syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"|"}]}
source_snippet:             | PredicateKind::Clause(ClauseKind::UnstableFeature(_))
context_before:             | PredicateKind::Clause(ClauseKind::ConstArgHasType(..))
context_after:             | PredicateKind::NormalizesTo(..)