class A{}
void main() {
A[] a = null;
A[] b = new A[6];
string c = null;
string d = "Hello World";
assert(null == "");
assert("".length == 0);
assert(a.length == 0);
assert(b.length == 6);
assert(c.length == 0);
assert(a is null);
assert(b !is null);
assert(c is null);
assert(d !is null);
assert(null !is "");
}
Y2xhc3MgQXt9Cgp2b2lkIG1haW4oKSB7CglBW10gYSA9IG51bGw7CglBW10gYiA9IG5ldyBBWzZdOwoJc3RyaW5nIGMgPSBudWxsOwoJc3RyaW5nIGQgPSAiSGVsbG8gV29ybGQiOwoJYXNzZXJ0KG51bGwgPT0gIiIpOwoJYXNzZXJ0KCIiLmxlbmd0aCA9PSAwKTsKCWFzc2VydChhLmxlbmd0aCA9PSAwKTsKCWFzc2VydChiLmxlbmd0aCA9PSA2KTsKCWFzc2VydChjLmxlbmd0aCA9PSAwKTsKCWFzc2VydChhIGlzIG51bGwpOwoJYXNzZXJ0KGIgIWlzIG51bGwpOwoJYXNzZXJ0KGMgaXMgbnVsbCk7Cglhc3NlcnQoZCAhaXMgbnVsbCk7Cglhc3NlcnQobnVsbCAhaXMgIiIpOwp9