FA-4642 / Iterator consumption / Member archive

Callable iterator misses an equal but distinct sentinel · case 02

An equal sentinel stored in another object fails to stop iteration.

Member previewVariant 2 · 3 implementations · 4 checks per implementation

Case contract

Consume callable results until one compares equal to the sentinel. Equal but separately allocated lists terminate iteration; the sentinel is consumed, excluded from output, and later values remain unconsumed.

Why this case matters

A controlled local-runtime regression for collection APIs, language semantics, or ownership wrappers. Fixtures include boundary and interaction cases.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
equal separately allocated lists stop	`[[[1], [2], [3]], []]`	`[[[1]], [[3]]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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