how to pop result map[int]int from chanel?

[timi5691]

this is my code:

select {
rs := <- app.ch_djmap {
if rs.len >= 0 {
cell_to := rs.keys()[0]
app.djmaps[cell_to] = rs.clone()
for _, mut djmover in app.djmover_map {
if djmover.selected && djmover.cell_set_to == cell_to {
djmover.dest_cell2 = cell_to
djmover.visited_cells.clear()
}
}
}
}
}

it say can not copy map, use move() or clone(), then i edited my code to:
select {
rs := (<- app.ch_djmap).clone() {
if rs.len >= 0 {
cell_to := rs.keys()[0]
app.djmaps[cell_to] = rs.clone()
for _, mut djmover in app.djmover_map {
if djmover.selected && djmover.cell_set_to == cell_to {
djmover.dest_cell2 = cell_to
djmover.visited_cells.clear()
}
}
}
}
}
but it still not work
if i use try_pop(), it works. but document say shouldn't use this method.