RE: panic with existential types

[Simon Peyton-Jones]

> resulted in the following compiler output using the command
> `ghc -fglasgow-exts -c Main.hs':
> 
> -------------------------------------
> panic! (the `impossible' happened):
>  applyTypeToArgs Main.MkFoo{-r1l,x-} {B1 PrelBase.True{-6y,w-}}

Thanks for a fine report.  Talk about falling at the first fence.
The inlining for constructors was totally broken.

I've fixed this, and checked it into the main new-rts CVS tree.
You can grab it from there or wait for a new release..

Simon