[antlr-interest] Recognizer generation error flagging incorrect usage of tree operator ! on Java grammar

[Jason Veldicott]

Hi,

In Habelitz's (http://www.habelitz.com<http://www.habelitz.com/index.php?option=com_content&task=view&id=12&Itemid=8>)
Java
grammar, JavaTreeParser.g, could anyone suggest why the follow node/subtree
exclusion operator that I added after "expr" causes an error:

expression
    :   ^(EXPR expr!)                   <== Added !
    ;

Error msg:

error(10):  internal error: C:\antlr\java-grammar\JavaTreeParser.g :
java.lang.IllegalArgumentException: Can't find temp
late ruleRefBang.st; group hierarchy is [Java]
org.antlr.stringtemplate.StringTemplateGroup.lookupTemplate(StringTemplateGroup.java:507)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:392)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:404)
org.antlr.stringtemplate.StringTemplateGroup.lookupTemplate(StringTemplateGroup.java:484)
...

Apparently this indicates incorrect usage of the ! operator.

I'm trying to simplify the tree, to exclude expressions.

Thanks

Jason