D is publicly used by Facebook, but I don't think for production -- it's used for their style-checker https://code.facebook.com/posts/729709347050548/under-the

D is publicly used by Facebook, but I don't think for production -- it's used for their style-checker https://code.facebook.com/posts/729709347050548/under-the-hood-building-and-open-sourcing-flint/ https://code.facebook.com/posts/729709347050548/under-the-ho...