[antlr-interest] Simple grammar will not compile. I can't figure it out.

[Stevenson, Todd (GE Healthcare, consultant)]

This grammar will not compile.  I can't figure out why not.  It
generates the error:
 
reference to undefined rule: keypath
 
even though it exists.  Help!
 
Thanks.
 
------------------------------------------------------------------------
------------------------------------------------
grammar cepath;
 
options {
 output=AST;
 ASTLabelType=CommonTree; 
}
 
 
 
start
 : cpath EOF
 ;
 
cpath 
 : KEY keypath
 | DataPath
 ; 
 
DataPath
 : CODE keypath
 ;
 

keypath
 : SEP CODE 
 | SEP DOMAIN
 ;
 

// $<lex
 
KEY    : 'key';
CODE   : 'code';
DOMAIN   : 'domain';
 

SEP  : '.';
WS   :  ( '\r' | '\n')+ {skip();};
 
// $>
 
 
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