error[E0597]: `stmt` does not live long enough --> $DIR/issue-54556-stephaneyfx.rs:27:21 | LL | let stmt = Statement; | ---- binding `stmt` declared here LL | let rows = Rows(&stmt); | ^^^^^ borrowed value does not live long enough LL | rows.map(|row| row).next() | ------------------- a temporary with access to the borrow is created here ... ... LL | } | - | | | `stmt` dropped here while still borrowed | ... and the borrow might be used here, when that temporary is dropped and runs the destructor for type `Map, {closure@$DIR/issue-54556-stephaneyfx.rs:28:14: 28:19}>` | = note: the temporary is part of an expression at the end of a block; consider forcing this temporary to be dropped sooner, before the block's local variables are dropped help: for example, you could save the expression's value in a new local variable `x` and then make `x` be the expression at the end of the block | LL | let x = rows.map(|row| row).next(); x | +++++++ +++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0597`.