grammar Test;
options { output = AST; }
a: ('1'|'2') -> ;

ANTLR Parser Generator Version 3.0b6 (Jan 31, 2007) 1989-2007
error(10): internal error: Test.g :
java.lang.IllegalArgumentException: Can't find template
matchSetTrack.st
org.antlr.stringtemplate.StringTemplateGroup.lookupTemplate(StringTemplateGroup.java:485)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:372)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:384)
org.antlr.stringtemplate.StringTemplateGroup.lookupTemplate(StringTemplateGroup.java:464)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:372)
org.antlr.stringtemplate.StringTemplateGroup.getInstanceOf(StringTemplateGroup.java:384)
org.antlr.codegen.CodeGenTreeWalker.getTokenElementST(CodeGenTreeWalker.java:160)
org.antlr.codegen.CodeGenTreeWalker.set(CodeGenTreeWalker.java:2557)
org.antlr.codegen.CodeGenTreeWalker.atom(CodeGenTreeWalker.java:2243)
org.antlr.codegen.CodeGenTreeWalker.element(CodeGenTreeWalker.java:1370)
org.antlr.codegen.CodeGenTreeWalker.alternative(CodeGenTreeWalker.java:1115)
org.antlr.codegen.CodeGenTreeWalker.block(CodeGenTreeWalker.java:999)
org.antlr.codegen.CodeGenTreeWalker.rule(CodeGenTreeWalker.java:725)
org.antlr.codegen.CodeGenTreeWalker.rules(CodeGenTreeWalker.java:516)
org.antlr.codegen.CodeGenTreeWalker.grammarSpec(CodeGenTreeWalker.java:458)
org.antlr.codegen.CodeGenTreeWalker.grammar(CodeGenTreeWalker.java:305)
org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:415)
org.antlr.Tool.processGrammar(Tool.java:329)
org.antlr.Tool.process(Tool.java:266)
org.antlr.Tool.main(Tool.java:69)