[Yhc] Data.Typeable

[Neil Mitchell]

Hi Tom and Yhc,

I remember that you previously mentioned that you had implemented
Yhc.Typeable or something similar which provides an interface which is
a superset of Data.Typeable. Is that reliable? Does it really provide
a superset of the implementation?

It appears that quite a few of the patches required to get Yhc
compiling the base libraries are to remove Data.Typeable. These
patches could be reduced if Data.Typeable could be implemented in a
Yhc specific way.

Thanks

Neil