| 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 1 previous error |
| |
