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Description
Using the following flags
--force-warn clippy::needless-for-each
this code:
use std::collections::*;
fn main() {
let vec: Vec<i32> = Vec::new();
vec.iter().for_each(|v| println!("{}", v));
}caused the following diagnostics:
Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.wwIYilbqcRrS/icemaker_clippyfix_tempdir.9qZ6jSOOassq/_a)
warning: needless use of `for_each`
--> src/main.rs:5:5
|
5 | vec.iter().for_each(|v| println!("{}", v));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_for_each
= note: requested on the command line with `--force-warn clippy::needless-for-each`
help: try
|
5 ~ for v in vec.iter() {
6 + $crate::io::_print($crate::format_args_nl!($($arg)*));
7 + }
|
warning: `_a` (bin "_a") generated 1 warning
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
However after applying these diagnostics, the resulting code:
use std::collections::*;
fn main() {
let vec: Vec<i32> = Vec::new();
for v in vec.iter() {
$crate::io::_print($crate::format_args_nl!($($arg)*));
}
}no longer compiled:
Checking _a v0.1.0 (/tmp/icemaker_global_tempdir.wwIYilbqcRrS/icemaker_clippyfix_tempdir.9qZ6jSOOassq/_a)
error: expected expression, found `$`
--> src/main.rs:6:9
|
6 | $crate::io::_print($crate::format_args_nl!($($arg)*));
| ^ expected expression
error: could not compile `_a` (bin "_a" test) due to 1 previous error
warning: build failed, waiting for other jobs to finish...
error: could not compile `_a` (bin "_a") due to 1 previous error
Version:
rustc 1.90.0-nightly (9535feebd 2025-07-12)
binary: rustc
commit-hash: 9535feebd5741a55fc24e84060e82d41a75dac6e
commit-date: 2025-07-12
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.7