Could be neat if serde (and other libraries with proc macros) were able to ship WebAssembly blobs. Wasm blobs are portable and run with restricted capabilities.

Could be neat if serde (and other libraries with proc macros) were able to ship WebAssembly blobs. Wasm blobs are portable and run with restricted capabilities. Rustc could expose an embedded API to allow the wasm to generate code and expand macros without hitting the network.