syntax_data: {"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let name = tcx.item_name(def_id);
context_before:             LateParamRegionKind::Named(def_id) => {
context_after:                 if name != kw::UnderscoreLifetime { Some(name) } else { None }