FA-4164 / Sequence semantics / Member archive

Left rotation one · case 04

The operation returns a result or retained state that violates this contract: Move the first item to the end; empty input remains empty.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case scope

A controlled failure with recorded boundary checks.

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
nonadjacent duplicate and unsorted order	`["c", "b", "a", "b"]`	`["a", "b", "c", "b"]`	Failed

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

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