syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let next_in_dataflow_order = |it: &mut std::vec::IntoIter<_>| {
context_after:             if A::Direction::IS_FORWARD { it.next().unwrap() } else { it.next_back().unwrap() }