anchor.diff:  
   -spec handle_call(Request :: term(), From :: {Pid :: pid(), Tag :: any()},
   		State :: #state{}) ->
  -	Result :: {reply, Reply :: term(), NewState :: #state{}} 
  +	Result :: {reply, Reply :: term(), NewState :: #state{}}
   		| {reply, Reply :: term(), NewState :: #state{}, Timeout :: non_neg_integer() | infinity}
   		| {reply, Reply :: term(), NewState :: #state{}, hibernate}
   		| {noreply, NewState :: #state{}}
  
positive.code: %%% SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  %%% LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  %%% DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  %%% THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
  %%% (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  %%% OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  %%%
  
negative.code: %%% @end
  %%%
  %%% Copyright (c) 2011-2014, Motivity Telecom
  %%%
  %%% All rights reserved.
  %%%
  %%% Redistribution and use in source and binary forms, with or without
  %%% modification, are permitted provided that the following conditions
  %%% are met:
  %%%
  %%%    - Redistributions of source code must retain the above copyright
  %%%      notice, this list of conditions and the following disclaimer.
  %%%    - Redistributions in binary form must reproduce the above copyright
  %%%      notice, this list of conditions and the following disclaimer in
  %%%      the documentation and/or other materials provided with the
  %%%      distribution.
  %%%    - Neither the name of Motivity Telecom nor the names of its
  %%%      contributors may be used to endorse or promote products derived
  