rust/src/test/ui/regions/regions-creating-enums3.rs

// revisions: base nll
// ignore-compare-mode-nll
//[nll] compile-flags: -Z borrowck=mir

enum Ast<'a> {
    Num(usize),
    Add(&'a Ast<'a>, &'a Ast<'a>)
}

fn mk_add_bad1<'a,'b>(x: &'a Ast<'a>, y: &'b Ast<'b>) -> Ast<'a> {
    Ast::Add(x, y)
    //[base]~^ ERROR lifetime mismatch [E0623]
    //[nll]~^^ ERROR lifetime may not live long enough
}

fn main() {
}