code: func (l *State) Field(index int, name string) {
  	t := l.indexToValue(index)
  	l.apiPush(name)
  	l.stack[l.top-1] = l.tableAt(t, l.stack[l.top-1])
  }
docs: // Field pushes onto the stack the value table[name], where table is the
  // table on the stack at the given index. This call may trigger a
  // metamethod for the __index event.
  //
  // http://www.lua.org/manual/5.2/manual.html#lua_getfield