x = {a = 28, b = 2 }
(x.a += 10) = -26
(x.b = 17) = 1
x = {a = -26, b = 1 }
f(&x) = -28
f(&x) = -30
f(&x) = -32
x = {a = -29, b = 4 }
Ding!
x = {a = 10, b = 4 }
Ding!
x = {a = 12, b = 4 }