Method UserValue

lua.go:1069–1076

UserValue pushes onto the stack the Lua value associated with the userdata at index. This value must be a table or nil. http://www.lua.org/manual/5.2/manual.html#lua_getuservalue

(index int)

//
// http://www.lua.org/manual/5.2/manual.html#lua_getuservalue
func (l *State) UserValue(index int) {
	d := l.indexToValue(index).(*userData)
	if d.env == nil {
		l.apiPush(nil)
	} else {
		l.apiPush(d.env)
	}
}

// SetGlobal pops a value from the stack and sets it as the new value of
// global name.