segfault if not parenthesis per clause

[unhammer]

This makes it segfault:

         ! 1[gender=(if (1.gender not = un and (1.gender = GD or 1.gender not = 2.gender)) 2.gender else 1.gender)]

workaround:

         1[gender=(if (1.gender not = un and (1.gender = GD or (1.gender not = 2.gender))) 2.gender else 1.gender)]

should probably fail compiletime instead?