error[E0597]: `a` does not live long enough
  --> $DIR/location-insensitive-scopes-issue-117146.rs:10:18
   |
LL |     let b = |_| &a;
   |             --- -^
   |             |   ||
   |             |   |borrowed value does not live long enough
   |             |   returning this value requires that `a` is borrowed for `'static`
   |             value captured here
...
LL | }
   | - `a` dropped here while still borrowed
   |
note: due to current limitations in the borrow checker, this implies a `'static` lifetime
  --> $DIR/location-insensitive-scopes-issue-117146.rs:20:22
   |
LL | fn bad<F: Fn(&()) -> &()>(_: F) {}
   |                      ^^^

error: implementation of `Fn` is not general enough
  --> $DIR/location-insensitive-scopes-issue-117146.rs:13:5
   |
LL |     bad(&b);
   |     ^^^^^^^ implementation of `Fn` is not general enough
   |
   = note: closure with signature `fn(&'2 ()) -> &()` must implement `Fn<(&'1 (),)>`, for any lifetime `'1`...
   = note: ...but it actually implements `Fn<(&'2 (),)>`, for some specific lifetime `'2`

error: implementation of `FnOnce` is not general enough
  --> $DIR/location-insensitive-scopes-issue-117146.rs:13:5
   |
LL |     bad(&b);
   |     ^^^^^^^ implementation of `FnOnce` is not general enough
   |
   = note: closure with signature `fn(&'2 ()) -> &()` must implement `FnOnce<(&'1 (),)>`, for any lifetime `'1`...
   = note: ...but it actually implements `FnOnce<(&'2 (),)>`, for some specific lifetime `'2`

error: aborting due to 3 previous errors

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