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import { expect } from "https://deno.land/x/expect/mod.ts";import Err, { PAYLOAD } from "https://deno.land/x/err/mod.ts";
(function test_err_with_payload() {  const [$foo, $bar] = ["foo", Symbol("bar")];  const $payload = { $foo, $bar };  const $err_msg = ["test_error_message"].join(":");  const err = new Err($err_msg);  const err_with_payload = err.with($payload);  Deno.test("returns self", () => {    expect(err_with_payload).toBe(err);  });  Deno.test("has expected payload", () => {    // @ts-ignore    expect(err_with_payload).toHaveProperty(PAYLOAD);    expect(err_with_payload.payload).toBe($payload);  });})();