error[E0178]: expected a path on the left-hand side of `+`, not `((Copy))`
  --> $DIR/trait-object-bad-parens.rs:14:16
   |
LL |     let _: Box<((Copy)) + Copy>;
   |                ^^^^^^^^^^^^^^^ expected a path

error[E0178]: expected a path on the left-hand side of `+`, not `(Copy + Copy)`
  --> $DIR/trait-object-bad-parens.rs:16:16
   |
LL |     let _: Box<(Copy + Copy) + Copy>;
   |                ^^^^^^^^^^^^^^^^^^^^ expected a path

error[E0178]: expected a path on the left-hand side of `+`, not `(Copy)`
  --> $DIR/trait-object-bad-parens.rs:18:16
   |
LL |     let _: Box<(Copy +) + Copy>;
   |                ^^^^^^^^^^^^^^^ expected a path

error[E0178]: expected a path on the left-hand side of `+`, not `(dyn Copy)`
  --> $DIR/trait-object-bad-parens.rs:20:16
   |
LL |     let _: Box<(dyn Copy) + Copy>;
   |                ^^^^^^^^^^^^^^^^^ expected a path

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0178`.