1 error[E0623]: lifetime mismatch
2 --> $DIR/regions-creating-enums3.rs:7:5
4 LL | fn mk_add_bad1<'a,'b>(x: &'a Ast<'a>, y: &'b Ast<'b>) -> Ast<'a> {
7 | this parameter and the return type are declared with different lifetimes...
9 | ^^^^^^^^^^^^^^ ...but data from `y` is returned here
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0623`.