Replace interning of string literals with preinterned symbols #14650
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y21
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The `&[&str]` path based `clippy_utils` have been removed and replace with a new type `PathLookup`: - [`match_trait_method`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.match_trait_method.html) - [`match_qpath`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.match_qpath.html) - [`match_path`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.match_path.html) - [`match_any_def_paths`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.match_any_def_paths.html) - [`match_def_path`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.match_def_path.html) - [`match_type`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/ty/fn.match_type.html) - [`get_trait_def_id`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.get_trait_def_id.html) Internally `PathLookup` is a lazy call to `lookup_path` (the new name for [`def_path_res`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.def_path_res.html) to distinguish it from [`path_res`](https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/fn.path_res.html)) The `invalid_paths` internal lint is removed, it could be reimplemented but it feels redundant since every path should be covered by a test anyway ### User facing changes - `manual_saturating_arithmetic` now checks for `u32::MAX/MIN` instead of only detecting the legacy numeric consts (`std::u32::MAX/MIN`), `clippy::legacy_numeric_constants` will redirect usages of the legacy versions to the new one - `allow-invalid = true` now suppresses all invalid path warnings, currently you can run into a warning that can't be ignored in some situations, e.g. with `serde` without the `derive` feature ``` warning: expected a macro, found a trait --> /home/gh-Alexendoo/temp/clippy.toml:2:5 | 2 | { path = "serde::Serialize", allow-invalid = true }, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ``` - Re-exports of primitives types like `std::primitive::*` no longer work in `disallowed-types`, this seems acceptable since it would be unusual to deny a primitive this way rather than writing e.g. `usize`. Type aliases such as `c_char` are unaffected - A similar slight performance improvement to #14650 ```bash $ hyperfine -w 2 -p 'touch src/cargo/lib.rs' 'cargo +master clippy' 'cargo +lazy-paths clippy' ``` ``` Benchmark 1: cargo +master clippy Time (mean ± σ): 6.829 s ± 0.064 s [User: 6.079 s, System: 0.673 s] Range (min … max): 6.705 s … 6.907 s 10 runs Benchmark 2: cargo +lazy-paths clippy Time (mean ± σ): 6.765 s ± 0.064 s [User: 5.984 s, System: 0.698 s] Range (min … max): 6.636 s … 6.834 s 10 runs Summary cargo +lazy-paths clippy ran 1.01 ± 0.01 times faster than cargo +master clippy ``` changelog: none
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It was removed in rust-lang/rust-clippy#14650. We can either call `Symbol::intern()` manually (which is what this commit does), or use the new preinterned symbol system (https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/interface/struct.Config.html#structfield.extra_symbols).
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On rust-lang/cargo@8ddf367 it's a slight improvement
Part 1 of removing
Symbol <-> strconversionschangelog: none