kisielk/errcheck — pull request #48 by foubarre (2014-10-01 19:01:52+00:00)
Title: Optionally detect unchecked type assertions

Not sure this is the best way to go about it but I needed to detect unchecked type assertions and piggybacking on your great errcheck tool was the easiest way as I already use it anyway.
I added a -types option to detect unchecked type assertions, and it takes into account -blank as well.
Let me know what you think.