[antlr-interest] $ in action comments

[Gavin Lambert]

At 06:30 22/02/2008, Ian Moor wrote:
 >I have finally tracked down two errors from generating a tree
 >parser:
 >error(111): pico/Gen.g:16:9: reference to attribute outside of a 

 >rule: zero
 >error(114): pico/Gen.g:454:11: attribute is not a token, 
parameter,
 >or return value: v0
 >
 > in the first case there is a  // comment in the 
members  sections
 >containing $zero, and in the second case there is a comment  in 
an
 >action containing a $v0.

ANTLR doesn't understand the syntax of the target language, so it 
doesn't know what are comments and what aren't.  The only things 
it looks for are $s (to expand), }s (to terminate the block), and 
{s (to avoid terminating too early).