wasm32-unknown-emscripten fall back

[JosiahParry]

I have read that rayon has a single threaded fallback for wasm32-unknown-unknown. However, I ran into an issue with compiling rayon to the wasm32-unknown-emscripten target. Is there a fallback for this target?

[cuviper]

Please provide details -- what issue did you encounter?

The fallback does not look at the particular target, just that creating a thread returns io::ErrorKind::Unsupported. If it fails for any other reason, rayon will pass that error through.