chore: add more `Debug` impls to `embassy-sync`, particularly on `OnceLock`

All tests green

1 files changed, 1 insertions, 0 deletions

diff --git a/embassy-sync/src/blocking_mutex/mod.rs b/embassy-sync/src/blocking_mutex/mod.rs
index a41bc3569..11809c763 100644
--- a/embassy-sync/src/blocking_mutex/mod.rs
+++ b/embassy-sync/src/blocking_mutex/mod.rs
@@ -22,6 +22,7 @@ use self::raw::RawMutex;
 ///
 /// In all cases, the blocking mutex is intended to be short lived and not held across await points.
 /// Use the async [`Mutex`](crate::mutex::Mutex) if you need a lock that is held across await points.
+#[derive(Debug)]
 pub struct Mutex<R, T: ?Sized> {
     // NOTE: `raw` must be FIRST, so when using ThreadModeMutex the "can't drop in non-thread-mode" gets
     // to run BEFORE dropping `data`.