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.

Cheers, Neil.

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>
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