{"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
            let end_span = last_bound.span();
            // `end_span` is the end of the poly trait ref (Foo + 'baz + Bar><)
            // `last_bound_span` is the last bound of the poly trait ref (Foo + >'baz< + Bar)