{ "": {"type": "install", "tainted": ["test"], "deps": ["test-sampling"]}
, "test-sampling":
  { "type": ["@", "rules", "shell/test", "script"]
  , "name": ["sampling"]
  , "test": ["test_circle_sampling.sh"]
  , "deps": ["sample", "verify.py"]
  , "keep": ["sampled"]
  }
, "sample":
  { "type": "install"
  , "files": {"bin/sample": ["@", "cargo/circle", "", "circle_sampling"]}
  }
}