error[E0713]: borrow may still be in use when destructor runs
  --> $DIR/issue-53773.rs:41:22
   |
LL |         members.push(child.raw);
   |                      ^^^^^^^^^
LL |
LL |     }
   |     - here, drop of `child` needs exclusive access to `*child.raw`, because the type `C<'_>` implements the `Drop` trait
LL |     members.len();
   |     ------- borrow later used here
   |
   = note: consider using a `let` binding to create a longer lived value

error: aborting due to previous error

For more information about this error, try `rustc --explain E0713`.