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946192b25a
Fix autofix for `self` and `self as …` in `unused_imports` lint
This fixes two problems with the autofixes for the `unused_imports` lint:
- `use std::collections::{HashMap, self as coll};` would suggest, when `HashMap` is unused, the incorrect `use std::collections::self as coll;` which does not compile.
- `use std::borrow::{self, Cow};` would suggest, when `self` is unused, `use std::borrow::{Cow};`, which contains unnecessary brackets.
The first problem was reported in rust-lang/rust-clippy#14450, the second found while fixing the first one.
Fix #133750
(thanks to `@richardsamuels` for spotting the duplicate)