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I would be very surprised if Rust doesn't target WebAssembly sometime in the future. It's just such a good fit. If I remember correctly there are already talks about doing MIR->WASM.

It's planned.

https://github.com/rust-lang/rust/issues/33205

We Rust folk have definitely got plans in this space. :)

If rust can be compiled to LLVM, then emscripten can be the backend to asm JS

The issue is emscripten uses a different LLVM version than we do; so it can work, but it's got some rough edges.

We want both compile to JS and compile to wasm to work well, the work just isn't done yet.