and I change one line code, than program does not panic.
func TestPoint(t *testing.T) {
type A struct {
X int
Y string
}
type B struct {
X int
Y string
Z string
}
a := A{X: 2, Y: "yy"}
b := (*B)(unsafe.Pointer(&a))
b.Z = "zz"
// fmt.Printf(" z: %v\n", b.Z)
fmt.Printf(" z: %v\n", &b.Z) // a move to heap
return
}
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