Nil pointer dereference caused by underscore-ignored parameter

[y1yang0]

The current implementation causes a nil pointer panic when a parameter is ignored with an underscore, as it attempts to dereference a nil pointer in the trampoline.

type M struct{}

func TargetFunc(_ M) {
	Trampoline(nil)
}

func Trampoline(arg *M) {
	Hook(*arg) // panic
}

func Hook(arg M) {}

func main() {
	TargetFunc(M{})
}