From 54855e44b4a91383314cf15e08bfed99362f9a9e Mon Sep 17 00:00:00 2001
From: Folyd <lyshuhow@gmail.com>
Date: Sat, 1 May 2021 10:23:44 +0800
Subject: [PATCH] core: impl `Value` for `&mut T` where `T: Value`

---
 tracing-core/src/field.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tracing-core/src/field.rs b/tracing-core/src/field.rs
index ae2b44dc2f..29d4709107 100644
--- a/tracing-core/src/field.rs
+++ b/tracing-core/src/field.rs
@@ -428,6 +428,19 @@ where
     }
 }
 
+impl<'a, T: ?Sized> crate::sealed::Sealed for &'a mut T where T: Value + crate::sealed::Sealed + 'a {}
+
+impl<'a, T: ?Sized> Value for &'a mut T
+where
+    T: Value + 'a,
+{
+    fn record(&self, key: &Field, visitor: &mut dyn Visit) {
+        // Don't use `(*self).record(key, visitor)`, otherwise would
+        // cause stack overflow due to `unconditional_recursion`.
+        T::record(self, key, visitor)
+    }
+}
+
 impl<'a> crate::sealed::Sealed for fmt::Arguments<'a> {}
 
 impl<'a> Value for fmt::Arguments<'a> {