{ "shell":
  { "type": ["@", "rules", "shell/test", "script"]
  , "name": ["shell"]
  , "test": ["shell-script.sh"]
  , "keep": ["out/out.txt"]
  , "deps": [["", "tool-under-test"]]
  }
, "compile rules":
  {"type": "install", "files": {"RULES": "data/RULES.compiled"}}
, "compiled":
  { "type": ["@", "rules", "shell/test", "script"]
  , "name": ["compiled"]
  , "test": ["compiled.sh"]
  , "keep": ["graph.json", "out/out.txt"]
  , "deps": ["compile rules", ["", "tool-under-test"]]
  }
, "TESTS":
  { "type": ["@", "rules", "test", "suite"]
  , "stage": ["generated-binary"]
  , "deps": ["compiled", "shell"]
  }
}