Escaped parentheses inside test expression cause error

[SalBakraa]

[ \( 'aaa' = 'bbb' \) -o \( 'ccc' = 'ccc' \) ] is parsed incorrectly as:

ERROR [0, 0] - [0, 46]
  command [0, 2] - [0, 46]
    name: command_name [0, 2] - [0, 4]
      word [0, 2] - [0, 4]
    argument: raw_string [0, 5] - [0, 10]
    argument: word [0, 11] - [0, 12]
    argument: raw_string [0, 13] - [0, 18]
    argument: word [0, 19] - [0, 21]
    argument: word [0, 22] - [0, 24]
    argument: word [0, 25] - [0, 27]
    argument: raw_string [0, 28] - [0, 33]
    argument: word [0, 34] - [0, 35]
    argument: raw_string [0, 36] - [0, 41]
    argument: word [0, 42] - [0, 44]
    argument: word [0, 45] - [0, 46]

on the other hand [ ( 'aaa' = 'bbb' ) -o ( 'ccc' = 'ccc' ) ] generates the correct parse tree:

test_command [0, 0] - [0, 42]
  binary_expression [0, 2] - [0, 40]
    left: parenthesized_expression [0, 2] - [0, 19]
      binary_expression [0, 4] - [0, 17]
        left: raw_string [0, 4] - [0, 9]
        right: raw_string [0, 12] - [0, 17]
    operator: test_operator [0, 20] - [0, 22]
    right: parenthesized_expression [0, 23] - [0, 40]
      binary_expression [0, 25] - [0, 38]
        left: raw_string [0, 25] - [0, 30]
        right: raw_string [0, 33] - [0, 38]