anchor.diff:  
   stats2stats([]) -> [];
   stats2stats([Stat|Stats]) ->
  -    Sz = tuple_size(#stats{}),
  +    Sz = record_info(size, stats),
       [stat2stat(Stat,Sz)|stats2stats(Stats)].
   
   stat2stat(Stat,Sz) when tuple_size(Stat) =:= Sz -> Stat;
  
positive.code: %%
  %% %CopyrightBegin%
  %%
  %% Copyright Ericsson AB 2010-2013. All Rights Reserved.
  %%
  %% Licensed under the Apache License, Version 2.0 (the "License");
  %% you may not use this file except in compliance with the License.
  
negative.code: 
  -record(stats, {
  	file  :: atom(),
  	line  :: non_neg_integer() | 'undefined',
  	tries :: non_neg_integer(),
  	colls :: non_neg_integer(),
  	time  :: non_neg_integer(), % us
  	nt    :: non_neg_integer(), % #timings collected
  	hist  :: tuple() | 'undefined'  % histogram
      }).
  
  -record(lock, {
  