It isn't a language freeze but a comparability promise. "It is intended that programs written to the Go 1 specification will continue to compile and run correc

It isn't a language freeze but a comparability promise. "It is intended that programs written to the Go 1 specification will continue to compile and run correctly, unchanged, over the lifetime of that specification. At some indefinite point, a Go 2 specification may arise, but until that time, Go programs that work today should continue to work even as future "point" releases of Go 1 arise (Go 1.1, Go 1.2, etc.)." Granted that means it is effectively a freeze on backwards incompatible changes, but it does leave the door open for additions to the language. Having said that, the go authors are definitely very conservative with language changes.