Implement elided_named_lifetimes lint

compiler/rustc_lint/src/lints.rs

@@ -2611,6 +2611,16 @@ pub(crate) struct ElidedLifetimesInPaths {
     pub subdiag: ElidedLifetimeInPathSubdiag,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(lint_elided_named_lifetime)]
+pub(crate) struct ElidedNamedLifetime {
+    #[label(lint_label_elided)]
+    pub elided: Span,
+    pub name: Symbol,
+    #[label(lint_label_named)]
+    pub named_declaration: Option<Span>,
+}
+
 #[derive(LintDiagnostic)]
 #[diag(lint_invalid_crate_type_value)]
 pub(crate) struct UnknownCrateTypes {