Fix FileLock descriptor lifetime - #1662
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Fixes #1653.
Summary
FileinFileLockinstead of a raw descriptor.Why
FileLockcould outlive theFilefrom which it captured a raw descriptor. A later unlock could then operate on a closed or reused descriptor. The duplicated handle keeps the lock's descriptor valid for its full lifetime.Checks
cargo fmt --checkcargo metadata --no-deps --format-version 1