| ;;; srfi-31.scm --- special form for recursive evaluation | |
| ;; Copyright (C) 2004, 2006, 2012 Free Software Foundation, Inc. | |
| ;; | |
| ;; 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| ;;; Original author: Rob Browning <[email protected]> | |
| (define-module (srfi srfi-31) | |
| #:export (rec)) | |
| (cond-expand-provide (current-module) '(srfi-31)) | |
| (define-syntax rec | |
| (syntax-rules () | |
| "Return the given object, defined in a lexical environment where | |
| NAME is bound to itself." | |
| ((_ (name . formals) body ...) ; procedure | |
| (letrec ((name (lambda formals body ...))) | |
| name)) | |
| ((_ name expr) ; arbitrary object | |
| (letrec ((name expr)) | |
| name)))) | |