[antlr-interest] Rules of this form no longer working for me under new ANTLR

[Shaun Bogan]

I've been migrating to the newest version of ANTLRWorks (and I presume
there must be a new version of ANTLR underlying it).  Several rules
that worked previously, no longer work.

squarecall
	:	(SQUARELEFT (statementnocolon (',' statementnocolon)*)?
SQUARERIGHT)-> statementnocolon*
	;

Which should match both [a,b,c,d] and [], but only works for the first
form.  In the second form I get a rewrite exception saying the stream
is empty.  Is there an option that used to be default, that I have
off, or does the new version of ANTLR work differently for this?  If I
don't attempt to rewrite it (i.e. get rid of the "->
statementnocolon*") it doesn't cause an error, but I obviously get '['
and ']' in my output.

Any help is appreciated.

Thanks,
S M Bogan