rust/tests/ui/nll/issue-48623-generator.rs

// run-pass
#![allow(path_statements)]
#![allow(dead_code)]

#![feature(generators, generator_trait)]

struct WithDrop;

impl Drop for WithDrop {
    fn drop(&mut self) {}
}

fn reborrow_from_generator(r: &mut ()) {
    let d = WithDrop;
    move || { d; yield; &mut *r }; //~ WARN unused generator that must be used
}

fn main() {}
Add `// run-pass` to collection of tests. 2018-09-06 07:41:12 -05:00			`// run-pass`
Add `#![allow(..)]` as necessary to get re-migrated run-pass tests compiling with clean stderr again. Most were added mechanically. 2018-09-25 16:51:35 -05:00			`#![allow(path_statements)]`
			`#![allow(dead_code)]`
Add `// run-pass` to collection of tests. 2018-09-06 07:41:12 -05:00
Access individual fields of tuples, closures and generators on drop. 2018-04-27 14:41:30 -05:00			`#![feature(generators, generator_trait)]`

			`struct WithDrop;`

			`impl Drop for WithDrop {`
			`fn drop(&mut self) {}`
			`}`

			`fn reborrow_from_generator(r: &mut ()) {`
			`let d = WithDrop;`
Make closures and generators a must use types Warn about unused expressions with closure or generator type. This follows existing precedence of must use annotations present on `FnOnce`, `FnMut`, `Fn` traits, which already indirectly apply to closures in some cases, e.g.,: ```rust fn f() -> impl FnOnce() { \|\| {} } fn main() { // an existing warning: unused implementer of `std::ops::FnOnce` that must be used: f(); // a new warning: unused closure that must be used: \|\| {}; } ``` 2020-07-27 19:00:00 -05:00			`move \|\| { d; yield; &mut *r }; //~ WARN unused generator that must be used`
Access individual fields of tuples, closures and generators on drop. 2018-04-27 14:41:30 -05:00			`}`

			`fn main() {}`