syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for (index, (predicate, span)) in predicates.into_iter().enumerate() {
context_before:         let mut obligations = PredicateObligations::with_capacity(predicates.len());
context_after:             let cause = if tcx.is_lang_item(parent_trait_pred.def_id(), LangItem::CoerceUnsized) {