syntax_data: {"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let a_ty = self.infcx.shallow_resolve(predicate.self_ty());
context_before:         let predicate = obligation.predicate.no_bound_vars().unwrap();
context_after:         let b_ty = self.infcx.shallow_resolve(predicate.trait_ref.args.type_at(1));