(function(env) {
  function getAsyncCtor() {
    try {
      eval("var func = async function(){};");
    } catch (e) {
      return null;
    }

    return Object.getPrototypeOf(func).constructor;
  }

  function hasAsyncAwaitSupport() {
    return getAsyncCtor() !== null;
  }

  env.makeAsyncAwaitFunction = function() {
    var AsyncFunction = getAsyncCtor();
    return new AsyncFunction("");
  };

  env.requireAsyncAwait = function() {
    if (!hasAsyncAwaitSupport()) {
      env.pending("Environment does not support async/await functions");
    }
  };
})(jasmine.getEnv());