That is correct. Remove directories "test/" and "cursor/test/", then run "go mod tidy"; you should see only one dependency in go.mod:

  require golang.org/x/sys v0.29.0

Could have used "syscall" in the standard library instead of "golang.org/x/sys/unix" if not for these: https://pkg.go.dev/golang.org/x/sys/unix#F_OFD_GETLK

... and this: https://go.googlesource.com/proposal/+/refs/heads/master/des...