[antlr-interest] Bug report; generated C code fails to compile with empty scopes

[Richard Thrippleton]

With rules of the form

"rulename
scope {}
..."

the generated code for that rule will attempt to push and pop the 
rulename scope stack, but the Push, Pop and Top members have not been 
defined.

(fwiw, empty scopes are actually useful in the grammars I'm building :-) )

Richard