Confusing diagnostic for stray lifetime in type

[Dylan-DPC]

Code

struct Bar;
pub struct Foo<'a>('a, Bar);

Current output

error: lifetime in trait object type must be followed by `+`
 --> src/lib.rs:2:20
  |
2 | pub struct Foo<'a>('a, Bar);
  |                    ^^

error[E0224]: at least one trait is required for an object type
 --> src/lib.rs:2:20
  |
2 | pub struct Foo<'a>('a, Bar);
  |                    ^^

Rationale and extra context

Playground link

Rust Version

Tested on playground so latest stable and nightly at the time of writing (1.82.0 stable)