[Haskell-cafe] Problem with prepose.lhs and ghc6.10.1

[Claus Reinke]

> Hugs did not support lexically scoped type variables then (and 
> probably doesn't support now).

I may be misremembering, but I think Hugs had them first;-)

http://cvs.haskell.org/Hugs/pages/hugsman/exts.html#sect7.3.3

It is just that Hugs and GHC interpret the language extension 
differently (as usual), so it doesn't quite support the same code
in both. That is made worse by differences in other language 
features relevant to using this extension. Not to mention that
all of that keeps evolving over time.

Claus