error in format string : unreachable!("foo {bar,baz}"); no longer compiles #93761
Description
I tried this code:
unreachable!("passing both, --remove-if-{older,younger}-than was temporarily disabled!");I expected to see this happen:
This used to compile with edition 2018 and 2021 until rustc 1.60.0-nightly (734368a20 2022-02-07)
Instead, this happened: (edition 2021)
https://github.com/matthiaskrgr/cargo-cache/blob/a9b9f30fe6726390288c2337663409adc666a8a3/src/date.rs#L179
error: invalid format string: expected `'}'`, found `','` --> src/date.rs:179:59 | 179 | unreachable!("passing both, --remove-if-{older,younger}-than was temporarily disabled!") | - ^ expected `}` in format string | | | because of this opening brace | = note: if you intended to print `{`, you can escape it using `{{` I'm not sure why this didn't pop up in the crater run for #93394 so made a ticket just in case, cc @m-ou-se
Feel free to close if this is a a true positive. :)
Meta
rustc --version --verbose:
rustc 1.60.0-nightly (734368a20 2022-02-07) binary: rustc commit-hash: 734368a200904ef9c21db86c595dc04263c87be0 commit-date: 2022-02-07 host: x86_64-unknown-linux-gnu release: 1.60.0-nightly LLVM version: 13.0.0