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Regression test `println!()` panic message on `ErrorKind::BrokenPipe` No existing test (that I could find) failed if the `panic!()` of the `println!()` family of functions was removed, or if its message was changed: https://github.com/rust-lang/rust/blob/104f4300cfddbd956e32820ef202a732f06ec848/library/std/src/io/stdio.rs#L1007-L1009 So add such a test. This is in preparation of adding a hint about the existence of [`unix_sigpipe`](https://github.com/rust-lang/rust/issues/97889) if that is the reason for the panic. Even if we don't end up adding a hint, this is still a sensible test to have, I think. `@rustbot` label +A-testsuite +A-io +T-libs +O-unix