rust/tests/ui/generator/reborrow-mut-upvar.rs

// run-pass

#![feature(generators)]

fn _run(bar: &mut i32) {
    || { //~ WARN unused generator that must be used
        {
            let _baz = &*bar;
            yield;
        }

        *bar = 2;
    };
}

fn main() {}
Add `// run-pass` to collection of tests. 2018-09-06 14:41:12 +02:00			`// run-pass`

Adds support for immovable generators. Move checking of invalid borrows across suspension points to borrowck. Fixes #44197, #45259 and #45093. 2017-10-07 16:36:28 +02:00			`#![feature(generators)]`

			`fn _run(bar: &mut i32) {`
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: \|\| {}; } ``` 2020-07-28 00:00:00 +00:00			`\|\| { //~ WARN unused generator that must be used`
Adds support for immovable generators. Move checking of invalid borrows across suspension points to borrowck. Fixes #44197, #45259 and #45093. 2017-10-07 16:36:28 +02:00			`{`
			`let _baz = &*bar;`
			`yield;`
			`}`

			`*bar = 2;`
			`};`
			`}`

			`fn main() {}`