sindresorhus/grunt-concurrent — pull request #31 by baer (2014-01-16 22:50:08+00:00)
Title: Warn users about running more tasks than the concurrencyLimit

Concurrent is often used with watch which will hold on to the processes spawned. If there are more tasks to be run than the concurrencyLimit and a task like watch never lets go of processes, concurrent will never execute some tasks. This is a particularly hard bug to track down when encountered since it will fail silently.