code: func (l *State) Global(name string) {
  	g := l.global.registry.atInt(RegistryIndexGlobals)
  	l.push(name)
  	l.stack[l.top-1] = l.tableAt(g, l.stack[l.top-1])
  }
docs: // Global pushes onto the stack the value of the global name.
  //
  // http://www.lua.org/manual/5.2/manual.html#lua_getglobal