⬆️ Update Rust crate once_cell to v1.21.4#12
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This PR contains the following updates:
1.21.3→1.21.4Release Notes
matklad/once_cell (once_cell)
v1.21.4Compare Source
Fix unsoundness in
OnceCell::waitunder--features=parking_lot, #295.If thread A calls
wait, while thread B callsget_or_try_init(f), and, furthermore,fpanics,the
waitincorrectly returns and thread A observes uninitialized memory.Kudos to @meng-xu-cs for a nice find!
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