Thread 1 starting, will block on mutex
Thread 1 reported it has started
thread '<unnamed>' panicked at $DIR/concurrent-panic.rs:LL:CC:
panic in thread 2
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Thread 2 blocking on thread 1
Thread 2 reported it has started
Unlocking mutex
thread '<unnamed>' panicked at $DIR/concurrent-panic.rs:LL:CC:
panic in thread 1
Thread 1 has exited
Thread 2 has exited