emberjs/ember.js — pull request #4915 by jembezmamy (2014-05-22 07:19:17+00:00)
Title: Clearer error message in replace method in ContainerView

Previous message was unclear for me (or I understood it wrong). It sound like I can't nest a view in already nested parent. I suppose the real meaning should be that I can't nest a child in a parent, if the child is already nested somewhere else.