avoid many `&str` to `String` conversions with `MultiSpan::push_span_label`

1 files changed, 4 insertions, 7 deletions

diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index 6d6667717f0..1bdc980bfaf 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -887,22 +887,19 @@ impl<'a> Parser<'a> {
         let mut first_note = MultiSpan::from(vec![initial_semicolon]);
         first_note.push_span_label(
             initial_semicolon,
-            "this `;` turns the preceding closure into a statement".to_string(),
+            "this `;` turns the preceding closure into a statement",
         );
         first_note.push_span_label(
             closure_spans.body,
-            "this expression is a statement because of the trailing semicolon".to_string(),
+            "this expression is a statement because of the trailing semicolon",
         );
         expect_err.span_note(first_note, "statement found outside of a block");
 
         let mut second_note = MultiSpan::from(vec![closure_spans.whole_closure]);
-        second_note.push_span_label(
-            closure_spans.whole_closure,
-            "this is the parsed closure...".to_string(),
-        );
+        second_note.push_span_label(closure_spans.whole_closure, "this is the parsed closure...");
         second_note.push_span_label(
             following_token_span,
-            "...but likely you meant the closure to end here".to_string(),
+            "...but likely you meant the closure to end here",
         );
         expect_err.span_note(second_note, "the closure body may be incorrectly delimited");