const golang.org/x/sys/unix.LOCK_UN

2 uses

	golang.org/x/sys/unix (current package)
		zerrors_darwin_amd64.go#L895: 	LOCK_UN                           = 0x8

	github.com/go-git/go-billy/v5/osfs
		os_posix.go#L22: 	return unix.Flock(int(f.File.Fd()), unix.LOCK_UN)