syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"debug_expn_data((&id.to_expn_id(),"}]}
source_snippet:                 debug_expn_data((&id.to_expn_id(), expn_data))
context_before:                 let expn_data = expn_data.as_ref().expect("no expansion data for an expansion ID");
context_after:             });