
[;1m  process_flag(Pid, Flag, Value)[0m

  Sets certain flags for the process [;;4mPid[0m, in the same manner as [;;4m[0m
  [;;4mprocess_flag/2[0m. Returns the old value of the flag. The valid
  values for [;;4mFlag[0m are only a subset of those allowed in [;;4m[0m
  [;;4mprocess_flag/2[0m, namely [;;4msave_calls[0m.

  Failure: [;;4mbadarg[0m if [;;4mPid[0m is not a local process.
