\section{Finding {\tt yacc} definitions}
<<*>>=
procedure rcsinfo () 
  return "$Id: yaccdefs.nw,v 1.18 2008/10/06 01:03:05 nr Exp nr $" ||
         "$Name: v2_12 $"
end
procedure main(args)
  go()
end

procedure postpass(name, arg)
  static kind
  case name of {
    "begin" : arg ? kind := tab(upto(' ')|0)
    "text" : if kind == "code" then arg ?
        if id := tab(many(&letters)) then {
          tab(many(' \t'))
          if =":" & any(&letters ++ ' ([{') then writedefn(id)
        }
  }
  return
end

procedure prepass(name, arg)
  if name == "end" then writedefn(&null) # force newline
end
