error[E0308]: mismatched types
  --> $DIR/issue-66451.rs:19:58
   |
LL |     let y: Test<{ Foo { value: 3, nested: &Bar(5) } }> = x;
   |            -------------------------------------------   ^ expected `Foo { value: 3, nested: &Bar::<i32>(5) }`, found `Foo { value: 3, nested: &Bar::<i32>(4) }`
   |            |
   |            expected due to this
   |
   = note: expected struct `Test<Foo { value: 3, nested: &Bar::<i32>(5) }>`
              found struct `Test<Foo { value: 3, nested: &Bar::<i32>(4) }>`

error: aborting due to 1 previous error

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