syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"_parent_trait_pred:"}]}
source_snippet:         _parent_trait_pred: crate::Binder<I, crate::TraitPredicate<I>>,
context_before:         supertrait_span: <I as Interner>::Span,
context_after:         _index: usize,