-1 to Automatic semicolon insertion (seriously).
I probably would have kept at it a bit longer if the dev team was more accepting of feedback presented in good faith. I'm not really surprised -- it's often hard to tell the difference between fruitless bikeshedding and oh guys FYI you might consider this a problem, I do.
I am biased towards semis though, when I first saw OCaml's ';;' I was pleased.
That said, I remember seeing something about a way that semi-colon insertion leads to the possibility of a misleading "if", but I can't find it anymore.
All the bitching about ';' comes from people that clearly have not used Go or tried to parse it.