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Yuki Okushi
0c5fccea22
Improve safety of `LateContext::qpath_res` This is my first rustc code change, inspired by hacking on clippy! The first change is to clear cached `TypeckResults` from `LateContext` when visiting a nested item. I took a hint from [here](https://github.com/rust-lang/rust/blob/5e91c4ecc09312d8b63d250a432b0f3ef83f1df7/compiler/rustc_privacy/src/lib.rs#L1300). Clippy has a `qpath_res` util function to avoid a possible ICE in `LateContext::qpath_res`. But the docs of `LateContext::qpath_res` promise no ICE. So this updates the `LateContext` method to keep its promises, and removes the util function. Related: rust-lang/rust-clippy#4545 CC ````````````@eddyb```````````` since you've done related work CC ````````````@flip1995```````````` FYI