task: propagate attributes on task-locals (#4837)

Author: Arnavion

tokio/src/task/task_local.rs

@@ -51,6 +51,7 @@ macro_rules! task_local {
 #[macro_export]
 macro_rules! __task_local_inner {
     ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => {
+        $(#[$attr])*
         $vis static $name: $crate::task::LocalKey<$t> = {
             std::thread_local! {
                 static __KEY: std::cell::RefCell<Option<$t>> = const { std::cell::RefCell::new(None) };
@@ -66,6 +67,7 @@ macro_rules! __task_local_inner {
 #[macro_export]
 macro_rules! __task_local_inner {
     ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => {
+        $(#[$attr])*
         $vis static $name: $crate::task::LocalKey<$t> = {
             std::thread_local! {
                 static __KEY: std::cell::RefCell<Option<$t>> = std::cell::RefCell::new(None);