syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"tcx.get_attr(def_id,"}]}
source_snippet:                     tcx.get_attr(def_id, sym::rustc_reservation_impl).and_then(|a| a.value_str());
context_before:                 let message =
context_after:                 if let Some(message) = message {