syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"parent_capture.is_by_ref()"}]}
source_snippet:                     parent_capture.is_by_ref() || coroutine_kind != ty::ClosureKind::FnOnce,
context_before:                 assert!(
context_after:                     "`FnOnce` coroutine-closures return coroutines that capture from \