joliss/broccoli-es6-concatenator — pull request #7 by twokul (2014-03-26 17:57:13+00:00)
Title: Throw the error for downstream handlers

This one comes from ember-cli issue
[#154](https://github.com/stefanpenner/ember-cli/issues/154).

ember-cli dies with `Unhandled Error` and doesn't recover from exception
gracefully. Moreover, ember-cli is not aware of the nature of the error.