Add gist7390843 package.
Add gist7390843 package.

git-subtree-dir: gists/gist7390843
git-subtree-mainline: 70c469f667f38e7e188c689f237bf3bdae6daf34
git-subtree-split: bd578c06d18a2ae24f858729c5a292bceb02c367

shurcooL/go