mirror of
https://github.com/rust-lang/rust.git
synced 2025-11-04 06:56:14 +00:00
24 lines
1020 B
Plaintext
24 lines
1020 B
Plaintext
error: `Iterator::map` call that discard the iterator's values
|
|
--> $DIR/issue-109152.rs:5:21
|
|
|
|
|
LL | vec![42].iter().map(drop);
|
|
| ^^^^----^
|
|
| | |
|
|
| | this function returns `()`, which is likely not what you wanted
|
|
| | called `Iterator::map` with callable that returns `()`
|
|
| after this call to map, the resulting iterator is `impl Iterator<Item = ()>`, which means the only information carried by the iterator is the number of items
|
|
|
|
|
= note: `Iterator::map`, like many of the methods on `Iterator`, gets executed lazily, meaning that its effects won't be visible until it is iterated
|
|
note: the lint level is defined here
|
|
--> $DIR/issue-109152.rs:1:9
|
|
|
|
|
LL | #![deny(map_unit_fn)]
|
|
| ^^^^^^^^^^^
|
|
help: you might have meant to use `Iterator::for_each`
|
|
|
|
|
LL | vec![42].iter().for_each(drop);
|
|
| ~~~~~~~~
|
|
|
|
error: aborting due to previous error
|
|
|