Rollup merge of #100940 - TaKO8Ki:do-not-suggest-adding-bound-to-opaque-type, r=fee1-dead

Do not suggest adding a bound to a opaque type

fixes #100442

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -281,6 +281,9 @@ impl<'tcx> BorrowExplanation<'tcx> {
         span: Span,
         region_name: &RegionName,
     ) {
+        if !span.is_desugaring(DesugaringKind::OpaqueTy) {
+            return;
+        }
         if let ConstraintCategory::OpaqueType = category {
             let suggestable_name =
                 if region_name.was_named() { region_name.name } else { kw::UnderscoreLifetime };