title: "import cycle not allowed" while running test in golang example
body: <p>I'm trying to setup tests for my functions in golang, but getting the following error while running <code>go test ...</code> from the console:</p>
  
  <blockquote>
    <p>import cycle not allowed package runtime
            imports unsafe
            imports runtime</p>
  </blockquote>
  
  <p>Thinking that it was me I cloned the <a href="https://github.com/golang/example" rel="nofollow">golang example project</a> and ran <code>go test reverse_test.go</code>, but getting the same error.
  Both my <code>GOPATH</code> and <code>GOROOT</code> environment values are set to <code>C:\go</code>, where I installed Go.
  I'm on a Windows 8.1, 64bit machine.</p>
  
  <p>Any ideas what's wrong?</p>