rust/compiler/rustc_hir_analysis
surechen a61126cef6 By tracking import use types to check whether it is scope uses or the other situations like module-relative uses, we can do more accurate redundant import checking.
fixes #117448

For example unnecessary imports in std::prelude that can be eliminated:

```rust
use std::option::Option::Some;//~ WARNING the item `Some` is imported redundantly
use std::option::Option::None; //~ WARNING the item `None` is imported redundantly
```
2024-02-18 16:38:11 +08:00
..

For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.