Generic swap

editable example

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ghul

use IO.Std.write_line

swap[T](left: T ref, right: T ref) is

(left!, right!) = (right!, left!)

si

let a mut = 1

let b mut = 2

swap(a ref, b ref)

write_line("ints: {a} {b}")

let s mut = "first"

let t mut = "second"

swap(s ref, t ref)

write_line("strings: {s} {t}")

let p mut = (1, "one")

let q mut = (2, "two")

swap(p ref, q ref)

write_line("tuples: {p} {q}")

ints:    2 1
strings: second first
tuples:  (2, two) (1, one)