why..?

gistfile1.txt

# irb
2.3.1 :001 > q = Queue.new
 => #<Thread::Queue:0x00000002150908> 
2.3.1 :002 > q.push(:a)
 => #<Thread::Queue:0x00000002150908> 
2.3.1 :003 > q.push(:b)
 => #<Thread::Queue:0x00000002150908> 
2.3.1 :004 > q.pop
 => :a 
2.3.1 :005 > q.pop
 => :b 
2.3.1 :006 > q.pop
fatal: No live threads left. Deadlock?
        from (irb):6:in `pop'
        from (irb):6
        from /usr/local/rvm/rubies/ruby-2.3.1/bin/irb:11:in `<main>'

Personally I think q.pop(false) is blocked when queue is empty.
ruby version: ruby 2.3.1p112

q.popでblockしちゃうと他にpushできるスレッドが無いから、そのまま停止してしまうからか。