scala/scala — pull request #2067 by retronym (2013-02-04 23:50:51+00:00)
Title: SI-5675 Discard duplicate feature warnings at a position

When -feature has not been enabled, we were double counting
identical feature warnings that were emitted at the same position.
Normal error reporting only reports the first time a warning
appears at a position; feature warning counter incrementing
should behave the same way.

Review by @hubertp