{"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"for"}]}
        for &(key, ty) in opaque_types {
    fn register_new_opaque_types(&mut self, opaque_types: &[(ty::OpaqueTypeKey<I>, I::Ty)]) {
            let prev = self.delegate.register_hidden_type_in_storage(key, ty, self.origin_span);