Future from async closure has strange type name.

[theemathas]

Code:

fn main() {
    let f = async || {};
    println!("{}", std::any::type_name_of_val(&f()));
}

Output

playground::main::{{closure}}::{{closure}}<i16>

I know that there aren't any guarantees on the exact output format, but having a random <i16> seems rather confusing.

Meta

Reproducible on the playground with version 1.91.0-nightly (2025-08-18 9eb4a2652031ed5ba97c)