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+error[E0369]: binary operation `==` cannot be applied to type `for<'r> fn(&'r i32) -> &'r i32 {foo}`
+ --> $DIR/issue-77910-1.rs:8:5
+ |
+LL | assert_eq!(foo, y);
+ | ^^^^^^^^^^^^^^^^^^
+ | |
+ | for<'r> fn(&'r i32) -> &'r 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<'r> fn(&'r i32) -> &'r 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<'r> fn(&'r i32) -> &'r i32 {foo}` cannot be formatted using `{:?}` because it doesn't implement `Debug`
+ |
+ = help: the trait `Debug` is not implemented for `for<'r> fn(&'r i32) -> &'r i32 {foo}`
+ = help: use parentheses to call the function: `foo(s)`
+ = 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`.