test_that("wrap works", {
v <- c(0, 0, 0)
set <- function(x) v[2] <<- x
f <- wrap(set, v[1] <<- v[1] + 1, v[3] <<- v[3] + 3)
expect_equal(v, c(0, 0, 0))
f(2)
expect_equal(v, 1:3)
})
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