mirror of https://github.com/rust-lang/rust
25 lines
670 B
Rust
25 lines
670 B
Rust
//@ aux-build:block-on.rs
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//@ edition:2021
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//@ build-pass
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#![feature(async_closure)]
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extern crate block_on;
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fn force_fnonce<T: async FnOnce()>(t: T) -> T { t }
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fn main() {
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block_on::block_on(async {
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let x = 1i32;
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// `force_fnonce` pulls the closure's kind down to `FnOnce`,
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// which means that we don't treat the borrow of `x` as a
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// self-borrow (with `'env` lifetime). This leads to a lifetime
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// error which is solved by forcing the inner coroutine to
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// be `move` as well, so that it moves `x`.
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let c = force_fnonce(async move || {
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println!("{x}");
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});
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c().await;
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});
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}
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