Please validate!

[Manuel M T Chakravarty]

This is what I got when validating the HEAD this morning:

simplCore/CoreMonad.lhs:39:0:
     Warning: Module `Name' is imported, but nothing from it is used,
                except perhaps instances visible in `Name'
              To suppress this warning, use: import Name()

<no location info>:
Failing due to -Werror.

In other words, the recent patches introducing the core monad stuff  
cannot have been properly validated!  Can we please validate every  
single patch in a clean tree before pushing to the main repository?

Thanks,
Manuel