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improve printer's handling of cyclic lists (#2111, #2635)

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This commit is contained in:
Mark Thom
2025-08-22 18:55:32 -07:00
parent 02b8a6010c
commit b14bda310f
2 changed files with 17 additions and 35 deletions
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9
src/heap_iter.rs
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@@ -420,6 +420,12 @@ impl<'a, ElideLists: ListElisionPolicy> StackfulPreOrderHeapIter<'a, ElideLists>
let loc = IterStackLoc::iterable_loc(vh, HeapOrStackTag::Heap);
self.forward_if_referent_marked(loc);
if self.read_cell(h).get_forwarding_bit() {
self.stack.push(h);
continue;
}
self.push_if_unmarked(loc);
self.stack.push(IterStackLoc::pending_mark_loc(vh + 1, HeapOrStackTag::Heap));
@@ -2138,9 +2144,6 @@ mod tests {
list_loc_as_cell!(1)
);
assert_eq!(iter.next().unwrap(), cyclic_link);
assert_eq!(iter.next().unwrap(), cyclic_link);
assert_eq!(iter.next().unwrap(), cyclic_link);
assert_eq!(iter.next(), None);
}