FPF Reference

    C.3.A:B.1 What you get with typed assurance [I]

    Preface node heading:c-3-a-b-1-what-you-get-with-typed-assurance-i:40520

    What this page is

    This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

    Methodology

    Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

    Content

    • Targeted proofs (VA). If a policy says “for every PassengerCar …” (notation hint: ∀x:PassengerCar), the VA lane now has a clear target. You can prove obligations once for the kind (and its subkinds), instead of re‑proving per ad‑hoc label.
    • Subkind‑aware test plans (LA). Test matrices are indexed by subkinds (and RoleMasks) × context slices; coverage stops being accidental.
    • Deterministic guards. A test/proof either applies to the TargetSlice and Kind (Scope covers & MemberOf defined) or it doesn’t. No “latest,” no silent widening.
    • Clean tool boundaries (TA). You qualify the prover/model‑checker/classifier once and route tool confidence to TA, not to “broadened” claims.

    Last Updated: 2026-06-17 — upstream FPF commit 646b0b9b (github.com/ailev/FPF)