#59 0x000000018e934758 in UIApplicationMain () #60 0x0000000103001330 in main at xxxxxxxxxx #61 0x00000001843a5fc0 in start () Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial) #0 0x0000000105de08f4 in _dispatch_queue_push () #1 0x00000001058f9194 in DispatchQueue.async(group:qos:flags:execute:) ()
if DispatchQueue.isMain && currentNumberEnqueued == 1 {