base_isa_nullable1.nit:39,8--15: Warning: Expression is already a A since it is a B[Integer].
base_isa_nullable1.nit:41,8--24: Warning: Expression is already a B[Discrete] since it is a B[Integer].
base_isa_nullable1.nit:46,8--25: Warning: Expression is already a B[B[Integer]].
base_isa_nullable1.nit:48,8--26: Warning: Expression is already a B[B[Discrete]] since it is a B[B[Integer]].
base_isa_nullable1.nit:50,8--33: Warning: Expression is already a B[nullable Discrete] since it is a B[Discrete].
true