error[E0308]: mismatched types
  --> $DIR/missing-universe-cause-issue-114907.rs:33:5
   |
LL |     accept(callback);
   |     ^^^^^^^^^^^^^^^^ one type is more general than the other
   |
   = note: expected trait `for<'a> FnOnce<(&'a (),)>`
              found trait `FnOnce<(&(),)>`
note: this closure does not fulfill the lifetime requirements
  --> $DIR/missing-universe-cause-issue-114907.rs:32:20
   |
LL |     let callback = |_| {};
   |                    ^^^
note: the lifetime requirement is introduced here
  --> $DIR/missing-universe-cause-issue-114907.rs:27:14
   |
LL | fn accept<C: FnOnce(&())>(_: C) -> Handshake<HandshakeCallback<C>> {
   |              ^^^^^^^^^^^
help: consider specifying the type of the closure parameters
   |
LL |     let callback = |_: &_| {};
   |                    ~~~~~~~

error: implementation of `FnOnce` is not general enough
  --> $DIR/missing-universe-cause-issue-114907.rs:33:5
   |
LL |     accept(callback);
   |     ^^^^^^^^^^^^^^^^ 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: implementation of `FnOnce` is not general enough
  --> $DIR/missing-universe-cause-issue-114907.rs:33:5
   |
LL |     accept(callback);
   |     ^^^^^^^^^^^^^^^^ 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[E0308]: mismatched types
  --> $DIR/missing-universe-cause-issue-114907.rs:33:5
   |
LL |     accept(callback);
   |     ^^^^^^^^^^^^^^^^ one type is more general than the other
   |
   = note: expected trait `for<'a> FnOnce<(&'a (),)>`
              found trait `FnOnce<(&(),)>`
note: this closure does not fulfill the lifetime requirements
  --> $DIR/missing-universe-cause-issue-114907.rs:32:20
   |
LL |     let callback = |_| {};
   |                    ^^^
note: the lifetime requirement is introduced here
  --> $DIR/missing-universe-cause-issue-114907.rs:20:21
   |
LL | struct Handshake<R: Role> {
   |                     ^^^^
help: consider specifying the type of the closure parameters
   |
LL |     let callback = |_: &_| {};
   |                    ~~~~~~~

error: higher-ranked subtype error
  --> $DIR/missing-universe-cause-issue-114907.rs:33:21
   |
LL |     accept(callback);
   |                     ^

error: higher-ranked subtype error
  --> $DIR/missing-universe-cause-issue-114907.rs:33:21
   |
LL |     accept(callback);
   |                     ^

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0308`.