-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.
-base_isa_nil.nit:43,2--22: Warning: Expression is already a nullable Object.
+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`.
+base_isa_nil.nit:43,2--22: Warning: expression is already a `nullable Object`.
true
true
true