rust-clippy/tests/ui/crashes/unreachable-array-or-slice.rs

struct Foo(isize, isize, isize, isize);

pub fn main() {
    let Self::anything_here_kills_it(a, b, ..) = Foo(5, 5, 5, 5);
    match [5, 5, 5, 5] {
        [..] => { }
    }
}
Overhaul how stashed diagnostics work, again. Stashed errors used to be counted as errors, but could then be cancelled, leading to `ErrorGuaranteed` soundness holes. #120828 changed that, closing the soundness hole. But it introduced other difficulties because you sometimes have to account for pending stashed errors when making decisions about whether errors have occured/will occur and it's easy to overlook these. This commit aims for a middle ground. - Stashed errors (not warnings) are counted immediately as emitted errors, avoiding the possibility of forgetting to consider them. - The ability to cancel (or downgrade) stashed errors is eliminated, by disallowing the use of `steal_diagnostic` with errors, and introducing the more restrictive methods `try_steal_{modify,replace}_and_emit_err` that can be used instead. Other things: - `DiagnosticBuilder::stash` and `DiagCtxt::stash_diagnostic` now both return `Option<ErrorGuaranteed>`, which enables the removal of two `delayed_bug` calls and one `Ty::new_error_with_message` call. This is possible because we store error guarantees in `DiagCtxt::stashed_diagnostics`. - Storing the guarantees also saves us having to maintain a counter. - Calls to the `stashed_err_count` method are no longer necessary alongside calls to `has_errors`, which is a nice simplification, and eliminates two more `span_delayed_bug` calls and one FIXME comment. - Tests are added for three of the four fixed PRs mentioned below. - `issue-121108.rs`'s output improved slightly, omitting a non-useful error message. Fixes #121451. Fixes #121477. Fixes #121504. Fixes #121508. 2024-02-26 04:21:01 +00:00			`struct Foo(isize, isize, isize, isize);`

			`pub fn main() {`
			`let Self::anything_here_kills_it(a, b, ..) = Foo(5, 5, 5, 5);`
			`match [5, 5, 5, 5] {`
			`[..] => { }`
			`}`
			`}`