;;; PLT Scheme Inference Collection
;;; argument-lists.ss
;;; Copyright (c) 2006 M. Douglas Williams
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 2.1 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free
;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
;;; 02111-1307 USA.
;;;

(module argument-lists mzscheme
  
  (provide (all-defined))
  
  ;; argument-list-merge: list x list -> list
  ;; Merge two list of variables maintaining the order.
  (define (argument-list-merge list1 list2)
    (cond ((null? list2)
           list1)
          ((memq (car list2) list1)
           (argument-list-merge list1 (cdr list2)))
          (else
           (argument-list-merge
            (append list1 (list (car list2))) (cdr list2)))))
  
  )