base_isa_gen5.nit:39,8--15: Warning: expression is already a `A` since it is a `B[Canard]`.
base_isa_gen5.nit:40,8--23: Warning: expression is already a `B[Canard]`.
base_isa_gen5.nit:41,8--23: Warning: expression is already a `B[Animal]` since it is a `B[Canard]`.
base_isa_gen5.nit:46,8--26: Warning: expression is already a `B[B[Canard]]`.
base_isa_gen5.nit:48,8--26: Warning: expression is already a `B[B[Animal]]` since it is a `B[B[Canard]]`.
true