ghci problem parsing where

[Simon Marlow]

> Using GHC Interactive, version 5.02:
> 
> Prelude> x where x = 5
> <interactive>:1: parse error on input `where'
> 
> let works fine:
> 
> Prelude> let x = 5 in x
> 5

'where' clauses aren't allowed on an arbitrary expression.  They are
allowed as part of a declaration only - see the 'rhs' production in the
Haskell grammar.

Cheers,
	Simon