* bug#69919: Inaccurate api-procedures manual sentence on lambda formal arguments
@ 2024-03-20 17:40 Richard Sent
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From: Richard Sent @ 2024-03-20 17:40 UTC (permalink / raw)
To: 69919
Hi Guile,
I noticed the following line in the manual on (lambda) in (info "(guile)
Lambda"). Emphasis in **.
> -- syntax: lambda formals body
> ...
> ‘(VARIABLE1 ... VARIABLEN . VARIABLEN+1)’
> If a space-delimited period precedes the last variable, then
> the procedure takes N or more variables where N is the number
> of formal arguments before the period. *There must be at
> least one argument before the period.*
That would mean a procedure like
--8<---------------cut here---------------start------------->8---
((lambda ( . args)
args) 1) ;=>(1) runs fine in 3.0.9
--8<---------------cut here---------------end--------------->8---
is invalid because there isn't an argument before the period. I've
encountered Guile code that relies on this behavior before, even in the
Guile repo. For example, in guile/benchmark/measure.scm:
--8<---------------cut here---------------start------------->8---
(define (measure . args)
...)
;; should be identical to
(define measure (lambda ( . args) ...))
--8<---------------cut here---------------end--------------->8---
Ergo, I think the sentence
> There must be at least one argument before the period
should be removed. This line seems to be from the R5RS standard [1], but
this sentence is in api-procedures.texi, not the R5RS manual, so I
assume it should reflect Guile's implementation.
[1] https://conservatory.scheme.org/schemers/Documents/Standards/R5RS/HTML/r5rs-Z-H-2.html#%_toc_%_sec_4.1.4
--
Take it easy,
Richard Sent
Making my computer weirder one commit at a time.
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