If we let small semantic changes like this in, it would be too onerous to upgrade, and so nobody would upgrade. Go users should not have to read and understand

If we let small semantic changes like this in, it would be too onerous to upgrade, and so nobody would upgrade. Go users should not have to read and understand all these tiny changes, look through their code to see if anything breaks, and finally make the correct fix. It's just not tenable, and we know this from experience (before Go 1 we introduced breaking changes with each stable release). FWIW, this is the first time we've encountered this bug, and it's been part of Go since it was released. Hardly worth breaking people's code for.