base_as_notnull.nit:41,6: Warning: expression is not null, since it is a `A`.
base_as_notnull.nit:42,6--7: Warning: expression is not null, since it is a `A`.
base_as_notnull.nit:43,6: Warning: expression is not null, since it is a `B`.
base_as_notnull.nit:52,6: Warning: expression is not null, since it is a `B`.
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