1 error[E0038]: the trait `A` cannot be made into an object
2 --> $DIR/wf-object-safe.rs:9:13
4 LL | fn foo(&self, _x: &Self);
5 | --- method `foo` references the `Self` type in its parameters or return type
8 | ^^^^^^ the trait `A` cannot be made into an object
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0038`.