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error[E0369]: binary operation `==` cannot be applied to type `for<'a> fn(&'a i32) -> &'a i32 {foo}`
  --> $DIR/issue-77910-1.rs:8:5
   |
LL |     assert_eq!(foo, y);
   |     ^^^^^^^^^^^^^^^^^^
   |     |
   |     for<'a> fn(&'a i32) -> &'a i32 {foo}
   |     _
   |
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: `for<'a> fn(&'a i32) -> &'a i32 {foo}` doesn't implement `Debug`
  --> $DIR/issue-77910-1.rs:8:5
   |
LL | fn foo(s: &i32) -> &i32 {
   |    --- consider calling this function
...
LL |     assert_eq!(foo, y);
   |     ^^^^^^^^^^^^^^^^^^ `for<'a> fn(&'a i32) -> &'a i32 {foo}` cannot be formatted using `{:?}` because it doesn't implement `Debug`
   |
   = help: the trait `Debug` is not implemented for fn item `for<'a> fn(&'a i32) -> &'a i32 {foo}`
   = help: use parentheses to call this function: `foo(/* &i32 */)`
   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0369.
For more information about an error, try `rustc --explain E0277`.