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-rw-r--r--library/std/src/sync/mutex.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/library/std/src/sync/mutex.rs b/library/std/src/sync/mutex.rs
index 06a97fd3f76..0d844547376 100644
--- a/library/std/src/sync/mutex.rs
+++ b/library/std/src/sync/mutex.rs
@@ -162,7 +162,7 @@ use crate::sys_common::mutex as sys;
 /// assert_eq!(*res_mutex.lock().unwrap(), 800);
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(not(test), rustc_diagnostic_item = "mutex_type")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Mutex")]
 pub struct Mutex<T: ?Sized> {
     inner: sys::MovableMutex,
     poison: poison::Flag,