michael@0: actual = '';
michael@0: expected = '0,0,1,1,2,2,3,3,';
michael@0: 
michael@0: v = 0
michael@0: let(
michael@0: f = function() {
michael@0:     for (let x = 0; x < 4; ++x) {
michael@0:         v >> x;
michael@0:         (function() {
michael@0:             for (let y = 0; y < 2; ++y) {
michael@0:                 appendToActual(x)
michael@0:             }
michael@0:         })()
michael@0:     }
michael@0: }) { (function() {})()
michael@0:     f(v)
michael@0: }
michael@0: 
michael@0: 
michael@0: assertEq(actual, expected)