anchor.diff:     ;
   
   // atomic call statements ----------------------------------
  +
   argsCall
      : (argCall? WS? (COMMA | SEMICOLON) WS?)* argCall (WS? (COMMA | SEMICOLON) WS? argCall?)*
      ;
  
positive.code:    ;
  
  // lexer rules --------------------------------------------------------------------------------
  // keywords
  
  ACCESS
  
negative.code:    ;
  
  argDefaultValue
     : EQ WS? valueStmt
     ;
  
  subscripts
  