rust private

Suggestion for 'static impl Trait return When encountering a named or anonymous sup requirement (for example, `&'a self`) and a `'static` impl Trait return type, suggest adding the `'_` lifetime constraing to the return type. Fix #43719, #51282. ``` error: cannot infer an appropriate lifetime --> $DIR/static-return-lifetime-infered.rs:17:16 | LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> { | ----------------------- this return type evaluates to the `'static` lifetime... LL | self.x.iter().map(|a| a.0) | ------ ^^^^ | | | ...but this borrow... | note: ...can't outlive the anonymous lifetime #1 defined on the method body at 16:5 --> $DIR/static-return-lifetime-infered.rs:16:5 | LL | / fn iter_values_anon(&self) -> impl Iterator<Item=u32> { LL | | self.x.iter().map(|a| a.0) LL | | } | |_____^ help: you can add a constraint to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the method body at 16:5 | LL | fn iter_values_anon(&self) -> impl Iterator<Item=u32> + '_ { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ```