+test_isa.nit:25,7--19: Warning: Expression is already a Object.
+test_isa.nit:34,7--19: Warning: Expression is already a Object.
+test_isa.nit:43,7--28: Warning: Expression is already a nullable Object.
int:
true
true
true
true
true
-test_isa.nit:25,7--19: Warning: Expression is already a Object.
-test_isa.nit:34,7--19: Warning: Expression is already a Object.
-test_isa.nit:43,7--28: Warning: Expression is already a nullable Object.