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edb6de0bec
* module/ice-9/boot-9.scm (%cond-expand-features): Remove redundant list of feature identifiers in the comment. Explain more clearly what belongs in this list. Remove srfi-6. * module/srfi/srfi-4.scm, module/srfi/srfi-27.scm, module/srfi/srfi-31.scm, module/srfi/srfi-38.scm, module/srfi/srfi-39.scm, module/srfi/srfi-42.scm, module/srfi/srfi-45.scm, module/srfi/srfi-67.scm: Add missing 'cond-expand-provide'. * module/srfi/srfi-69.scm: Fix erroneous 'cond-expand-provide'. * doc/ref/srfi-modules.texi (SRFI-0): Update the list of features in Guile core.
35 lines
1.4 KiB
Scheme
35 lines
1.4 KiB
Scheme
;;; srfi-31.scm --- special form for recursive evaluation
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;; Copyright (C) 2004, 2006, 2012 Free Software Foundation, Inc.
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;;
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;; This library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public
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;; License as published by the Free Software Foundation; either
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;; version 3 of the License, or (at your option) any later version.
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;;
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;; This library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this library; if not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Original author: Rob Browning <rlb@defaultvalue.org>
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(define-module (srfi srfi-31)
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#:export (rec))
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(cond-expand-provide (current-module) '(srfi-31))
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(define-syntax rec
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(syntax-rules ()
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"Return the given object, defined in a lexical environment where
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NAME is bound to itself."
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((_ (name . formals) body ...) ; procedure
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(letrec ((name (lambda formals body ...)))
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name))
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((_ name expr) ; arbitrary object
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(letrec ((name expr))
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name))))
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