syntax_data: {"ast_node_type":"variable","tokens":[{"end":37,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let kw = Symbol::new(kw);
context_before:         .filter_map(|kw| {
context_after:             if kw.is_used_keyword_always() || kw.is_used_keyword_conditional(edition) {