File: constrained-but-no-upvars-yet.rs

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rustc 1.85.0%2Bdfsg3-1
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//@ edition: 2021
//@ build-pass
//@ revisions: current next
//@ ignore-compare-mode-next-solver (explicit revisions)
//@[next] compile-flags: -Znext-solver

fn constrain<T: AsyncFnOnce()>(t: T) -> T {
    t
}

fn call_once<T>(f: impl FnOnce() -> T) -> T {
    f()
}

async fn async_call_once<T>(f: impl AsyncFnOnce() -> T) -> T {
    f().await
}

fn main() {
    let c = constrain(async || {});
    call_once(c);

    let c = constrain(async || {});
    async_call_once(c);
}