syntax_data: {"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let args = args.as_coroutine_closure();
context_before:             ty::CoroutineClosure(_, args) => {
context_after:                 let trait_ref = args.coroutine_closure_sig().map_bound(|sig| {