x <- 1
y <- 2
pack(x, y) # list(x = 1, y = 2)
pack(a = x, y) # list(a = 1, y = 2)
pack(a = 5, y) # list(a = 5, y = 2)
pack(1, 2) # list('1' = 1, '2' = 2)
v <- pack(x = 8, y = 9) # list(x = 8, y = 9)
v -> unpack[x, y]
print(x) # 8
print(y) # 9
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