1 base_as_notnull.nit:41,6: Warning: 'as(not null)' on non nullable type.
2 base_as_notnull.nit:42,6--7: Warning: 'as(not null)' on non nullable type.
3 base_as_notnull.nit:43,6: Warning: 'as(not null)' on non nullable type.
4 base_as_notnull.nit:52,6: Warning: 'as(not null)' on non nullable type.