FA-11495 / Static analysis soundness / Member archive
Joining branch intervals discards a reachable endpoint · case 05
Joining branch intervals discards a reachable endpoint.
Case contract
Join two integer closed intervals or None for unreachable; return a list enclosing their union, or None if both are unreachable.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| disjoint branches | [7, 5] | [0, 8] | Failed |
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