syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"args.as_coroutine_closure().coroutine_closure_sig().map_bound(|sig|"}]}
source_snippet:                 args.as_coroutine_closure().coroutine_closure_sig().map_bound(|sig| {
context_before:             ty::CoroutineClosure(_, args) => {
context_after:                     ty::TraitRef::new(