`.eval_async()` under `tokio::spawn` about mlua HOT 4 CLOSED

Could you try to use tokio::task::spawn_local instead of tokio::spawn?

Update: you probably could also require to make mlua::Lua 'static, this can be done by calling into_static method.

from mlua.

Oh wow, thank you for the quick response!

Update: you probably could also require to make mlua::Lua 'static, this can be done by calling into_static method.

This doesn't seem to make a difference. Rust still complains about Result, and also:

note: captured value is not `Send`
   --> src\server.rs:80:23
    |
80  |             eval_task(lua, eval_rx, notify_tx.clone()).await;
    |                       ^^^ has type `&mlua::Lua` which is not `Send`

I've double-checked my features:

mlua = { version = "0.5.4", features = ["lua54", "vendored", "serde", "send", "async"] 

Could you try to use tokio::task::spawn_local instead of tokio::spawn?

This, on the other hand, does work! It does mean that most of the app needs to run on a single thread, but to be honest I'm not too concerned about that. I imagine it'll be possible to minimize the part that does. I've managed to actually implement the functionality I tried to when I hit this issue, so can happily say this is now resolved. Thank you for your help!

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You're getting error because &mlua::Lua type does not implement Send. This is because mlua::Lua is not Sync (but Send if feature = "send" enabled).
Unfortunately it's hard to make Lua Sync and provide true parallelism :(

I'm glad that your problem solved.

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Ooh, Sync vs Send. I never properly learned Rust parallelism, missed that distinction. Thank you for unconfusing me on that :)

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