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

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

compiler/rustc_middle/src/mir/mod.rs

@@ -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(()));