1 error[E0038]: the trait `Expr` cannot be made into an object
2 --> $DIR/object-safety-issue-22040.rs:12:23
4 LL | trait Expr: Debug + PartialEq {
5 | ---- --------- ...because it uses `Self` as a type parameter in this
7 | this trait cannot be made into an object...
9 LL | elements: Vec<Box<dyn Expr + 'x>>,
10 | ^^^^^^^^^^^^^ the trait `Expr` cannot be made into an object
12 error: aborting due to previous error
14 For more information about this error, try `rustc --explain E0038`.