old_contents: from os.path import dirname, realpath
  import sys
  from test import JAVA_SUITES, INTERPRETERS, run_suites, run_suite
  import test
  
  test.REPO_DIR = dirname(realpath(__file__))
  
  SWIFT_SUITES = JAVA_SUITES
  
  def java_to_swift_interpreter(interpreter):
  	if interpreter.language == 'java':
  		interpreter.language = 'swift'
  		interpreter.args = ['.build/debug/slox']
  	return interpreter
  
  INTERPRETERS = {name: java_to_swift_interpreter(interpreter) for (name, interpreter) in INTERPRETERS.items()}
  
  def main():
    if len(sys.argv) < 2 or len(sys.argv) > 3:
      print('Usage: test.py <interpreter> [filter]')
      sys.exit(1)
  
    if len(sys.argv) == 3:
      filter_path = sys.argv[2]
  
    if sys.argv[1] == 'all':
      run_suites(sorted(INTERPRETERS.keys()))
    elif sys.argv[1] == 'c':
      run_suites(C_SUITES)
    elif sys.argv[1] == 'swift':
      run_suites(SWIFT_SUITES)
    elif sys.argv[1] not in INTERPRETERS:
      print('Unknown interpreter "{}"'.format(sys.argv[1]))
      sys.exit(1)
  
    else:
      if not run_suite(sys.argv[1]):
        sys.exit(1)
  
  if __name__ == '__main__':
    main()
new_contents: #!/usr/bin/env python3
  
  from os.path import dirname, realpath
  import sys
  from test import JAVA_SUITES, INTERPRETERS, run_suites, run_suite
  import test
  
  test.REPO_DIR = dirname(realpath(__file__))
  
  SWIFT_SUITES = JAVA_SUITES
  
  def java_to_swift_interpreter(interpreter):
  	if interpreter.language == 'java':
  		interpreter.language = 'swift'
  		interpreter.args = ['.build/debug/slox']
  	return interpreter
  
  INTERPRETERS = {name: java_to_swift_interpreter(interpreter) for (name, interpreter) in INTERPRETERS.items()}
  
  def main():
    if len(sys.argv) < 2 or len(sys.argv) > 3:
      print('Usage: test.py <interpreter> [filter]')
      sys.exit(1)
  
    if len(sys.argv) == 3:
      filter_path = sys.argv[2]
  
    if sys.argv[1] == 'all':
      run_suites(sorted(INTERPRETERS.keys()))
    elif sys.argv[1] == 'c':
      run_suites(C_SUITES)
    elif sys.argv[1] == 'swift':
      run_suites(SWIFT_SUITES)
    elif sys.argv[1] not in INTERPRETERS:
      print('Unknown interpreter "{}"'.format(sys.argv[1]))
      sys.exit(1)
  
    else:
      if not run_suite(sys.argv[1]):
        sys.exit(1)
  
  if __name__ == '__main__':
    main()
subject: Add shebang to test_swift.py & make it executable