Not an expert, but if you want a stable Rust-to-non-rust ABI, you can use the C ABI as the article mentions. If you want a stable rust-to-rust ABI for FFI there

Not an expert, but if you want a stable Rust-to-non-rust ABI, you can use the C ABI as the article mentions. If you want a stable rust-to-rust ABI for FFI there's a crate for that https://crates.io/crates/abi_stable https://crates.io/crates/abi_stable It seems somewhat unrealistic to expect a really new language commit across the board to the same sort of ABI stablility as a decades-old language such as C.