text: #!/usr/bin/python
  #
  # Run a provided command over all possible subsets of important
  # tor-rtcompat features.
  
  import sys, subprocess
  
  if sys.argv[1:] == []:
      print("You need to name a program to run with different features")
      sys.exit(1)
  
  FEATURES = [ "tokio", "async-std", "native-tls", "rustls" ]
  
  COMBINATIONS = [ [] ]
  
  # Generate all combinations of features.
  for feature in FEATURES:
      new_combinations = [ c + [ feature ] for c in COMBINATIONS ]
      COMBINATIONS.extend(new_combinations)
  
  for c in COMBINATIONS:
      arg = "--features={}".format(",".join(c))
      commandline = sys.argv[1:] + [arg]
      print(" ".join(commandline))
      subprocess.check_call(commandline)
  
  