def p_first(p):
    """
    const_expr : STRING_LIT
               | FLOAT_LIT
               | INTEGER_LIT
               | BOOLEAN_LIT
    expr : primary
    primary : simple_primary
    native_element : primary
                   | NATIVE_STRING_LIT
    type : simple_type
    statement : simple_statement newlines
              | dlt
    actions : action
    parameter_types_list : parameter_types_list1
    opmode_type : AUTONOMOUS
                | TELEOP
    """
    p[0] = p[1]
