Open
Description
Using the following flags
--force-warn overflowing_literals
this code:
fn main() {
const XYZ: char = 0xEF8888 as char;
println!("{}", XYZ);
}
caused the following diagnostics:
Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.9yw7ni8AzjBW/icemaker_clippyfix_tempdir.Hb8kKG9SiLPB/_a)
warning: only `u8` can be cast into `char`
--> src/main.rs:2:23
|
2 | const XYZ: char = 0xEF8888 as char;
| ^^^^^^^^^^^^^^^^ help: use a `char` literal instead: `'\u{EF8888}'`
|
= note: requested on the command line with `--force-warn overflowing-literals`
warning: `_a` (bin "_a") generated 1 warning (run `cargo clippy --fix --bin "_a"` to apply 1 suggestion)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
However after applying these diagnostics, the resulting code:
fn main() {
const XYZ: char = '\u{EF8888}';
println!("{}", XYZ);
}
no longer compiled:
Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.9yw7ni8AzjBW/icemaker_clippyfix_tempdir.Hb8kKG9SiLPB/_a)
error: invalid unicode character escape
--> src/main.rs:2:24
|
2 | const XYZ: char = '\u{EF8888}';
| ^^^^^^^^^^ invalid escape
|
= help: unicode escape must be at most 10FFFF
error: could not compile `_a` (bin "_a") due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `_a` (bin "_a" test) due to 1 previous error
Version:
rustc 1.90.0-nightly (25cf7d13c 2025-07-07)
binary: rustc
commit-hash: 25cf7d13c960a3ac47d1424ca354077efb6946ff
commit-date: 2025-07-07
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7