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// lists as [len, items...], items owned by the list
fn mklist(n) -> u
{
var l = new(n + 1);
l[0] = 0;
return l as u;
}
fn push(m l, d item) { l[l[0] + 1] = item as d; l[0] = l[0] + 1; return 0; }
fn sum(m l) { var s = 0, i = 1; while (i <= l[0]) { s += l[i][0]; i++; } return s; }
fn box(v) -> u { var b = new(1); b[0] = v; return b as u; }
fn consume(d b) { return b[0]; }
fn main()
{
var base = live_objects();
{
var l = mklist(8); // u from mklist arrives here as m
var i = 0;
while (i < 5) {
var b = box(i * 10); // m in the loop body
b as d; // give it down
push(l, b);
i++;
}
putn(sum(l)); putc(' ');
putn(live_objects() - base); putc(' '); // list + 5 boxes
}
putn(live_objects() - base); putc(' '); // freed at the block's end, children too
// u handed up one block by assignment, and as a block value
var outer;
{
var t = box(7);
t as u;
outer = t;
}
var v = { var w = box(8); w as u };
putn(outer[0] + v[0]); putc(' ');
// d given away to a callee
var g = box(99);
putn(consume(g as d)); putc(' ');
// containers: child takes its parent's tag
var p = new(2), c = new(1);
c[0] = 5;
p[0] = c;
p[1] = new(3);
putn(p[0][0]); putc(' ');
putn(live_objects() - base); putc(10);
return 0;
}
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