Prefer to_string() to format!()

src/librustc_codegen_llvm/back/archive.rs

@@ -149,7 +149,7 @@ impl<'a> ArchiveBuilder<'a> {
         // Ignoring obj file starting with the crate name
         // as simple comparison is not enough - there
         // might be also an extra name suffix
-        let obj_start = format!("{}", name);
+        let obj_start = name.to_owned();
 
         self.add_archive(rlib, move |fname: &str| {
             // Ignore bytecode/metadata files, no matter the name.

src/librustc_codegen_llvm/back/link.rs

@@ -810,7 +810,7 @@ fn link_natively(sess: &Session,
                 }
             };
 
-            linker_error.note(&format!("{}", e));
+            linker_error.note(&e.to_string());
 
             if !linker_not_found {
                 linker_error.note(&format!("{:?}", &cmd));