error[E0521]: borrowed data escapes outside of closure
  --> $DIR/issue-78262.rs:12:26
   |
LL |     let f = |x: &dyn TT| x.func();
   |              -           ^^^^^^^^ `x` escapes the closure body here
   |              |
   |              `x` is a reference that is only valid in the closure body

error: aborting due to previous error

For more information about this error, try `rustc --explain E0521`.