{"ast_node_type":"impl","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
                        // Nested impl traits like `impl Foo<Assoc = impl Bar>` are allowed
                    if let Some(name_ref) = assoc_type_arg.name_ref() {
                        self.with_outer_impl_trait_scope(false, |this| {