Debugging rust WASM? Source maps in wasm32-unknown-unknown

It was possible to get source maps in wasm32-unknown-emscripten, however this doesn't seem to be the case for wasm32-unknown-unknown, the less hacky way of doing WASM Rust.

Failing this, WASM supports comments, would it be possible to have Rust comments persisted into the WASM, to make debugging the raw Webassembly easier?