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-rw-r--r--lib/thwait.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/thwait.rb b/lib/thwait.rb
index 8003f0d3c7..3c17009310 100644
--- a/lib/thwait.rb
+++ b/lib/thwait.rb
@@ -96,7 +96,7 @@ class ThreadsWait
# adds thread(s) to join, no wait.
def join_nowait(*threads)
- @threads.concat threads
+ @threads.concat threads.flatten
for th in threads
Thread.start do
th = th.join