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+error[E0038]: the trait `Expr` cannot be made into an object
+ --> $DIR/object-safety-issue-22040.rs:12:23
+ |
+LL | elements: Vec<Box<dyn Expr + 'x>>,
+ | ^^^^^^^^^^^^^ `Expr` cannot be made into an object
+ |
+note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
+ --> $DIR/object-safety-issue-22040.rs:5:21
+ |
+LL | trait Expr: Debug + PartialEq {
+ | ---- ^^^^^^^^^ ...because it uses `Self` as a type parameter
+ | |
+ | this trait cannot be made into an object...
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0038`.