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Rollup merge of #111252 - matthewjasper:min-spec-improvements, r=compiler-errors

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Min specialization improvements

- Don't allow specialization impls with no items, such implementations are probably not correct and only occur as mistakes in the compiler and standard library
- Fix a missing normalization call
- Adds spans for lifetime errors from overly general specializations

Closes #79457
Closes #109815
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Dylan DPC 2023-05-09 12:33:46 +05:30 • committed by GitHub
commit f748bb1402
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20 changed files with 346 additions and 48 deletions
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4
compiler/rustc_trait_selection/src/traits/mod.rs
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@ -55,7 +55,9 @@ pub use self::select::{EvaluationCache, SelectionCache, SelectionContext};
pub use self::select::{EvaluationResult, IntercrateAmbiguityCause, OverflowError};
pub use self::specialize::specialization_graph::FutureCompatOverlapError;
pub use self::specialize::specialization_graph::FutureCompatOverlapErrorKind;
pub use self::specialize::{specialization_graph, translate_substs, OverlapError};
pub use self::specialize::{
specialization_graph, translate_substs, translate_substs_with_cause, OverlapError,
};
pub use self::structural_match::{
search_for_adt_const_param_violation, search_for_structural_match_violation,
};