From: Matt Wette <mwette@alumni.caltech.edu>
To: 20375@debbugs.gnu.org
Cc: mwette@alumni.caltech.edu
Subject: bug#20375: doc. error in v 2.0.11, Section 7.6.2.5
Date: Sun, 19 Apr 2015 19:20:57 -0700 [thread overview]
Message-ID: <89A136F3-5E08-4BC7-BC7A-9021B65598ED@alumni.caltech.edu> (raw)
The reference manual for guile 2.0.11 has an error in Section 7.6.2.5 on rnrs lists. The statement "identical to the fold ..." is not quite correct. The section says:
fold-left combine nil list1 list2 . . . [Scheme Procedure] fold-right combine nil list1 list2 . . . [Scheme Procedure] These procedures are identical to the fold and fold-right procedures provided by SRFI-1. See Section 7.5.3.5 [SRFI-1 Fold and Map], page 556, for documentation.
In section 7.5.3.5, the manual says:
(fold cons ’() ’(1 2 3)) [...] (3 2 1)
But, fold-left does not work like fold: the arguments to the procedure to fold-left are reversed with respect to fold:.
guile i2.0.11correctly gives the following:
(fold-left cons '() '(1 2 3)) => (((() . 1) . 2) . 3)
(fold-left xcons '() '(1 2 3)) => (3 2 1)
Matt
next reply other threads:[~2015-04-20 2:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-20 2:20 Matt Wette [this message]
2016-06-23 20:07 ` bug#20375: doc. error in v 2.0.11, Section 7.6.2.5 Andy Wingo
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