syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"where_clause_trait_ref:"}]}
source_snippet:         where_clause_trait_ref: ty::PolyTraitRef<'tcx>,
context_before:         stack: &TraitObligationStack<'o, 'tcx>,
context_after:     ) -> Result<EvaluationResult, OverflowError> {