{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
            let span = and_span.to(self.look_ahead(1, |t| t.span));
            // We have `&dyn mut ...`, which is invalid and should be `&mut dyn ...`.
            self.dcx().emit_err(DynAfterMut { span });