Incorrect Line Attribution in Failure Messages

The attached .tar.gz is a copy of a project I've been working on, in an intermediary form because I was working on writing some tests for a package when I encountered this bug. If you run 'go test github.com/bieber/drones/asm' on it, go check reports an error as having occurred in y.go:416, which obviously isn't part of the test suite. I'm also getting this error regardless of where in the test suite a test actually fails, even if, as in the example I'm sending, it's just an Assert(1, Equals, 0) right at the top of a test function.

y.go is auto-generated by the go yacc tool, which I suspect may have something to do with the problem.