alt/base_as_notnull_alt6.nit:41,6: Warning: expression is not null, since it is a `A`.
alt/base_as_notnull_alt6.nit:42,6--7: Warning: expression is not null, since it is a `A`.
alt/base_as_notnull_alt6.nit:43,6: Warning: expression is not null, since it is a `B`.
alt/base_as_notnull_alt6.nit:52,6: Warning: expression is not null, since it is a `B`.
Runtime error: Cast failed (alt/base_as_notnull_alt6.nit:60)
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