review comments

src/librustc/middle/resolve_lifetime.rs

@@ -2912,7 +2912,7 @@ fn add_missing_lifetime_specifiers_label(
     ) {
         err.span_suggestion(
             span,
-            &format!("consider using the named lifetime `{}`", name),
+            "consider using the named lifetime",
             format!("&{} ", name),
             Applicability::MaybeIncorrect,
         );

src/test/ui/suggestions/return-without-lifetime.stderr

@@ -2,7 +2,7 @@ error[E0106]: missing lifetime specifier
   --> $DIR/return-without-lifetime.rs:3:34
    |
 LL | fn func1<'a>(_arg: &'a Thing) -> &() { unimplemented!() }
-   |                                  ^ help: consider using the named lifetime `'a`: `&'a`
+   |                                  ^ help: consider using the named lifetime: `&'a`
    |
    = help: this function's return type contains a borrowed value, but the signature does not say which one of `_arg`'s 2 lifetimes it is borrowed from
 
@@ -10,7 +10,7 @@ error[E0106]: missing lifetime specifier
   --> $DIR/return-without-lifetime.rs:5:35
    |
 LL | fn func2<'a>(_arg: &Thing<'a>) -> &() { unimplemented!() }
-   |                                   ^ help: consider using the named lifetime `'a`: `&'a`
+   |                                   ^ help: consider using the named lifetime: `&'a`
    |
    = help: this function's return type contains a borrowed value, but the signature does not say which one of `_arg`'s 2 lifetimes it is borrowed from