syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:         {
context_before:             && let ty::ImplPolarity::Reservation = tcx.impl_polarity(def_id)
context_after:             if let Some(intercrate_ambiguity_clauses) = &mut self.intercrate_ambiguity_causes {