3aa1a24799
Make `Ty::primitive_symbol` recognize `str` Make `Ty::primitive_symbol` recognize `str`, which makes `str` eligible for the "expected primitive, found local type" (and vice versa) [diagnostic](https://github.com/rust-lang/rust/blob/master/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs#L1430-L1437) that already exists for other primitives. <details><summary> diagnostic difference</summary> ```rs #[allow(non_camel_case_types)] struct str; fn foo() { let _: &str = "hello"; let _: &core::primitive::str = &str; } ``` `rustc --crate-type lib --edition 2021 a.rs` Current nightly: ```rs error[E0308]: mismatched types --> a.rs:5:19 | 5 | let _: &str = "hello"; | ---- ^^^^^^^ expected `str`, found a different `str` | | | expected due to this | = note: expected reference `&str` found reference `&'static str` error[E0308]: mismatched types --> a.rs:6:36 | 6 | let _: &core::primitive::str = &str; | --------------------- ^^^^ expected `str`, found a different `str` | | | expected due to this | = note: expected reference `&str` (`str`) found reference `&str` (`str`) error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`. ``` With this patch: ```rs error[E0308]: mismatched types --> a.rs:5:19 | 5 | let _: &str = "hello"; | ---- ^^^^^^^ expected `str`, found a different `str` | | | expected due to this | = note: str and `str` have similar names, but are actually distinct types = note: str is a primitive defined by the language note: `str` is defined in the current crate --> a.rs:2:1 | 2 | struct str; | ^^^^^^^^^^ error[E0308]: mismatched types --> a.rs:6:36 | 6 | let _: &core::primitive::str = &str; | --------------------- ^^^^ expected `str`, found a different `str` | | | expected due to this | = note: str and `str` have similar names, but are actually distinct types = note: str is a primitive defined by the language note: `str` is defined in the current crate --> a.rs:2:1 | 2 | struct str; | ^^^^^^^^^^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`. ``` </details> |
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| README.md | ||
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