code: func (l *State) RawSet(index int) {
  	l.checkElementCount(2)
  	t := l.indexToValue(index).(*table)
  	t.put(l, l.stack[l.top-2], l.stack[l.top-1])
  	t.invalidateTagMethodCache()
  	l.top -= 2
  }
docs: // RawSet is similar to SetTable, but does a raw assignment (without
  // metamethods).
  //
  // http://www.lua.org/manual/5.2/manual.html#lua_rawset