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6.13.5 Binding multiple return values

Syntax: define-values formals expression

The expression is evaluated, and the formals are bound to the return values in the same way that the formals in a lambda expression are matched to the arguments in a procedure call.

(define-values (q r) (floor/ 10 3))
(list q r) ⇒ (3 1)

(define-values (x . y) (values 1 2 3))
x ⇒ 1
y ⇒ (2 3)

(define-values x (values 1 2 3))
x ⇒ (1 2 3)