FA-11522 / Static analysis soundness / Member archive

A call preserves a constant for a modified global · case 02

A call preserves a constant for a modified global.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Environment maps globals to integer constants or None for unknown. Summary is None for unknown effects or a list of may-written globals. Return environment with affected existing bindings set to None.

Why this case matters

A deterministic offline analysis model exposing a specific soundness or precision boundary; it does not implement a complete language analyzer.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
known writer	`{"a": 2, "b": 2}`	`{"a": null, "b": 2}`	Failed

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

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