* bug#67580: 29.1; Anomaly in cl-destructuring-bind &rest handling
@ 2023-12-02 0:38 Lassi Kortela
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From: Lassi Kortela @ 2023-12-02 0:38 UTC (permalink / raw)
To: 67580
;; These three return the first value to which `a' was bound, which is
;; probably OK.
(cl-destructuring-bind (a &rest a) (list 1 2 3 4)
a)
;; => 1
(cl-destructuring-bind (b a &rest a) (list 1 2 3 4)
a)
;; => 2
(cl-destructuring-bind (a b &rest b) (list 1 2 3 4)
a)
;; => 1
;; These two produce the anomaly. When the &rest parameter has the
;; same variable same as a positional parameter, and there are at
;; least two positional parameters, then &rest tries to decode the
;; list tail from whatever value was first assigned to the variable by
;; a positional parameter.
(cl-destructuring-bind (a b &rest a) (list 1 2 3 4)
a)
;; error: (wrong-type-argument listp 1)
(cl-destructuring-bind (a a &rest a) (list 1 2 3 4)
a)
;; error: (wrong-type-argument listp 1)
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2023-12-02 0:38 bug#67580: 29.1; Anomaly in cl-destructuring-bind &rest handling Lassi Kortela
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