syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"HygieneData::with(|data|"}]}
source_snippet:         HygieneData::with(|data| {
context_before:         let expn_hash = update_disambiguator(&mut expn_data, ctx);
context_after:             let expn_id = data.local_expn_data.push(Some(expn_data));