int[] a = [ 1, 2, 3, 4 ];
a.insertInPlace(2, [ 1, 2 ]);
assert(a == [ 1, 2, 1, 2, 3, 4 ]);
a.insertInPlace(3, 10u, 11);
assert(a == [ 1, 2, 1, 10, 11, 2, 3, 4]);

union U
{
    float a = 3.0;
    int b;
}

U u1 = { b : 3 };
U u2 = { b : 4 };
U u3 = { b : 5 };
U[] unionArr = [u2, u3];
unionArr.insertInPlace(2, [u1]);
assert(unionArr == [u2, u3, u1]);
unionArr.insertInPlace(0, [u3, u2]);
assert(unionArr == [u3, u2, u2, u3, u1]);

static class C
{
    int a;
    float b;

    this(int a, float b) { this.a = a; this.b = b; }
}

C c1 = new C(42, 1.0);
C c2 = new C(0, 0.0);
C c3 = new C(int.max, float.init);

C[] classArr = [c1, c2, c3];
insertInPlace(classArr, 3, [c2, c3]);
C[5] classArr1 = classArr;
assert(classArr1 == [c1, c2, c3, c2, c3]);
insertInPlace(classArr, 0, c3, c1);
C[7] classArr2 = classArr;
assert(classArr2 == [c3, c1, c1, c2, c3, c2, c3]);