syntax_data: {"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let items = attr.meta_item_list();
context_before:     for attr in tcx.get_attrs(def_id, sym::rustc_mir) {
context_after:         for item in items.iter().flat_map(|l| l.iter()) {