error[E0277]: can't compare `&i32` with `Bar<'b, 'a>`
  --> $DIR/self-referential.rs:5:31
   |
LL | fn bar<'a, 'b>(i: &'a i32) -> Bar<'a, 'b> {
   |                               ^^^^^^^^^^^ no implementation for `&i32 == Bar<'b, 'a>`
LL |
LL |     i
   |     - return type was inferred to be `&i32` here
   |
   = help: the trait `PartialEq<Bar<'b, 'a>>` is not implemented for `&i32`
   = help: the following other types implement trait `PartialEq<Rhs>`:
             f32
             f64
             i128
             i16
             i32
             i64
             i8
             isize
           and 6 others

error[E0277]: can't compare `&i32` with `(i32, &i32)`
  --> $DIR/self-referential.rs:12:31
   |
LL | fn foo<'a, 'b>(i: &'a i32) -> Foo<'a, 'b> {
   |                               ^^^^^^^^^^^ no implementation for `&i32 == (i32, &i32)`
LL |
LL |     (42, i)
   |     ------- return type was inferred to be `(i32, &i32)` here
   |
   = help: the trait `PartialEq<(i32, &i32)>` is not implemented for `&i32`
   = help: the following other types implement trait `PartialEq<Rhs>`:
             f32
             f64
             i128
             i16
             i32
             i64
             i8
             isize
           and 6 others

error[E0277]: can't compare `&i32` with `(i32, Moo<'b, 'a>::{opaque#0})`
  --> $DIR/self-referential.rs:19:31
   |
LL | fn moo<'a, 'b>(i: &'a i32) -> Moo<'a, 'b> {
   |                               ^^^^^^^^^^^ no implementation for `&i32 == (i32, Moo<'b, 'a>::{opaque#0})`
LL |
LL |     (42, i)
   |     ------- return type was inferred to be `(i32, &i32)` here
   |
   = help: the trait `PartialEq<(i32, Moo<'b, 'a>::{opaque#0})>` is not implemented for `&i32`
   = help: the following other types implement trait `PartialEq<Rhs>`:
             f32
             f64
             i128
             i16
             i32
             i64
             i8
             isize
           and 6 others

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0277`.