Parser error

[guest]

Neil Turton says:

I wrote the following haskell program and hugs reported an internal compiler error when I tried to load it. The syntax is invalid but I would expect a sensible error message rather than the internal error which I got.

falcon:tmp$ cat foo.hs class Foo x where

foo

x

instance Foo () where

foo ?

falcon:tmp$ hugs foo.hs _ _

						Hugs 98: Based on the Haskell 98 standard
_						Copyright (c) 1994-2005
---	_	World Wide Web:  http://haskell.org/hugs
	Bugs:  http://hackage.haskell.org/trac/hugs
	Version: September 2006 _

Haskell 98 mode: Restart with command line option -98 to enable extensions

INTERNAL ERROR: parseInput Please report this Hugs bug to  http://hackage.haskell.org/trac/hugs Hugs> _