[antlr-interest] Interpreter output inconsistent for "C style method calls"

[Buck, Robert]

Given something like this:

   MODULUS(16, FIRST_N_CHARACTERS(5, TO_ADDR()))


And running it through the interpreter using this grammar:

grammar test;
method
	:	ID arguments
	;
expression
	:	method
	|	literal
	;
literal	
	:	STRING
	|	INT
	;
arguments
	:	LPAREN (argumentList)? RPAREN
	;
argumentList
	:	expression (',' expression)*
	;
LPAREN	:	'(';
RPAREN	:	')';
ID  :   ('_'|'a'..'z'|'A'..'Z') ('_'|'a'..'z'|'A'..'Z'|'0'..'9')* ;
STRING : '"' .* '"' ;
INT :   '0'..'9'+ ;


When I compare the results of running the expression through 'method',
and through 'expression, I get different results:

> expression method MODULUS arguments ( argumentList expression literal
16

> method MODULUS arguments ( argumentList expression literal 16 ,
expression method FIRST_N_CHARACTERS arguments
    ( argumentList expression literal 5 , expression method TO_ADDR
arguments ( )

Now, as both have as a stem in their output 'method', I do not quite
understand why the interpreter produces different results in each case.

Am I missing something here?

Bob