fails:Thread#abort_on_exception is false by default
fails:Thread#abort_on_exception returns true when #abort_on_exception= is passed true
fails:Thread#abort_on_exception= when enabled and the thread dies due to an exception causes the main thread to raise the exception raised in the thread
fails:Thread.abort_on_exception is false by default
fails:Thread.abort_on_exception returns true when .abort_on_exception= is passed true
fails:Thread.abort_on_exception= when enabled and a non-main thread dies due to an exception causes the main thread to raise the exception raised in the thread
