old_contents: #!/bin/python
  
  import sys
  import re
  
  data = sys.stdin.readlines()
  
  errs = []
  for line in data:
    if re.search(r'error.cc', line):
      line = line.partition('error.cc:')[-1]
      line = re.sub(r'\d+] ', r'', line)
      line = line.strip().split()
      err = line[0].strip(":")
      if line[1] == "create":
        assert(err not in errs)
        errs.append(err)
      elif line[0] == "realloc":
        errs.remove(line[1])
        errs.append(line[3])
      elif line[1] == "1" and line[3] == "0":
        # print line
        # print err, errs
        assert(err in errs)
        errs.remove(err)
  
  print "leaked:", errs
  
new_contents: #!/usr/bin/env python2.7
  #
  # Copyright 2017 gRPC authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # Reads stdin to find error_refcount log lines, and prints reference leaks
  # to stdout
  
  # usege: python error_ref_leak < logfile.txt
  
  import sys
  import re
  
  data = sys.stdin.readlines()
  
  errs = []
  for line in data:
    # if we care about the line
    if re.search(r'error.cc', line):
      # str manip to cut off left part of log line
      line = line.partition('error.cc:')[-1]
      line = re.sub(r'\d+] ', r'', line)
      line = line.strip().split()
      err = line[0].strip(":")
      if line[1] == "create":
        assert(err not in errs)
        errs.append(err)
      elif line[0] == "realloc":
        errs.remove(line[1])
        errs.append(line[3])
      # explicitly look for the last dereference 
      elif line[1] == "1" and line[3] == "0":
        assert(err in errs)
        errs.remove(err)
  
  print "leaked:", errs
  
subject: Add copyright and usage