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50edb32939
rust/compiler/rustc_hir_analysis
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surechen 50edb32939 Fix a error suggestion for E0121 when using placeholder _ as return types on function signature. 
Recommit after refactoring based on comment:
https://github.com/rust-lang/rust/pull/126017#issuecomment-2189149361

But when changing return type's lifetime to `ReError` will affect the subsequent borrow check process and cause test11 in typeck_type_placeholder_item.rs to lost E0515 message.
```rust
fn test11(x: &usize) -> &_ {
//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types
    &x //~ ERROR cannot return reference to function parameter(this E0515 msg will disappear)
}

```
2024-06-29 14:23:33 +08:00
..
src Fix a error suggestion for E0121 when using placeholder _ as return types on function signature. 2024-06-29 14:23:33 +08:00
Cargo.toml bump itertools to 0.12 2024-03-08 12:34:05 +03:00
messages.ftl Auto merge of #126319 - workingjubilee:rollup-lendnud, r=workingjubilee 2024-06-12 11:10:50 +00:00
README.md rustc_typeck to rustc_hir_analysis 2022-09-27 10:37:23 +02:00

README.md

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