FA-45938 / Bounded deques / Member archive

Unlink leaves the predecessor pointing at the detached node · case 03

Unlink leaves the predecessor pointing at the detached node.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Unlink one selected node from a finite doubly linked deque with sentinel S. Nodes are keyed by identity; return forward IDs, backward IDs, removed node links, size, sentinel endpoint links and reciprocal-link validity. Every input ID is unique.

Why this case matters

Controlled bounded deque implementation model with explicit storage and lifecycle observations.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
middle unlink	`[[3, 4], [5, 3], [null, null], 2, [5, 3], false]`	`[[3, 5], [5, 3], [null, null], 2, [5, 3], true]`	Failed

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