And it gets worse. P2900 doesn’t even support class invariants — they’re “deferred to a future proposal.” Eiffel had class invariants in 1988. The D language has had in/out/invariant contracts since 2001 — twenty-five years before C++26. As Sean Baxter, author of the Safe C++ proposal (P3390), put it: “Contracts check for bugs. They don’t prevent bugs. A bounds-checked access that traps is still a denial of service.” Baxter proposed an actual Rust-inspired borrow checker for C++. It wasn’t adopted.
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