anchor.diff:  
   format_map_pair(Op, K, V, Ctxt0) ->
       Ctxt1 = add_indent(Ctxt0, 1),
  -    Txt = format(K, set_class(Ctxt1, expr)),
  +    Txt = format(K, Ctxt1),
       Ctxt2 = add_indent(Ctxt0, width(Txt, Ctxt1)),
       [Txt,Op,format(V, Ctxt2)].
   
  
positive.code: format_funcs(Fs, Ctxt) ->
      format_vseq(Fs,
  		"", "",
  		set_class(Ctxt, def),
  		fun format_def/2).
  
  format_def({N,V}, Ctxt0) ->
      Ctxt1 = add_indent(set_class(Ctxt0, expr), Ctxt0#ctxt.body_indent),
      [format(N, Ctxt0),
       " =",
       nl_indent(Ctxt1)
  
negative.code:     ["#<", Val, ">(", format_hseq(Vs,",", Ctxt2, fun format/2), $)].
  
  format_clauses(Cs, Ctxt) ->
      format_vseq(Cs, "", "", Ctxt, fun format_clause/2).
  
  format_clause(Node, Ctxt) ->
      maybe_anno(Node, fun format_clause_1/2, Ctxt).
  