{"ast_node_type":"import","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
        // `dyn Bar` to `dyn Bar + 'x` (because of the `T: 'a` bound)
        // If you have `Foo<'x, dyn Bar, dyn Baz>`, we want to default
        // and `dyn Baz` to `dyn Baz + 'static` (because there is no