syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(data) = pred.as_trait_clause() {
context_before:         while let Some(pred) = self.base_iterator.next() {
context_after:                 return Some(data.map_bound(|t| t.trait_ref));