mirror of https://github.com/rust-lang/rust
42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
//@ edition:2018
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#![feature(async_closure)]
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use std::future::Future;
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// test the quality of annotations giving lifetimes names (`'1`) when async constructs are involved
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pub async fn async_fn(x: &mut i32) -> &i32 {
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let y = &*x;
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*x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
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y
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}
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pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
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(async move || {
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//~^ ERROR lifetime may not live long enough
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//~| ERROR temporary value dropped while borrowed
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let y = &*x;
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*x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
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y
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})()
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}
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pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future<Output=&i32> {
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(async move || -> &i32 {
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//~^ ERROR lifetime may not live long enough
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//~| ERROR temporary value dropped while borrowed
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let y = &*x;
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*x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
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y
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})()
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}
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pub fn async_block(x: &mut i32) -> impl Future<Output=&i32> {
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async move {
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let y = &*x;
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*x += 1; //~ ERROR cannot assign to `*x` because it is borrowed
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y
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}
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}
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fn main() {}
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