/latest/html/users_guide/rewrite-
rules.html#rule-spec>.  Can anyone point me to any popular packages in
Hackage that make use of this?

Thanks,
Scott