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