scala/scala — pull request #1729 by JamesIry (2012-12-07 18:00:58+00:00)
Title: SI-5789 Removes assertion about implclass flag in Mixin.scala

The assertion that the class being mixed from should be an implclass
seems reasonable, but the flag isn't always set. In order to stop the
bleeding this fix turns the assertion into a debug warning. Issue SI-6782
will track figuring out the root cause of the missing flag.