I just met a program that shows we do need mixing declartions:
(require (lib "plt-match.ss"))
(let ()
(match-define (list (cons 1 m) (cons 2 n)) (list (cons 1 2) (cons
2 3)))
(match-define (list (cons 1 r) (cons 2 s)) (list (cons 1 2.0)
(cons 2 3.0)))
(list (cons 1 (* m n)) (cons 2 (* r s))))
Running it gives:
define: not allowed in an expression context in: (define r #f)
Chongkai
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