'argument_expression_list    : assignment_expression
| argument_expression_list COMMA assignment_expression'

def p_argument_expression_list(self, p):

    if (len(p) == 2):
        p[0] = c_ast.ExprList([p[1]], p[1].coord)
    else:
        p[1].exprs.append(p[3])
        p[0] = p[1]
