base_isa_nil.nit:33,2--13: Warning: expression is already a `Object`.
base_isa_nil.nit:36,2--22: Warning: expression is already a `nullable Object` since it is a `Object`.
base_isa_nil.nit:43,2--22: Warning: expression is already a `nullable Object`.
true
true
true
true
true
true
false
false
false
true
true
true