a := struct {
	A int    `json:"a"` // comment a
	B string `b`        // comment b
}{1, "Hello"}

println(a)

b := &struct {
	A int // a
	B string
}{1, "Hello"}

c := &struct {
	a int
	b string
}{1, "Hello"}

println(b)

a.A, a.B = 1, "Hi"
println(a)

b.A, b.B = 2, "Hi2"
println(b)

c.a, c.b = 3, "Hi3"
println(c)