error: unsatisfied lifetime constraints
  --> $DIR/issue-54124.rs:4:22
   |
LL | fn test<'a>() {
   |         -- lifetime `'a` defined here
LL |     let _:fn(&()) = |_:&'a ()| {}; //~ ERROR unsatisfied lifetime constraints
   |                      ^ - let's call the lifetime of this reference `'1`
   |                      |
   |                      requires that `'1` must outlive `'a`

error: unsatisfied lifetime constraints
  --> $DIR/issue-54124.rs:4:22
   |
LL | fn test<'a>() {
   |         -- lifetime `'a` defined here
LL |     let _:fn(&()) = |_:&'a ()| {}; //~ ERROR unsatisfied lifetime constraints
   |                      ^ requires that `'a` must outlive `'static`

error: aborting due to 2 previous errors