alt/base_as_notnull_alt7.nit:41,6: Warning: expression is not null, since it is a `A`.
alt/base_as_notnull_alt7.nit:42,6--7: Warning: expression is not null, since it is a `A`.
alt/base_as_notnull_alt7.nit:43,6: Warning: expression is not null, since it is a `B`.
alt/base_as_notnull_alt7.nit:52,6: Warning: expression is not null, since it is a `B`.
alt/base_as_notnull_alt7.nit:61,1--17: Type error: as(not null) on null