ref: 7aac15b2bfcc5eec279aa14f9f199685f9d7e0d9 dir: /lib/std/swap.myr/
pkg std = generic swap : (a : @a#, b : @a# -> void) ;; generic swap = {a : @a#, b : @a# var t t = a# a# = b# b# = t }