base_notnull.nit:25,6: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:28,6: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:31,7: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:32,7: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:33,7: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:34,7: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:35,7: Warning: expression is not null, since it is a `not null E`. base_notnull.nit:36,7: Warning: expression is not null, since it is a `not null E`. 1 2 1 2 1 2 1 2 1 2