Don't report bivariance error when nesting a struct with field errors into another struct #131754
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… into another struct
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diagnostics-path only @bors rollup |
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…nce, r=estebank
Don't report bivariance error when nesting a struct with field errors into another struct
We currently have logic to avoid reporting lifetime bivariance ("lifetime parameter ... is never used") errors when a struct has field resolution errors. However, this doesn't apply transitively. This PR implements a simple visitor to do so.
This was reported [here](https://twitter.com/fasterthanlime/status/1846257921086165033) since a `derive(Deserialize, Serialize)` ends up generating helper structs which have bivariant lifetimes due to containing the offending struct (that's being derived on).
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Rollup of 10 pull requests Successful merges: - rust-lang#131582 (Add wasm32-unknown-emscripten platform support document) - rust-lang#131694 (Make fuchsia-test-runner.py compatible with new JSON output from llvm-readelf) - rust-lang#131700 (Fix match_same_arms in stable_mir) - rust-lang#131712 (Mark the unstable LazyCell::into_inner const) - rust-lang#131746 (Relax a memory order in `once_box`) - rust-lang#131754 (Don't report bivariance error when nesting a struct with field errors into another struct) - rust-lang#131760 (llvm: Match aarch64 data layout to new LLVM layout) - rust-lang#131764 (Fix unnecessary nesting in run-make test output directories) - rust-lang#131766 (Add mailmap entry for my dev-desktop setup) - rust-lang#131771 (Handle gracefully true/false in `cfg(target(..))` compact) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#131754 - compiler-errors:bivariance-bivariance, r=estebank Don't report bivariance error when nesting a struct with field errors into another struct We currently have logic to avoid reporting lifetime bivariance ("lifetime parameter ... is never used") errors when a struct has field resolution errors. However, this doesn't apply transitively. This PR implements a simple visitor to do so. This was reported [here](https://twitter.com/fasterthanlime/status/1846257921086165033) since a `derive(Deserialize, Serialize)` ends up generating helper structs which have bivariant lifetimes due to containing the offending struct (that's being derived on).
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We currently have logic to avoid reporting lifetime bivariance ("lifetime parameter ... is never used") errors when a struct has field resolution errors. However, this doesn't apply transitively. This PR implements a simple visitor to do so.
This was reported here since a
derive(Deserialize, Serialize)ends up generating helper structs which have bivariant lifetimes due to containing the offending struct (that's being derived on).