haskell/cabal — pull request #1882 by ttuegel (2014-05-20 18:50:29+00:00)
Title: Always stream test output concurrently

Issue #1810. Some test suites would freeze if invoked with
`--show-details=always` instead of `--show-details=streaming` because
output would build up in the pipe without being cleared. This corrects
the issue by forcing the length of the output string in another thread.