syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let message =
context_before:             if let Some(intercrate_ambiguity_clauses) = &mut self.intercrate_ambiguity_causes {
context_after:                     tcx.get_attr(def_id, sym::rustc_reservation_impl).and_then(|a| a.value_str());