Summary
Context: https://www.reddit.com/r/rust/comments/1qvmm3l/guess_how_long_it_took_to_spot_this_little/
I posted a rant about a dumb mistake. Got lots of replies telling me Clippy definitely would have caught the issue. Clippy did not catch the issue. ☹️
Lint Name
clippy::single_element_loop
Reproducer
I tried this code:
fn f(print: bool) {
for _ in [..5] {
if print {
println!("Hello from f");
}
}
}I expected to see this happen:
warning: this loops only once with `_` being `..5`
--> src/main.rs:2:14
|
2 | for _ in [..5] {
| ^^^^^ help: did you mean to iterate over the range instead?: `..5`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.93.0/index.html#single_element_loop
= note: `#[warn(clippy::single_element_loop)]` on by default
Instead, this happened:
Version
rustc 1.93.0 (254b59607 2026-01-19)
binary: rustc
commit-hash: 254b59607d4417e9dffbc307138ae5c86280fe4c
commit-date: 2026-01-19
host: aarch64-apple-darwin
release: 1.93.0
LLVM version: 21.1.8
Summary
Context: https://www.reddit.com/r/rust/comments/1qvmm3l/guess_how_long_it_took_to_spot_this_little/
I posted a rant about a dumb mistake. Got lots of replies telling me Clippy definitely would have caught the issue. Clippy did not catch the issue.☹️
Lint Name
clippy::single_element_loop
Reproducer
I tried this code:
I expected to see this happen:
Instead, this happened:
Version