{"ast_node_type":"impl","tokens":[{"end":48,"kind":"keyword","start":0,"text":"//"}]}
                // with `impl Send: OtherTrait`.
                // e.g. `type Assoc: OtherTrait`, replace `<impl Trait as Trait>::Assoc: OtherTrait`
                for (assoc_pred, assoc_pred_span) in cx