syntax_data: {"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if let ty::ExistentialPredicate::Trait(ref trait_ref) = predicate.skip_binder() {
context_before:             for predicate in binder.iter() {
context_after:                     let def_id = trait_ref.def_id;