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Unreachable predecessors erase definite assignments · case 03

Unreachable predecessors erase definite assignments.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Predecessors are None (unreachable) or lists of definitely assigned variables. Return their reachable intersection sorted; return None when no predecessor is reachable.

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
dead predecessor ignored	`[]`	`["v3"]`	Failed

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