• BUFFER_SIZE : input_bunzip2 , output_bzip2
• getc_type_control : sub_context_ty
• getc_type_data : sub_context_ty
• INDENT : output_indent
• MAX_LINE_LEN : output_quoted_printable
• msg_dir_after : dir_functor
• msg_dir_before : dir_functor
• msg_file : dir_functor
• msg_special : dir_functor
• msg_symlink : dir_functor
• NO_TIME_SET : change_identifier_subset