error[E0597]: `factorial` does not live long enough
  --> $DIR/unboxed-closures-failed-recursive-fn-1.rs:15:17
   |
LL |     let f = |x: u32| -> u32 {
   |             --------------- capture occurs here
LL |         let g = factorial.as_ref().unwrap();
   |                 ^^^^^^^^^ borrowed value does not live long enough
...
LL | }
   | - borrowed value dropped before borrower
   |
   = note: values in a scope are dropped in the opposite order they are created

error[E0373]: closure may outlive the current function, but it borrows `factorial`, which is owned by the current function
  --> $DIR/unboxed-closures-failed-recursive-fn-1.rs:26:13
   |
LL |     let f = |x: u32| -> u32 {
   |             ^^^^^^^^^^^^^^^ may outlive borrowed value `factorial`
LL |         //~^ ERROR closure may outlive the current function, but it borrows `factorial`
LL |         let g = factorial.as_ref().unwrap();
   |                 --------- `factorial` is borrowed here
help: to force the closure to take ownership of `factorial` (and any other referenced variables), use the `move` keyword
   |
LL |     let f = move |x: u32| -> u32 {
   |             ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

Some errors occurred: E0373, E0597.
For more information about an error, try `rustc --explain E0373`.