base_as_notnull.nit:41,6--19: Warning: expression is already not null, since it is a `A`.
base_as_notnull.nit:42,6--20: Warning: expression is already not null, since it is a `A`.
base_as_notnull.nit:43,6--19: Warning: expression is already not null, since it is a `B`.
base_as_notnull.nit:52,6--19: Warning: expression is already not null, since it is a `B`.
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