ee = expect_equal
# -------------
# addleft.Deque
# -------------
d = deque(1, 2, 3)
ee(add(d, n = 0, n1 = 1), deque(1, 2, 3, n = 0, n1 = 1))
ee(addleft(d, n0 = 0, n1 = 1),
deque(n1 = 1, n0 = 0, 1, 2, 3))
d_was_not_touched = all.equal(d, as.deque(1:3))
expect_true(d_was_not_touched)
ref_addleft(d, 4)
ee(d, deque(4, 1, 2, 3))
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