emberjs/ember.js — pull request #4939 by teddyzeenny (2014-05-26 19:52:13+00:00)
Title: [BUGFIX beta] Add more debugging info to each, with, and unless helpers

Possible cases:

- `{{each}}`
- `{{each items}}`
- `{{each item in items}}`
- `{{unless isEdit}}`
- `{{with subject}}`
- `{{with subject as person}}`

/cc @rjackson @wycats