syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"coroutine_def_id.to_def_id(),"}]}
source_snippet:             coroutine_def_id.to_def_id(),
context_before:             parent_closure_args.parent_args(),
context_after:             ty::ClosureKind::FnOnce,