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rust/tests/ui/generator/issue-52398.stderr

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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
warning: unused generator that must be used
--> $DIR/issue-52398.rs:17:5
|
LL | / move || {
LL | | A.test(yield);
LL | | };
Tweak span for `#[must_use]` Do not point at whole statement, only at the expression (skip pointing at `;`)
2022-08-16 09:46:33 -05:00
| |_____^
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
|
= note: generators are lazy and do nothing unless resumed
bless ui tests
2022-09-18 10:55:36 -05:00
= note: `#[warn(unused_must_use)]` on by default
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
warning: unused generator that must be used
--> $DIR/issue-52398.rs:24:5
|
LL | / static move || {
LL | | yield *y.borrow();
LL | | return "Done";
LL | | };
Tweak span for `#[must_use]` Do not point at whole statement, only at the expression (skip pointing at `;`)
2022-08-16 09:46:33 -05:00
| |_____^
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
|
= note: generators are lazy and do nothing unless resumed
warning: 2 warnings emitted
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