From 598c34f45b9f53561d1b53dd11392418136c1dc0 Mon Sep 17 00:00:00 2001
From: Jack Wrenn <jack@wrenn.fyi>
Date: Tue, 26 Jul 2022 18:24:01 -0400
Subject: [PATCH] subscriber: impl `LookupSpan` for `Box<LS>` and `Arc<LS>`
 (#2247)

These implementations mirror those provided by tracing-core for
`Subscriber` on `Box<S>` and `Arc<S>`.
---
 tracing-subscriber/src/layer/mod.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tracing-subscriber/src/layer/mod.rs b/tracing-subscriber/src/layer/mod.rs
index 24b8533234..5122559ce5 100644
--- a/tracing-subscriber/src/layer/mod.rs
+++ b/tracing-subscriber/src/layer/mod.rs
@@ -685,7 +685,7 @@ use core::any::TypeId;
 
 feature! {
     #![feature = "alloc"]
-    use alloc::boxed::Box;
+    use alloc::{vec::Vec, boxed::Box};
     use core::ops::{Deref, DerefMut};
 }
 
@@ -1568,8 +1568,6 @@ where
 
 feature! {
     #![any(feature = "std", feature = "alloc")]
-    #[cfg(not(feature = "std"))]
-    use alloc::vec::Vec;
 
     macro_rules! layer_impl_body {
         () => {