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E0308 hint suggests adding a return type to a closure #128561
Description
Code
fn main() {
b"abc".iter().for_each(|x| dbg!(x))
}Current output
error[E0308]: mismatched types
--> src/main.rs:2:32
|
2 | b"abc".iter().for_each(|x| dbg!(x))
| -^^^^^^^ expected `()`, found `&u8`
| |
| help: try adding a return type: `-> &u8`
|Desired output
error[E0308]: mismatched types
--> src/main.rs:2:32
|
2 | b"abc".iter().for_each(|x| dbg!(x))
| -^^^^^^^ expected `()`, found `&u8`
| |
| help: try ignoring this value: `_ = dbg!(x)`Rationale and extra context
closures have their return type inferred if not specified, so adding a return type to a closure will never fix a type mismatch error.
Other cases
No response
Rust Version
1.80.0Anything else?
No response
Activity
Rollup merge of rust-lang#135562 - chenyukang:yukang-fix-128561, r=co…
Unrolled build for rust-lang#135562
chenyukang commentedon May 23, 2025
This issue should be reopen, because of comment:
#135562 (comment)