{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
            // Name will be "{closure_env#0}<T1, T2, ...>", "{coroutine_env#0}<T1, T2, ...>", or
        | ty::Coroutine(def_id, args, ..) => {
            // "{async_fn_env#0}<T1, T2, ...>", etc.