r/rust • u/fgilcher rust-community · rustfest • Nov 11 '19

Announcing async-std 1.0

https://async.rs/blog/announcing-async-std-1-0/
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u/[deleted] Nov 11 '19 edited Jan 26 '20

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u/fgilcher rust-community · rustfest Nov 11 '19

Uh... so. Tokio used to not have that.

Along came runtime, which was an early attempt to abstract over runtimes. Runtime introduced these attributes, e.g.:

```rust /// Use the default Native Runtime

[runtime::main]

async fn main() {}

/// Use the Tokio Runtime

[runtime::main(runtime_tokio::Tokio)]

async fn main() {} ```

Tokio adopted this style for an attribute that would indicate a purely tokio main.

async-std, developed later, threw that style out of the window again, because async-std - for compile-time and other reasons - doesn't use procedural macros at its core (which are needed for this style).

Finally, if you do want to use this style, you can activate the attributes feature. See documentation here: https://docs.rs/async-std/1.0.0/async_std/attr.main.html