error[E0178]: expected a path on the left-hand side of `+`, not `((Auto))`
  --> $DIR/trait-object-bad-parens.rs:8:16
   |
LL |     let _: Box<((Auto)) + Auto>;
   |                ^^^^^^^^^^^^^^^ expected a path

error[E0178]: expected a path on the left-hand side of `+`, not `(Auto + Auto)`
  --> $DIR/trait-object-bad-parens.rs:10:16
   |
LL |     let _: Box<(Auto + Auto) + Auto>;
   |                ^^^^^^^^^^^^^^^^^^^^ expected a path

error[E0178]: expected a path on the left-hand side of `+`, not `(Auto)`
  --> $DIR/trait-object-bad-parens.rs:12:16
   |
LL |     let _: Box<(Auto +) + Auto>;
   |                ^^^^^^^^^^^^^^^ expected a path

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

error: aborting due to 4 previous errors

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