<!-- Hi there! Whether you've come to make a suggestion for a new lint, an improvement to an existing lint or to report a bug or a false positive in Clippy, you've come to the right place. For bug reports and false positives, please include the output of `cargo clippy -V` in the report. Thank you for using Clippy! Write your comment below this line: --> Here's the reason why using it is bad sometimes. https://www.reddit.com/r/rust/comments/eiwhkn/why_is_iterator_so_much_faster/fctvmt4?utm_source=share&utm_medium=web2x