From 19bc0a8c674788539e0d93d072517ea3d7d9a998 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 10 Oct 2019 12:42:04 +0300
Subject: [PATCH] Mark Path::join as must_use

I've accidentally did `mut_path_buf.jon(a_path);`, expecting this to be an in-place modification. Seems like we can easily warn in such cases?
---
 src/libstd/path.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index fd6ff1032bb..c8487ad75fe 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -2219,6 +2219,7 @@ impl Path {
     /// assert_eq!(Path::new("/etc").join("passwd"), PathBuf::from("/etc/passwd"));
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
+    #[must_use]
     pub fn join<P: AsRef<Path>>(&self, path: P) -> PathBuf {
         self._join(path.as_ref())
     }