Non-literal arguments to unreachable!() are rejected starting with v1.59.0 #94475
Description
Code
I tried this code:
fn main() {
let blah = "foobar";
unreachable!(format!("{}", blah));
}In 2021 edition.
On 1.58.1 this compiles, but on 1.59.0 and later it fails to build:
error: format argument must be a string literal
--> src/main.rs:3:18
|
3 | unreachable!(format!("{}", blah));
| ^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might be missing a string literal to format with
|
3 | unreachable!("{}", format!("{}", blah));
| +++++
error: could not compile `format-test` due to previous error
Version it worked on
It most recently worked on: 1.58.1
Version with regression
1.59.0 stable on Rust playground, as well as the following nightly version:
rustc 1.61.0-nightly (4ce374923 2022-02-28)
binary: rustc
commit-hash: 4ce3749235fc31d15ebd444b038a9877e8c700d7
commit-date: 2022-02-28
host: x86_64-unknown-linux-gnu
release: 1.61.0-nightly
LLVM version: 14.0.0