[antlr-interest] Switching buildAST to true causes "Invalid AST node type" error.

[Phil Ritchie]

The grammar below generates classes that build and run
fine if buildAST is set to false. As soon as I set it
to true (without changing anything else) my parser
raises an "Invalid AST node type" error. I'm not
trying to traverse the AST, just build it. Can anyone
tell me what I'm doing wrong.

---start grammar---
options
{
	language = "CSharp";
}

class IntAndIDLexer extends Lexer;

INT		: ('0'..'9')+ ;

ID		: ('a'..'z')+ ;

COMMA	: ',' ;


class SeriesParser extends Parser;
options
{
	buildAST = true;
}

series	: element (COMMA element)* ;

element
	:	a:INT	{System.Console.WriteLine(a.getText());}
	|	b:ID	{System.Console.WriteLine(b.getText());}
	;
---end grammar---


		
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