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.
