test_attr_easy.nit:20,5--16: Warning: expression is already a `String`.
test_attr_easy.nit:20,20--26: Warning: expression is already a `B`.
test_attr_easy.nit:20,44--63: Warning: expression is already a `HashMap[Int, B]`.
test_attr_easy.nit:20,5--16: Warning: expression is already a `String`.
test_attr_easy.nit:20,20--26: Warning: expression is already a `B`.
test_attr_easy.nit:20,44--63: Warning: expression is already a `HashMap[Int, B]`.