Kind of depends on how "go programmer" is defined, too. I've used go, but I certainly wouldn't call myself a "go programmer" at this point.
So even if you did Go full-time for 5 years, but then switched to Rust and now work full-time in Rust, you would not mind at all if the language added some backward-incompatible changes.
In fact you'd probably welcome them, since often you moved away because of features the language was missing.