rust/src/test/compile-fail/regions-creating-enums3.rs

enum ast {
    num(uint),
    add(&ast, &ast)
}

fn mk_add_bad1(x: &a/ast, y: &b/ast) -> ast/&a {
    add(x, y) //~ ERROR mismatched types: expected `&a/ast/&a` but found `&b/ast/&b`
}

fn main() {
}