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Subject: |
doc. error in v 2.0.11, Section 7.6.2.5 |
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Date: |
Sun, 19 Apr 2015 19:20:57 -0700 |
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
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--- Begin Message ---
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Subject: |
Re: bug#20375: doc. error in v 2.0.11, Section 7.6.2.5 |
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Date: |
Thu, 23 Jun 2016 22:07:26 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
On Mon 20 Apr 2015 04:20, Matt Wette <address@hidden> writes:
> 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)
Gah, you're right. What a mess. Fixed in master, will backport
soonish.
Andy
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