error[E0597]: `_thing1` does not live long enough --> $DIR/issue-54382-use-span-of-tail-of-block.rs:7:29 | LL | let mut _thing1 = D(Box::new("thing1")); | ----------- binding `_thing1` declared here ... LL | D("other").next(&_thing1) | ----------------^^^^^^^^- | | | | | borrowed value does not live long enough | a temporary with access to the borrow is created here ... ... LL | } | - `_thing1` dropped here while still borrowed LL | LL | ; | - ... and the borrow might be used here, when that temporary is dropped and runs the `Drop` code for type `D` | help: consider adding semicolon after the expression so its temporaries are dropped sooner, before the local variables declared by the block are dropped | LL | D("other").next(&_thing1); | + error: aborting due to previous error For more information about this error, try `rustc --explain E0597`.