[antlr-interest] subtrees in tree grammar

[Terence Parr]

because I forgot to implement that.  Just put parens around the tree;  
i.e., (...)?.  Sorry about that.  I have fixed it in the new  
ANTLRv3.g grammar.

Ter
On Jul 19, 2007, at 8:01 AM, Andy Tripp wrote:

> Why does ANTLR complain when I have something like
>
>            ^(IMPLEMENTS typeList)?
>
>  in a tree grammar rule?
>
> Instead, it seems I have to separate out this "optional subtree"  
> into a separate rule:
>        implementsTypeList?
> ...
> implementsTypeList
>     : ^(IMPLEMENTS typeList)
>     ;
>

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