[antlr-interest] Source positions for imaginary tokens

[Mike Lischke]

> For instance like this: lb=LBRACE block RBRACE ^(DUM[$lb,"SLIST"] block)
> 
> The imaginary token DUM will get the position information of the left
> brace and will show in the AST tree as SLIST.
> 
> I got this information from the reference (book of TParr).


Unfortunately, this doesn't work with all targets. For instance the C target has a bug that prevents the use of things like DUM[$lb].

Mike
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