Fix abort due to panic in Drop impl for Scope #13
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If a worker thread panics before all tasks have been dispatched, then submitting more jobs (and attempting to send the join signal to threads that have panicked) will return Err(_), which causes the a panic while panicking, which brings down the thread.
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If a worker thread panics before all tasks have been dispatched, then
submitting more jobs (and attempting to send the join signal to threads
that have panicked) will return Err(_), which causes the a panic while
panicking, which brings down the thread.