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FP use_self requires generic_const_exprs #10756
Description
Summary
.
Lint Name
use_self
Reproducer
I tried this code:
struct Foo;
impl Foo {
fn foo<const N: usize>(&self) -> usize {
let f = self;
f.bar::<{
let f = Foo;
f.bar::<7>()
}>() + N
}
const fn bar<const M: usize>(&self) -> usize {
M
}
}
fn main() {
let f = Foo;
assert_eq!(f.foo::<13>(), 20)
}I saw this happen:
warning: unnecessary structure name repetition
--> const-arg-in-const-arg.rs:7:21
|
7 | let f = Foo;
| ^^^ help: use the applicable keyword: `Self`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#use_self
= note: requested on the command line with `-W clippy::use-self`
I expected to see this happen:
Suggestion does not compile wif const_generic_exprs feature is not enabled
error: generic parameters may not be used in const operations
--> const-arg-in-const-arg.rs:7:21
|
7 | let f = Self;
| ^^^^ cannot perform const operation using `Self`
|
= note: type parameters may not be used in const expressions
= help: use `#![feature(generic_const_exprs)]` to allow generic const expressions
error: aborting due to previous error
Version
rustc 1.71.0-nightly (6d140d59b 2023-05-06)
binary: rustc
commit-hash: 6d140d59bb957903b02ddb993450509d8d92b448
commit-date: 2023-05-06
host: x86_64-unknown-linux-gnu
release: 1.71.0-nightly
LLVM version: 16.0.2
Additional Labels
No response
Activity
xtqqczze commentedon Dec 31, 2025
Still an issue with Rust 1.92: https://godbolt.org/z/PeqKfKvbc