{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"if"}]}
            if constraint.gen_args.parenthesized == hir::GenericArgsParentheses::ReturnTypeNotation
            //    `for<'a> for<'r> <T as Trait<'a>>::x::<'r, T>::{opaque#0}: for<'b> Other<'b>`.
            {