ERROR cannot resolve symbol x
ERROR cannot resolve method foo
ERROR cannot resolve class sigma
ERROR cannot resolve parent class sigma
ERROR x is already defined in y
ERROR incompatible types: sigma required, but tau found
ERROR incompatible types: array required, but sigma found
ERROR operator o cannot be applied to sigma
ERROR operator o cannot be applied to sigma, tau
ERROR target not object, type sigma
ERROR mismatch in number of arguments
ERROR duplicate class
ERROR cyclic inheritance involving sigma
ERROR incompatible method override: x in class sigma