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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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compiler/rustc_middle/src/mir/mod.rs
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@ -2728,8 +2728,6 @@ pub struct UserTypeProjection {
pub projs: Vec<ProjectionKind>,
}
impl Copy for ProjectionKind {}
impl UserTypeProjection {
pub(crate) fn index(mut self) -> Self {
self.projs.push(ProjectionElem::Index(()));