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Collapse the whole subject wire in materialized folds

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This commit is contained in:
Dennis Kobert
2026-08-22 19:11:48 +00:00
parent 7b993c5de6
commit a2918887f6
3 changed files with 21 additions and 63 deletions
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22
node-graph/nodes/gcore/src/record.rs
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@@ -1445,7 +1445,7 @@ mod tests {
}
#[test]
fn partial_fold_keeps_the_outer_level() {
fn fold_collapses_a_deeper_wire() {
let arena = Arena::new(1 << 16).unwrap();
let generations = [];
let scope = scope_fixture(&generations, &arena);
@@ -1457,7 +1457,7 @@ mod tests {
let (reverse_edge, reverse_layout) = lifted_value(false);
reserve_for(&[&base, &leveled_content, &count_layout, &reverse_layout]);
// Element = the outer copy, so each outer row folds to a distinct sum.
// Element = the outer copy, so the total fold sums across both copies.
let content = install(
RepeatOpacityNode::new(IndexSourceNode { layout: base.clone() }, ValueNode(3u32), &base),
repeat_opacity_layout_meta(),
@@ -1482,18 +1482,12 @@ mod tests {
let node = install(SumNode::new(nested, &two_level), sum_layout_meta(), &[Some(&two_level)]);
let out = Node::<ContextImpl>::layout(&node).clone();
assert_eq!(out.depth, 1, "the fold keeps the subject's outer level");
assert_eq!(node.extent_at(&ctx, 0), GPoll::Final(Extent::Exactly(2)), "the outer extent shifts down");
let head = ctx.index_head();
for (lane, expected) in [(0u64, 0.), (1, 3.)] {
let mark = stack::sp();
let GPoll::Final(value) = node.eval(&ctx.promoted(&head, lane)) else {
panic!("expected a final record");
};
assert_eq!(unsafe { out.rec(&value).element::<f64>() }, expected, "row {lane}");
unsafe { stack::rewind(mark) };
}
assert_eq!(out.depth, 0, "the fold consumes the whole wire");
let GPoll::Final(value) = node.eval(&ctx) else {
panic!("expected a final record");
};
// Two copies of three lanes, each lane the copy index: 0 * 3 + 1 * 3.
assert_eq!(unsafe { out.rec(&value).element::<f64>() }, 3.);
}
#[test]