rust/tests/ui/panics/fmt-only-once.rs
2023-04-25 18:11:28 +02:00

22 lines
432 B
Rust

// run-fail
// check-run-results
// exec-env:RUST_BACKTRACE=0
// Test that we format the panic message only once.
// Regression test for https://github.com/rust-lang/rust/issues/110717
use std::fmt;
struct PrintOnFmt;
impl fmt::Display for PrintOnFmt {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
eprintln!("fmt");
f.write_str("PrintOnFmt")
}
}
fn main() {
panic!("{}", PrintOnFmt)
}