Does not seem to parse complex nested strings

[onigoetz]

Hi,

I'm making some tests and see that @eo-locale/core doesn't parse the following:

    {gender_of_host, select,
      female {
        {num_guests, plural, offset:1
          =0 {{host} does not give a party.}
          =1 {{host} invites {guest} to her party.}
          =2 {{host} invites {guest} and one other person to her party.}
          other {{host} invites {guest} and # other people to her party.}
        }
      }
      male {
        {num_guests, plural, offset:1
          =0 {{host} does not give a party.}
          =1 {{host} invites {guest} to his party.}
          =2 {{host} invites {guest} and one other person to his party.}
          other {{host} invites {guest} and # other people to his party.}
        }
      }
      other {
        {num_guests, plural, offset:1
          =0 {{host} does not give a party.}
          =1 {{host} invites {guest} to their party.}
          =2 {{host} invites {guest} and one other person to their party.}
          other {{host} invites {guest} and # other people to their party.}
        }
      }
    }

I get a Unexpected character "}" on position 335.

To be fair, I don't know how common it is to have a string like this, just wanted to report it as it is a valid ICU Messageformat string.