alt/base_as_notnull2_alt2.nit:30,12: Warning: expression is not null, since it is a `Object`.
alt/base_as_notnull2_alt2.nit:50,12: Warning: expression is not null, since it is a `F: Object`.
Runtime error: Cast failed (alt/base_as_notnull2_alt2.nit:40)
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