anchor.diff:  %% @see merge/3
   %% @see merge_files/3
   %% @see merge_sources/3
  -%% @see //stdlib/filename:find_src/2
  +%% @see //stdlib/filelib:find_source/2
   %% @see epp_dodger
   
   -spec merge_files(atom(), erl_syntax:forms(), [file:filename()], [option()]) ->
  
positive.code:     ok.
  
  find_src(Name, undefined) ->
      filename:find_src(filename(Name));
  find_src(Name, Rules) ->
      filename:find_src(filename(Name), Rules).
  
  %% file_type(filename()) -> {value, Type} | none
  
  
negative.code: %%
  %%     <dd>Specifies a list of rules for associating object files with
  %%     source files, to be passed to the function
  %%     `filelib:find_source/2'. This can be used to change the
  %%     way Igor looks for source files. If this option is not specified,
  %%     the default system rules are used. The first occurrence of this
  %%     option completely overrides any later in the option list.</dd>
  