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error: lifetime may not live long enough
  --> $DIR/regions-creating-enums4.rs:7:5
   |
LL | fn mk_add_bad2<'a,'b>(x: &'a Ast<'a>, y: &'a Ast<'a>, z: &Ast) -> Ast<'b> {
   |                -- -- lifetime `'b` defined here
   |                |
   |                lifetime `'a` defined here
LL |     Ast::Add(x, y)
   |     ^^^^^^^^^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
   |
   = help: consider adding the following bound: `'a: 'b`

error: aborting due to previous error