1 warning[E0713]: borrow may still be in use when destructor runs
2 --> $DIR/issue-45696-scribble-on-boxed-borrow.rs:52:5
4 LL | fn scribbled<'a>(s: Scribble<'a>) -> &'a mut u32 {
5 | -- lifetime `'a` defined here
7 | ^^^^^^^^^ returning this value requires that `*s.0` is borrowed for `'a`
10 | - here, drop of `s` needs exclusive access to `*s.0`, because the type `Scribble<'_>` implements the `Drop` trait
12 = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
13 = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
14 = note: for more information, try `rustc --explain E0729`
16 warning[E0713]: borrow may still be in use when destructor runs
17 --> $DIR/issue-45696-scribble-on-boxed-borrow.rs:63:5
19 LL | fn boxed_scribbled<'a>(s: Box<Scribble<'a>>) -> &'a mut u32 {
20 | -- lifetime `'a` defined here
22 | ^^^^^^^^^^^^ returning this value requires that `*s.0` is borrowed for `'a`
25 | - here, drop of `s` needs exclusive access to `*s.0`, because the type `Scribble<'_>` implements the `Drop` trait
27 = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
28 = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
29 = note: for more information, try `rustc --explain E0729`
31 warning[E0713]: borrow may still be in use when destructor runs
32 --> $DIR/issue-45696-scribble-on-boxed-borrow.rs:74:5
34 LL | fn boxed_boxed_scribbled<'a>(s: Box<Box<Scribble<'a>>>) -> &'a mut u32 {
35 | -- lifetime `'a` defined here
37 | ^^^^^^^^^^^^^ returning this value requires that `*s.0` is borrowed for `'a`
40 | - here, drop of `s` needs exclusive access to `*s.0`, because the type `Scribble<'_>` implements the `Drop` trait
42 = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
43 = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
44 = note: for more information, try `rustc --explain E0729`
46 error: compilation successful
47 --> $DIR/issue-45696-scribble-on-boxed-borrow.rs:81:1
52 LL | | let mut long_lived = Scribble(&mut x);
54 LL | | *boxed_boxed_scribbled(Box::new(Box::new(Scribble(&mut x)))) += 10;
58 error: aborting due to previous error
60 For more information about this error, try `rustc --explain E0713`.