rust/tests/ui/lowering/issue-121108.rs

#![derive(Clone, Copy)] //~ ERROR `derive` attribute cannot be used at crate level

use std::ptr::addr_of;

const UNINHABITED_VARIANT: () = unsafe {
    let v = *addr_of!(data).cast();
};

fn main() {}
Reinstate some delayed bugs. These were changed to `has_errors` assertions in #121071 because that seemed reasonable, but evidently not. Fixes #121103. Fixes #121108. 2024-02-14 21:31:46 +00:00			#![derive(Clone, Copy)] //~ ERROR `derive` attribute cannot be used at crate level

			`use std::ptr::addr_of;`

			`const UNINHABITED_VARIANT: () = unsafe {`
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			`let v = *addr_of!(data).cast();`
Reinstate some delayed bugs. These were changed to `has_errors` assertions in #121071 because that seemed reasonable, but evidently not. Fixes #121103. Fixes #121108. 2024-02-14 21:31:46 +00:00			`};`

			`fn main() {}`