error[E0507]: cannot move out of indexed content
  --> $DIR/issue-40402-1.rs:19:13
   |
19 |     let e = f.v[0];
   |             ^^^^^^
   |             |
   |             help: consider using a reference instead: `&f.v[0]`
   |             cannot move out of indexed content

error: aborting due to previous error