I just ran
/script d(LibStub) and the game froze (also with
LibStub:IterateLibraries()). Bad time. Couldn't view/switch to Task Mngr to kill it. Alt+F4 didn't work. Nothing worked, game stuck on screen, and couldn't close or move it to End Task. Only Win taskbar showed over it.
Finally, had use Winkey and "taskkill /f /im eso64.exe" to kill it.
Flawless Fatality!
Probably a recursive / infinite loop. Not friendly for addon developers.
Or is it just me?