anchor.diff:  
   get_attributes(L) ->
       erl_scan:attributes_info(L).
  +
  +%% vim: ft=erlang
  
positive.code: '*' '/' 'div' 'rem' 'band' 'and'
  '+' '-' 'bor' 'bxor' 'bsl' 'bsr' 'or' 'xor'
  '++' '--'
  '==' '/=' '=<' '<' '>=' '>' '=:=' '=/=' '<='
  '<<' '>>'
  '!' '=' '::' '..' '...'
  'spec' 'callback' % helper
  
negative.code: tuple
  %struct
  record_expr record_tuple record_field record_fields
  map_expr map_tuple map_field map_fields map_key
  if_expr if_clause if_clauses case_expr cr_clause cr_clauses receive_expr
  fun_expr fun_clause fun_clauses atom_or_var integer_or_var
  try_expr try_catch try_clause try_clauses
  