Auto merge of #94225 - matthiaskrgr:rollup-0728x8n, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #91192 (Some improvements to the async docs)
 - #94143 (rustc_const_eval: adopt let else in more places)
 - #94156 (Gracefully handle non-UTF-8 string slices when pretty printing)
 - #94186 (Update pin_static_ref stabilization version.)
 - #94189 (Implement LowerHex on Scalar to clean up their display in rustdoc)
 - #94190 (Use Metadata::modified instead of FileTime::from_last_modification_ti…)
 - #94203 (CTFE engine: Scalar: expose size-generic to_(u)int methods)
 - #94211 (Better error if the user tries to do assignment ... else)
 - #94215 (trait system: comments and small nonfunctional changes)
 - #94220 (Correctly handle miniz_oxide extern crate declaration)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_infer/src/infer/higher_ranked/mod.rs

@@ -123,7 +123,9 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         result
     }
 
-    /// See `infer::region_constraints::RegionConstraintCollector::leak_check`.
+    /// See [RegionConstraintCollector::leak_check][1].
+    ///
+    /// [1]: crate::infer::region_constraints::RegionConstraintCollector::leak_check
     pub fn leak_check(
         &self,
         overly_polymorphic: bool,

compiler/rustc_infer/src/infer/region_constraints/leak_check.rs

@@ -100,6 +100,7 @@ impl<'tcx> RegionConstraintCollector<'_, 'tcx> {
 struct LeakCheck<'me, 'tcx> {
     tcx: TyCtxt<'tcx>,
     universe_at_start_of_snapshot: ty::UniverseIndex,
+    /// Only used when reporting region errors.
     overly_polymorphic: bool,
     mini_graph: &'me MiniGraph<'tcx>,
     rcc: &'me RegionConstraintCollector<'me, 'tcx>,