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Improve unsafe extern blocks diagnostics Closes #126327 For this code: ```rust extern { pub fn foo(); pub safe fn bar(); } ``` We get ... ``` error: items in unadorned `extern` blocks cannot have safety qualifiers --> test.rs:3:5 | 3 | pub safe fn bar(); | ^^^^^^^^^^^^^^^^^^ | help: add unsafe to this `extern` block | 1 | unsafe extern { | ++++++ error[E0658]: `unsafe extern {}` blocks and `safe` keyword are experimental --> test.rs:3:9 | 3 | pub safe fn bar(); | ^^^^ | = note: see issue #123743 <https://github.com/rust-lang/rust/issues/123743> for more information = help: add `#![feature(unsafe_extern_blocks)]` to the crate attributes to enable error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0658`. ``` And then making the extern block unsafe, we get ... ``` error: extern block cannot be declared unsafe --> test.rs:1:1 | 1 | unsafe extern { | ^^^^^^ | = note: see issue #123743 <https://github.com/rust-lang/rust/issues/123743> for more information = help: add `#![feature(unsafe_extern_blocks)]` to the crate attributes to enable error: items in unadorned `extern` blocks cannot have safety qualifiers --> test.rs:3:5 | 3 | pub safe fn bar(); | ^^^^^^^^^^^^^^^^^^ error[E0658]: `unsafe extern {}` blocks and `safe` keyword are experimental --> test.rs:3:9 | 3 | pub safe fn bar(); | ^^^^ | = note: see issue #123743 <https://github.com/rust-lang/rust/issues/123743> for more information = help: add `#![feature(unsafe_extern_blocks)]` to the crate attributes to enable error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0658`. ``` r? ``@compiler-errors`` |
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