Strange panic when examining interface files

[Simon Marlow]

> The answer, once it stuck me, seemed quite obvious: use 
> --show-iface and
> the compiler will either show me the interface (I used the 
> compiler with
> right version) or will complain and say that it expected 
> number this and
> that but found <the number I was looking for>. Sadly, when 
> doing this with
> both ghc v6.0 and v6.0.1 I got the following:
> 
> ghc-6.0: panic! (the `impossible' happened, GHC version 6.0):
>         Ix{Int}.index: Index (16777216) out of range ((0,36))

Thanks, this will be fixed in 6.2.

Cheers,
	Simon