Function UpValueJoin

lua.go:1315–1319

UpValueJoin makes the n1-th upvalue of the Lua closure at index f1 refer to the n2-th upvalue of the Lua closure at index f2.

(l *State, f1, n1, f2, n2 int)

// UpValueJoin makes the n1-th upvalue of the Lua closure at index f1 refer to
// the n2-th upvalue of the Lua closure at index f2.
func UpValueJoin(l *State, f1, n1, f2, n2 int) {
	u1 := l.upValue(f1, n1)
	u2 := l.upValue(f2, n2)
	*u1 = *u2
}

// Call calls a function. To do so, use the following protocol: first, the
// function to be called is pushed onto the stack; then, the arguments to the