// @target: es5
var globalCounter = 0;
function foo() {
    globalCounter += 1;
    return { 0: 2 };
}
foo()[0] **= foo()[0];
var result_foo1 = foo()[0] **= foo()[0];
foo()[0] **= foo()[0] **= 2;
var result_foo2 = foo()[0] **= foo()[0] **= 2;
foo()[0] **= foo()[0] ** 2;
var result_foo3 = foo()[0] **= foo()[0] ** 2;