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// { "preopens": { "/scratch": "scratch" } }
fn main() {  let old_path = "/scratch/old_file";  let new_path = "/scratch/new_file";
  assert!(std::fs::write(old_path, b"Hello, world!").is_ok());  assert!(std::fs::rename(old_path, new_path).is_ok());  assert!(std::fs::read(old_path).is_err());  assert_eq!(std::fs::read(new_path).unwrap(), b"Hello, world!");}