[antlr-interest] Inserting a literal token in an AST rewrite rule

[Victor Liu]

Hi,

I have an AST producing grammar with a desired rule like

expression_unary_minus
	:	'-' expression_power -> ^(TOK_TIMES '-1' expression_power)
	|	expression_power
	;

This doesn't work because apparently I can't just insert a literal token 
('-1') in the rewrite rule. How do I get the same effect? Also, is there 
a way to simplify the rule into a one-liner? Ideally I would not need 
the second line since I just need a rule like

expression_unary_minus
	:	'-'? expression_power
	;

but allowing a rewrite.

Thanks in advance,
Victor