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abi: unsized field in union - assert to delay bug #114060
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During borrowck, the `MultiSpan` from a buffered diagnostic is cloned and used to emit a delayed bug indicating a diagnostic was buffered - when the buffered diagnostic is translated, then the cloned `MultiSpan` may contain labels which can only render with the diagnostic's arguments, but the delayed bug being emitted won't have those arguments. Adds a function which clones `MultiSpan` without also cloning the contained labels, and use this function when creating the buffered diagnostic delayed bug. Signed-off-by: David Wood <[email protected]>
Unions cannot have unsized fields, and as such, layout computation for unions asserts that each union field is sized (as this would normally have halted compilation earlier). However, if a generator ends up with an unsized local - a circumstance in which an error will always have been emitted earlier, for example, if attempting to dereference a `&str` - then the generator transform will produce a union with an unsized field. Since rust-lang#110107, later passes will be run, such as constant propagation, and can attempt layout computation on the generator, which will result in layout computation of `str` in the context of it being a field of a union - and so the aforementioned assertion would cause an ICE. It didn't seem appropriate to try and detect this case in the MIR body and skip this specific pass; tainting the MIR body or delaying a bug from the generator transform (or elsewhere) wouldn't prevent this either (as neither would prevent the later pass from running); and tainting when the deref of `&str` is reported, if that's possible, would unnecessarily prevent potential other errors from being reported later in compilation, and is very tailored to this specific case of getting a unsized type in a generator. Given that this circumstance can only happen when an error should have already been reported, the correct fix appears to be just changing the assert to a delayed bug. This will still assert if there is some circumstance where this occurs and no error has been reported, but it won't crash the compiler in this instance. Signed-off-by: David Wood <[email protected]>
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#114008 (coverage: Obtain the `__llvm_covfun` section name outside a per-function loop) - rust-lang#114014 (builtin_macros: expect raw strings too) - rust-lang#114043 (docs(LazyLock): add example pass local LazyLock variable to struct) - rust-lang#114051 (Add regression test for invalid "unused const" in method) - rust-lang#114052 (Suggest `{Option,Result}::as_ref()` instead of `cloned()` in some cases) - rust-lang#114058 (Add help for crate arg when crate name is invalid) - rust-lang#114060 (abi: unsized field in union - assert to delay bug ) r? `@ghost` `@rustbot` modify labels: rollup
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…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#114008 (coverage: Obtain the `__llvm_covfun` section name outside a per-function loop) - rust-lang#114014 (builtin_macros: expect raw strings too) - rust-lang#114043 (docs(LazyLock): add example pass local LazyLock variable to struct) - rust-lang#114051 (Add regression test for invalid "unused const" in method) - rust-lang#114052 (Suggest `{Option,Result}::as_ref()` instead of `cloned()` in some cases) - rust-lang#114058 (Add help for crate arg when crate name is invalid) - rust-lang#114060 (abi: unsized field in union - assert to delay bug ) r? `@ghost` `@rustbot` modify labels: rollup
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Area: Translation infrastructure, and migrating existing diagnostics to SessionDiagnostic
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Fixes #113279.
While debugging this, I noticed a translation ICE in a delayed bug, so I fixed that too: