[antlr-interest] Composite tree grammar

[Bill Andersen]

Folks,

I want to use grammar import on tree grammars and did the test below  
using ANTLRWorks 1.2.  I wrote a simple grammar (Foo) to output an  
AST, a tree grammar (FooAST) to parse the latter, and another  
(FooASTImport) that imports FooAST and attempts to override the one  
rule in FooAST.  Code here.  I get a syntax error (in attached  
snapshot) but can't see where I'm going wrong.  Any help appreciated.

	.bill

grammar Foo;
options {
	output=AST;
}
tokens {
	FOO = 'foo';
	BAR = 'bar';
	ZAP;
}
start
	: FOO BAR
		-> ^(ZAP FOO BAR)
	;
	
-----------------------------------

tree grammar FooAST;
options {
	tokenVocab=Foo;
	output=AST;
}
start
	: ^(ZAP FOO BAR)
		-> ^(ZAP BAR FOO)
	;

-----------------------------------

tree grammar FooASTImport;
import FooAST;

options {
	tokenVocab=Foo;
	output=AST;
}

start
	: ^(ZAP FOO BAR)
		-> ^(ZAP FOO BAR)
	;

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Bill Andersen
Ontology Works, Inc. (www.ontologyworks.com)
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