syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"data.local_expn_data.iter_enumerated().for_each(|(id,"}]}
source_snippet:             data.local_expn_data.iter_enumerated().for_each(|(id, expn_data)| {
context_before:             };
context_after:                 let expn_data = expn_data.as_ref().expect("no expansion data for an expansion ID");