Why is rust nightly required for WebAssembly?

[cosminm-affnd]

I've noticed that building WebAssembly requires rust nightly, which raises a risk when used in production.

Can you help me understand what features require nightly and whether there is a way to disable those and use stable. Failing that how can we reduce the risk of using rust nightly?

[welcome]

Hi! Thanks for opening your first issue here! 😄

[anlumo]

The feature that requires nightly is the thread pool, because it uses wasm threads.

[fzyzcjy]

You can try to disable nightly and see which exact lines of code errors, and then maybe we can discuss whether to be disabled.

In addition, I also originally thought nightly is very dangerous and refuse to use it. But later iirc (not remember very clearly) some people on Rust forum discussed nightly is quite safe, and I used it and it works well.