anchor.diff:          undefined ->
               format_stack_line(hd(ST));
           MFA ->
  -            format_stack_line(find(MFA, ST))
  +            format_stack_line(add_info(MFA, ST))
       end.
   
   format_stack_line({_M, F, A, I}) ->
  
positive.code:     };
  format_info(Failure, {abort, {generator_failed, {MFA, {E, R, ST}}}}) ->
      {
          color:yellow(format_case(Failure, [find(MFA, ST)])),
          [
              color:yellowb("Generator failed: "),
              io_lib:format("~n", []),
  
negative.code: ioindent(_Spacing, Other) ->
      Other.
  
  add_info(_MFA, [])                      -> [];
  add_info({M, F, A}, [{M, _, _, I}|_ST]) -> {M, F, A, I};
  add_info(MFA, [_Line|ST])               -> add_info(MFA, ST).
  