From 94ca5e766895a7f8d57988d61f77cd079ca86429 Mon Sep 17 00:00:00 2001
From: Eliza Weisman <eliza@buoyant.io>
Date: Mon, 25 Oct 2021 09:36:27 -0700
Subject: [PATCH] subscriber: fix unused method warnings for `Extensions`
 (#1686)

## Motivation

Currently, there are some `pub(crate)` methods on the `Extensions`,
`ExtensionsMut`, and `ExtensionsInner` types that are only used when the
"registry" feature is enabled. However, the _types_ exist when the "std"
feature flag is enabled, so those methods produce unused method
warnings.

## Solution

This commit adds `#[cfg(feature = "registry")]` to those methods, fixing
the warning.
---
 tracing-subscriber/src/registry/extensions.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tracing-subscriber/src/registry/extensions.rs b/tracing-subscriber/src/registry/extensions.rs
index ea20d94095..899e1549f7 100644
--- a/tracing-subscriber/src/registry/extensions.rs
+++ b/tracing-subscriber/src/registry/extensions.rs
@@ -120,6 +120,7 @@ pub(crate) struct ExtensionsInner {
 
 impl ExtensionsInner {
     /// Create an empty `Extensions`.
+    #[cfg(any(test, feature = "registry"))]
     #[inline]
     #[cfg(any(test, feature = "registry"))]
     pub(crate) fn new() -> ExtensionsInner {