title: Cannot find package math/bits
body: <p>I'm getting the following error when I execute my tests. This was working previously. Not sure what I need to do in order to fix this error.</p>
  
  <pre><code>golang.org/x/crypto/ripemd160/ripemd160block.go:12:2: cannot find package "math/bits" in any of:
      /usr/local/Cellar/go@1.8/1.8.7/libexec/src/math/bits (from $GOROOT)
  </code></pre>