At least it doesn't fail any of your provided test cases :)

But a single escaped double quote in the example is sufficient to make it return garbage.

// comment should not appear
main(void)
  {
  int foo = 1 << 5;
  puts("testing \"quoted\" string");
  exit(0); // done
  }
[download]

...
          [
            'Identifier',
            'puts'
          ],
          [
            'LeftParen',
            '('
          ],
          [
            'string',
            'testing \\'
          ],
          [
            'Identifier',
            'quoted'
          ],
          [
            'character',
            '\\'
          ],
          [
            'string',
            ' string'
          ],
          [
            'RightParen',
            ')'
          ],
          [
            'Semicolon',
            ';'
          ],
...
[download]

There is no identifier named quoted in the example C/C++ code. quoted is part of a string passed to puts().

Alexander