wai-bindgen-rust does not compile: error[E0277]: `RefCell<State>` cannot be shared between threads safely

[wellcaffeinated]

Hi there. I'm getting the following error when trying to compile my wapm package with the command:

RUSTFLAGS='-C target-feature=+atomics,+bulk-memory,+mutable-globals' \
    rustup run nightly-2023-05-31 \
    cargo build --target wasm32-wasi --release

   Compiling wai-bindgen-rust v0.2.3
error[E0277]: `RefCell<State>` cannot be shared between threads safely
  --> /Users/wellcaffeinated/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wai-bindgen-rust-0.2.3/src/futures.rs:72:34
   |
72 |         let waker = self.clone().into();
   |                                  ^^^^ `RefCell<State>` cannot be shared between threads safely
   |
   = help: within `PollingWaker`, the trait `Sync` is not implemented for `RefCell<State>`
   = note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
note: required because it appears within the type `PollingWaker`
  --> /Users/wellcaffeinated/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wai-bindgen-rust-0.2.3/src/futures.rs:22:8
   |
22 | struct PollingWaker {
   |        ^^^^^^^^^^^^
   = note: required for `std::task::Waker` to implement `From<Arc<PollingWaker>>`
   = note: required for `Arc<PollingWaker>` to implement `Into<std::task::Waker>`

error[E0277]: `(dyn Future<Output = ()> + 'static)` cannot be sent between threads safely
  --> /Users/wellcaffeinated/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wai-bindgen-rust-0.2.3/src/futures.rs:72:34
   |
72 |         let waker = self.clone().into();
   |                                  ^^^^ `(dyn Future<Output = ()> + 'static)` cannot be sent between threads safely
   |
   = help: the trait `Send` is not implemented for `(dyn Future<Output = ()> + 'static)`
   = note: required for `Unique<(dyn Future<Output = ()> + 'static)>` to implement `Send`
note: required because it appears within the type `Box<dyn Future<Output = ()>>`
  --> /rustc/f0411ffcebcd7f75ac02ed45feb53ffd07b75398/library/alloc/src/boxed.rs:195:12
note: required because it appears within the type `Pin<Box<dyn Future<Output = ()>>>`
  --> /rustc/f0411ffcebcd7f75ac02ed45feb53ffd07b75398/library/core/src/pin.rs:410:12
note: required because it appears within the type `State`
  --> /Users/wellcaffeinated/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wai-bindgen-rust-0.2.3/src/futures.rs:26:6
   |
26 | enum State {
   |      ^^^^^
   = note: required for `RefCell<State>` to implement `Send`
note: required because it appears within the type `PollingWaker`
  --> /Users/wellcaffeinated/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wai-bindgen-rust-0.2.3/src/futures.rs:22:8
   |
22 | struct PollingWaker {
   |        ^^^^^^^^^^^^
   = note: required for `std::task::Waker` to implement `From<Arc<PollingWaker>>`
   = note: required for `Arc<PollingWaker>` to implement `Into<std::task::Waker>`

For more information about this error, try `rustc --explain E0277`.

[gfyrag]

Hi @wellcaffeinated !
Did you solve this problem?

[wellcaffeinated]

No unfortunately 😕

[gfyrag]

For information, this occur also using a plain cargo wasix build