FA-11528 / Static analysis soundness / Member archive
Unreachable input becomes an unknown constant at a join · case 03
Unreachable input becomes an unknown constant at a join.
Case contract
Join constant states encoded as strings B (unreachable), T (unknown), or integer constants; return the least upper bound.
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 |
|---|---|---|---|
| bottom identity left | "T" | 3 | Failed |
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