Per the example in https://godoc.org/github.com/google/go-cmp/cmp#Diff the form should be:

if diff := cmp.Diff(want, got); diff != "" {
    t.Errorf("MakeGatewayInfo() mismatch (-want +got):\n%s", diff)
}

however, NUD tests (and possibly others) are littered with the reverse, e.g.:
https://github.com/google/gvisor/blob/8fa18e8ecb3e3da2015e5c73db9e46494dcfeff7/pkg/tcpip/stack/neighbo

If I rattle on the keyboard I get ControlLeft coming up regularly, even though I am far from the control keys. Upgrading pc_keyboard to 0.5.0 seems to fix it.

Resurrecting the second bullet from #1334

• Figure out how to fix favicon / logo more generally (here's a start https://github.com/tock/tock/tree/doc-updates)