code: func (l *State) RawGet(index int) {
  	t := l.indexToValue(index).(*table)
  	l.stack[l.top-1] = t.at(l.stack[l.top-1])
  }
docs: // RawGet is similar to GetTable, but does a raw access (without metamethods).
  //
  // http://www.lua.org/manual/5.2/manual.html#lua_rawget