syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"iter::zip(a,"}]}
source_snippet:             iter::zip(a, b).map(|(ep_a, ep_b)| match (ep_a.skip_binder(), ep_b.skip_binder()) {
context_before:         let v =
context_after:                 (ty::ExistentialPredicate::Trait(a), ty::ExistentialPredicate::Trait(b)) => {