syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"s.push_str(&format!("}]}
source_snippet:                 s.push_str(&format!(
context_before:             let mut debug_expn_data = |(id, expn_data): (&ExpnId, &ExpnData)| {
context_after:                     "\n{:?}: parent: {:?}, call_site_ctxt: {:?}, def_site_ctxt: {:?}, kind: {:?}",