code: def main() -> None:
      argv = sys.argv
      if len(argv) != 2:
          raise Exception(
              "Expecting exactly one filename argument (or -)"
          )
  
      r = FileCheckVarReplacer()
  
      input_filename = argv[1]
      if input_filename == "-":
          # Read from input, write to stdout.
          for line in sys.stdin:
              sys.stdout.write(
                  r.replace_instruction_names_for_line(line)
              )
          return 0
  
      with open(input_filename) as f:
          # Replace contents of `input_filename`.
          fd, fname = tempfile.mkstemp()
          with open(fd, "w") as out_f:
              for line in f:
                  out_f.write(
                      r.replace_instruction_names_for_line(line)
                  )
  
      shutil.move(fname, input_filename)
  
file_path: tensorflow/third_party/xla/xla/service/generate_test_hlo_checks.py
imports: import re
  import shutil
  import sys
  import tempfile
  from typing import Dict
label_desc: Use image node_id 2 for calling a global function with example usage: main() and returns: int