Nothing
suppressPackageStartupMessages(library(dequer))
n <- 3
m <- 4
dl <- deque()
for (i in 1:n) push(dl, i)
dl2 <- deque()
for (i in 1:m) push(dl2, i)
combine(dl, dl2)
l <- as.list(dl)
truth <- list(3, 2, 1, 4, 3, 2, 1)
stopifnot(all.equal(l, truth))
invisible({rm(dl, dl2);gc()})
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