diff --git a/compiler/rustc_codegen_ssa/src/back/archive.rs b/compiler/rustc_codegen_ssa/src/back/archive.rs
index d3cd085cfb6..66ec8f5f57d 100644
--- a/compiler/rustc_codegen_ssa/src/back/archive.rs
+++ b/compiler/rustc_codegen_ssa/src/back/archive.rs
@@ -203,7 +203,7 @@ impl<'a> ArchiveBuilder<'a> for ArArchiveBuilder<'a> {
             }
         }
 
-        self.src_archives.push((archive_path.to_owned(), archive_map));
+        self.src_archives.push((archive_path, archive_map));
         Ok(())
     }
 
diff --git a/compiler/rustc_log/src/lib.rs b/compiler/rustc_log/src/lib.rs
index 019fdc30dce..12d6281daad 100644
--- a/compiler/rustc_log/src/lib.rs
+++ b/compiler/rustc_log/src/lib.rs
@@ -98,7 +98,7 @@ pub fn init_env_logger(env: &str) -> Result<(), Error> {
             let fmt_layer = tracing_subscriber::fmt::layer()
                 .with_writer(io::stderr)
                 .without_time()
-                .event_format(BacktraceFormatter { backtrace_target: str.to_string() });
+                .event_format(BacktraceFormatter { backtrace_target: str });
             let subscriber = subscriber.with(fmt_layer);
             tracing::subscriber::set_global_default(subscriber).unwrap();
         }
diff --git a/compiler/rustc_parse_format/src/lib.rs b/compiler/rustc_parse_format/src/lib.rs
index 088a87ca571..34a4fd02ea6 100644
--- a/compiler/rustc_parse_format/src/lib.rs
+++ b/compiler/rustc_parse_format/src/lib.rs
@@ -847,9 +847,7 @@ impl<'a> Parser<'a> {
                 0,
                 ParseError {
                     description: "expected format parameter to occur after `:`".to_owned(),
-                    note: Some(
-                        format!("`?` comes after `:`, try `{}:{}` instead", word, "?").to_owned(),
-                    ),
+                    note: Some(format!("`?` comes after `:`, try `{}:{}` instead", word, "?")),
                     label: "expected `?` to occur after `:`".to_owned(),
                     span: pos.to(pos),
                     secondary_label: None,