Decide on bounds syntax for async closures (RFC 3668) · Issue #128129 · rust-lang/rust (original) (raw)

Prior to stabilization, we need to decide which syntax to use for async closure bounds. This was left as an open question in RFC 3668.

The main known candidates are:

• F: async FnMut() -> T
• F: AsyncFnMut() -> T

Other candidates discussed have included:

• F: async mut fn() -> T
• F: async mut () -> T
• F: async mut || -> T
• F: async fn(&mut self) -> T
• F: AsyncFn(&mut self) -> T
• F: async |&mut self| -> T

Tracking:

• Tracking issue for #![feature(async_closure)] (RFC 2394 / RFC 3668) #62290

@rustbot labels +T-lang +I-lang-nominated

cc @compiler-errors @rust-lang/lang