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Add SRFI 71: Extended LET-syntax for multiple values.

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* module/srfi/srfi-71.scm: New file.
* module/srfi/Makefile.am: Add it.
* doc/ref/srfi-modules.texi: Document it.
* NEWS: Update.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Christopher Allan Webber 2017-06-29 17:19:06 -05:00 • committed by Andy Wingo
parent 8a3cca464e
commit 26fc11a2ae
4 changed files with 300 additions and 3 deletions
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22
doc/ref/srfi-modules.texi
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@ -1,6 +1,6 @@
@c -*-texinfo-*-
@c This is part of the GNU Guile Reference Manual.
@c Copyright (C) 1996, 1997, 2000-2004, 2006, 2007-2014, 2017
@c Copyright (C) 1996, 1997, 2000-2004, 2006, 2007-2014, 2017, 2018
@c Free Software Foundation, Inc.
@c See the file guile.texi for copying conditions.
@ -58,6 +58,7 @@ get the relevant SRFI documents from the SRFI home page
* SRFI-64:: A Scheme API for test suites.
* SRFI-67:: Compare procedures
* SRFI-69:: Basic hash tables.
* SRFI-71:: Extended let-syntax for multiple values.
* SRFI-87:: => in case clauses.
* SRFI-88:: Keyword objects.
* SRFI-98:: Accessing environment variables.
@ -5400,6 +5401,25 @@ Answer a hash value appropriate for equality predicate @code{equal?},
@code{hash} is a backwards-compatible replacement for Guile's built-in
@code{hash}.
@node SRFI-71
@subsection SRFI-71 - Extended let-syntax for multiple values
@cindex SRFI-71
This SRFI shadows the forms for @code{let}, @code{let*}, and @code{letrec}
so that they may accept multiple values. For example:
@example
(use-modules (srfi srfi-71))
(let* ((x y (values 1 2))
(z (+ x y)))
(* z 2))
@result{} 6
@end example
See @uref{http://srfi.schemers.org/srfi-71/srfi-71.html, the
specification of SRFI-71}.
@node SRFI-87
@subsection SRFI-87 => in case clauses
@cindex SRFI-87