A write below a slot that stores a value read from the same slot, such
as `s.c = s.c.p; s.c.i = 1` on a parameter, revisits the binding with
one more segment after the stored key on every turn. The cycle closure
only recognized segments added at the front of the path (`node =
node[key]`), so the work-list never terminated and exhausted the owned
worker heap (CodeMirror 5 `mode/stylus/stylus.js`).
Recognize a contiguous segment inserted after a stable base, check that
repeating it after that base can never be pruned, and escape through it
once, as the self-alias rule already does. Front insertions keep their
existing order and result.
Fixes#7130
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Kaoru0822