- given: an installed Rust program obnam-benchmark
  impl:
    rust:
      function: install_rust_program

- then: JSON files {first} and {second} match
  impl:
    rust:
      function: json_files_match

- then: file {filename} is valid JSON
  impl:
    rust:
      function: file_is_valid_json

- then: file {filename} is at least {number:int} bytes long
  impl:
    rust:
      function: file_is_at_least_this_long