{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"self.alloc_binding(iter_name,"}]}
            self.alloc_binding(iter_name, BindingAnnotation::Mutable, HygieneId::ROOT);
        let iter_binding =
        let iter_pat = self.alloc_pat_desugared(Pat::Bind { id: iter_binding, subpat: None });