deepclone.while

void main() {
 	{{{int z} y} x} a = {x:{y:{z:1}}};
 	{{{int z} y} x} b = a;
 	assert a == b;
 	b.x.y = {z:2};
 	assert a != b;
 	b.x.y.z = 1;
 	assert a == b;
 	
 	int[][][] p = [[[1, 2], [3, 4]], [[5, 6]], [[7]]];
 	int[][][] q = p;
 	assert q == p;
 	p[1][0][1] = 0;
 	assert q != p;
 	p[1][0][1] = 6;
 	assert p == q;
}