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-rw-r--r--src/libsync/sync/mutex.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsync/sync/mutex.rs b/src/libsync/sync/mutex.rs
index b37e2f3a45d..2bd85526e68 100644
--- a/src/libsync/sync/mutex.rs
+++ b/src/libsync/sync/mutex.rs
@@ -143,6 +143,7 @@ pub struct StaticMutex {
 
 /// An RAII implementation of a "scoped lock" of a mutex. When this structure is
 /// dropped (falls out of scope), the lock will be unlocked.
+#[must_use]
 pub struct Guard<'a> {
     priv lock: &'a mut StaticMutex,
 }