syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"trait_ref,"}]}
source_snippet:                     trait_ref,
context_before:                 })) => Some(PredicateKind::Clause(ClauseKind::Trait(TraitPredicate {
context_after:                     polarity: polarity.flip(),