substack-escape-closure.go

func closure1() {
    var x *int
    func(x1 *int) {
        func(x2 *int) {
            func(x3 *int) {
                y := 1
                x3 = &y
            }(x2)
        }(x1)
    }(x)
    _ = x
}


func closure2() {
    var x *int
    func() {
        func() {
            func() {
                // y escapes to heap
                y := 1 
                // x is captured by a closure
                x = &y
            }()
        }()
    }()
    _ = x
}