anchor.diff:      _ = is_list(Config),
       ok.
   
  +coverage(Config) when is_list(Config) ->
  +    %% Cover beam_dead.
  +    ok = coverage_1(x, a),
  +    ok = coverage_1(x, b).
  +
  +coverage_1(B, Tag) ->
  +    case Tag of
  +	a -> coverage_2(1, a, B);
  +	b -> coverage_2(2, b, B)
  +    end.
  +
  +coverage_2(1, a, x) -> ok;
  +coverage_2(2, b, x) -> ok.
  +
   id(I) -> I.
  
positive.code: all() -> 
      test_lib:recompile(?MODULE),
      [pmatch, mixed, aliases, match_in_call, untuplify,
       shortcut_boolean, letify_guard, selectify, underscore].
  
  groups() -> 
      [].
  
negative.code: 	 init_per_group/2,end_per_group/2,
  	 pmatch/1,mixed/1,aliases/1,match_in_call/1,
  	 untuplify/1,shortcut_boolean/1,letify_guard/1,
  	 selectify/1,underscore/1,coverage/1]).
  	 
  -include_lib("test_server/include/test_server.hrl").
  
  