alt/base_as_notnull2_alt3.nit:30,12--25: Warning: expression is already not null, since it is a `Object`.
alt/base_as_notnull2_alt3.nit:50,12--25: Warning: expression is already not null, since it is a `F: Object`.
alt/base_as_notnull2_alt3.nit:64,7--10: Type error: expected Int, got null