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e7350baf1e
* module/srfi/srfi-31.scm: Use `#:export' instead of `#:export-syntax'.
(rec): Rewrite using `syntax-rules'.
* test-suite/tests/srfi-31.test ("rec special form"): Change exception
type to EXCEPTION:SYNTAX-PATTERN-UNMATCHED.
33 lines
1.3 KiB
Scheme
33 lines
1.3 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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(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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