Auto merge of #88516 - matthiaskrgr:clippy_perf_end_august, r=jyn514,GuillaumeGomez

some low hanging clippy::perf fixes

2 files changed, 5 insertions, 3 deletions

diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index 45657f2d0f2..d7cd34c5922 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -2090,7 +2090,7 @@ impl<'tcx> LifetimeContext<'_, 'tcx> {
                                 self.is_unnamed(),
                                 self.is_underscore(),
                                 self.is_named(),
-                                sugg.starts_with("&"),
+                                sugg.starts_with('&'),
                             ) {
                                 (true, _, _, false) => (self.span_unnamed_borrow(), sugg),
                                 (true, _, _, true) => {
diff --git a/compiler/rustc_resolve/src/late/lifetimes.rs b/compiler/rustc_resolve/src/late/lifetimes.rs
index e901d4c00ab..4c1d537d55f 100644
--- a/compiler/rustc_resolve/src/late/lifetimes.rs
+++ b/compiler/rustc_resolve/src/late/lifetimes.rs
@@ -2605,8 +2605,10 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                     binding.ident,
                 );
                 self.with(scope, |_, this| {
-                    let scope =
-                        Scope::Supertrait { lifetimes: lifetimes.unwrap_or(vec![]), s: this.scope };
+                    let scope = Scope::Supertrait {
+                        lifetimes: lifetimes.unwrap_or_default(),
+                        s: this.scope,
+                    };
                     this.with(scope, |_, this| this.visit_assoc_type_binding(binding));
                 });
             } else {