thread '<unnamed>' ($TID) panicked at tests/pass/panic/thread_panic.rs:LL:CC:
Hello!
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
note: in Miri, you may have to set `MIRIFLAGS=-Zmiri-env-forward=RUST_BACKTRACE` for the environment variable to have an effect

thread 'childthread' ($TID) panicked at tests/pass/panic/thread_panic.rs:LL:CC:
Hello, world!