scala/scala — pull request #4132 by phaller (2014-11-14 11:55:42+00:00)
Title: SI-7444 docs: null Executor allowed in ExecutionContext factories

Update the ScalaDoc for the factory methods for `ExecutionContext`
which allow a `null` `Executor`/`ExecutorService`.

Enhancement of https://github.com/scala/scala/pull/4119