google/traceur-compiler — pull request #728 by johnjbarton (2014-01-29 17:14:06+00:00)
Title: Report an error on circular dependencies.

Add a test for circular dependency.
Detect and report useful error message:
"Unsupported circular dependency between feature/Modules/ImportCircular.module
and feature/Modules/resources/clockwise"
See issue #684.