error[E0178]: expected a path on the left-hand side of `+`, not `&Copy`
  --> $DIR/trait-object-reference-without-parens-suggestion.rs:4:12
   |
LL |     let _: &Copy + 'static;
   |            ^^^^^^^^^^^^^^^
   |
help: try adding parentheses
   |
LL |     let _: &(Copy + 'static);
   |             +              +

error[E0178]: expected a path on the left-hand side of `+`, not `&'static Copy`
  --> $DIR/trait-object-reference-without-parens-suggestion.rs:6:12
   |
LL |     let _: &'static Copy + 'static;
   |            ^^^^^^^^^^^^^^^^^^^^^^^
   |
help: try adding parentheses
   |
LL |     let _: &'static (Copy + 'static);
   |                     +              +

error[E0038]: the trait `Copy` is not dyn compatible
  --> $DIR/trait-object-reference-without-parens-suggestion.rs:4:12
   |
LL |     let _: &Copy + 'static;
   |            ^^^^^ `Copy` is not dyn compatible
   |
   = note: the trait is not dyn compatible because it requires `Self: Sized`
   = note: for a trait to be dyn compatible it needs to allow building a vtable
           for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0038, E0178.
For more information about an error, try `rustc --explain E0038`.