Rollup merge of #83526 - klensy:lazy-too, r=petrochenkov

lazily calls some fns

Replaced some fn's with it's lazy variants.

2 files changed, 6 insertions, 6 deletions

diff --git a/compiler/rustc_resolve/src/late.rs b/compiler/rustc_resolve/src/late.rs
index f9f33492a1e..1377bb781d0 100644
--- a/compiler/rustc_resolve/src/late.rs
+++ b/compiler/rustc_resolve/src/late.rs
@@ -2327,7 +2327,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
 
             ExprKind::Call(ref callee, ref arguments) => {
                 self.resolve_expr(callee, Some(expr));
-                let const_args = self.r.legacy_const_generic_args(callee).unwrap_or(Vec::new());
+                let const_args = self.r.legacy_const_generic_args(callee).unwrap_or_default();
                 for (idx, argument) in arguments.iter().enumerate() {
                     // Constant arguments need to be treated as AnonConst since
                     // that is how they will be later lowered to HIR.
diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index e85d78db22c..4c0df2701f5 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -184,7 +184,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                         PathResult::Module(ModuleOrUniformRoot::Module(module)) => module.res(),
                         _ => None,
                     }
-                    .map_or(String::new(), |res| format!("{} ", res.descr()));
+                    .map_or_else(String::new, |res| format!("{} ", res.descr()));
                 (mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)))
             };
             (
@@ -1042,10 +1042,10 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                 if let Some(span) = self.def_span(def_id) {
                     err.span_label(span, &format!("`{}` defined here", path_str));
                 }
-                let fields =
-                    self.r.field_names.get(&def_id).map_or("/* fields */".to_string(), |fields| {
-                        vec!["_"; fields.len()].join(", ")
-                    });
+                let fields = self.r.field_names.get(&def_id).map_or_else(
+                    || "/* fields */".to_string(),
+                    |fields| vec!["_"; fields.len()].join(", "),
+                );
                 err.span_suggestion(
                     span,
                     "use the tuple variant pattern syntax instead",