From 4a6b1562b5541af7402f7a372b0ad6ee37203a25 Mon Sep 17 00:00:00 2001
From: Jiahao XU <Jiahao_XU@outlook.com>
Date: Fri, 12 Apr 2024 23:03:36 +1000
Subject: [PATCH] Update document for std::io::Error::downcast

---
 library/std/src/io/error.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/library/std/src/io/error.rs b/library/std/src/io/error.rs
index 4e1d7c2ac65..8bd11911fb1 100644
--- a/library/std/src/io/error.rs
+++ b/library/std/src/io/error.rs
@@ -852,15 +852,15 @@ pub fn into_inner(self) -> Option<Box<dyn error::Error + Send + Sync>> {
         }
     }
 
-    /// Attempt to downcast the inner error to `E` if any.
+    /// Attempt to downcast the custom boxed error to `E`.
     ///
-    /// If this [`Error`] was constructed via [`new`] then this function will
-    /// attempt to perform downgrade on it, otherwise it will return [`Err`].
+    /// If this [`Error`] when this contains a custom boxed error,
+    /// then it would attempt downcasting on the boxed error,
+    /// otherwise it will return [`Err`].
     ///
-    /// If the downcast succeeds, it will return [`Ok`], otherwise it will also
-    /// return [`Err`].
+    /// If the custom boxed error has the same type as `E`, it will return [`Ok`],
+    /// otherwise it will also return [`Err`].
     ///
-    /// [`new`]: Error::new
     ///
     /// # Examples
     ///