error[E0597]: `FOO` does not live long enough
  --> $DIR/issue-17954.rs:20:13
   |
LL |     let a = &FOO;
   |             ^^^^ borrowed value does not live long enough
...
LL | }
   | - `FOO` dropped here while still borrowed
   |
   = note: borrowed value must be valid for the static lifetime...

error: aborting due to previous error

For more information about this error, try `rustc --explain E0597`.