[11:45:19] warning(200): mygrammar.g:14:57: Decision can match input such as "','" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
[11:45:19] warning(200): C:\Users\Jarrod Roberson\mygrammar.g:14:57: Decision can match input such as "','" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input

I want to be able to nest functions inside other functions.

myfunction(x) ->
  sqr(a) -> a * a,
  y = sqr(x).

here is the line it is complaining about

function : ID '(' args ')' '->' statement (',' statement)* ;

and here is what it is considering the alternative

statement : ATOM
          | expression
          | assignment
          | function
          ;

Here is what the synatx diagram looks like in ANTLRWorks

I really like things to compile/work without any warnings. How do I resolve this warning condition?