anchor.diff:        Options :: options()).
   
   exprs(Es, I, Options) ->
  -    ?TEST(Es),
  +    ?EXPRS_TEST(Es),
       frmt({seq,[],[],[$,],lexprs(Es, options(Options))}, I, state(Options)).
   
   -spec(expr(Expression) -> io_lib:chars() when
  
positive.code: %-define(DEBUG, true).
  
  -ifdef(DEBUG).
  -define(TEST(T),
          %% Assumes that erl_anno has been compiled with DEBUG=true.
          %% erl_pp does not use the annoations, but test it anyway.
  
negative.code:       Options :: options()).
  
  form(Thing, Options) ->
      ?FORM_TEST(Thing),
      State = state(Options),
      frmt(lform(Thing, options(Options)), State).
  
  