alt/base_as_notnull_alt3.nit:41,6: Warning: 'as(not null)' on non nullable type.
alt/base_as_notnull_alt3.nit:42,6--7: Warning: 'as(not null)' on non nullable type.
alt/base_as_notnull_alt3.nit:43,6: Warning: 'as(not null)' on non nullable type.
alt/base_as_notnull_alt3.nit:52,6: Warning: 'as(not null)' on non nullable type.
alt/base_as_notnull_alt3.nit:53,6--20: Type error: expected B, got A