syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"found_trait_ref:"}]}
source_snippet:         found_trait_ref: ty::PolyTraitRef<'tcx>,
context_before:         obligation: TraitObligation<'tcx>,
context_after:     ) -> Result<PredicateObligations<'tcx>, SelectionError<'tcx>> {