Detect when a lifetime is being reused in suggestion

compiler/rustc_infer/messages.ftl

@@ -164,7 +164,10 @@ infer_label_bad = {$bad_kind ->
 infer_lf_bound_not_satisfied = lifetime bound not satisfied
 infer_lifetime_mismatch = lifetime mismatch
 
-infer_lifetime_param_suggestion = consider introducing a named lifetime parameter{$is_impl ->
+infer_lifetime_param_suggestion = consider {$is_reuse ->
+    [true] reusing
+    *[false] introducing
+} a named lifetime parameter{$is_impl ->
     [true] {" "}and update trait if needed
     *[false] {""}
 }

compiler/rustc_infer/src/errors/mod.rs

@@ -517,6 +517,7 @@ impl Subdiagnostic for AddLifetimeParamsSuggestion<'_> {
                 Applicability::MaybeIncorrect,
             );
             diag.arg("is_impl", is_impl);
+            diag.arg("is_reuse", !introduce_new);
 
             true
         };