syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> RelateResult<I, ty::TraitPredicate<I>> {
context_before:         b: ty::TraitPredicate<I>,
context_after:         let trait_ref = relation.relate(a.trait_ref, b.trait_ref)?;