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A software bug is an error, flaw or fault in a computer program or system that causes it to produce an incorrect or unexpected result, or to behave in unintended ways.

If the Rust compiler developers intend to provide backwards compatibility, but accidentally make a change that breaks that, then that is absolutely 100% a bug. You are allowed to prefer that the software you use has minimal bugs, but you are deluding yourself if you think that the Go compiler (or essentially any other piece of software) is bug free.

If you use highly unstable, nightly only, Rust features then experiencing breakage is almost a certainty. That's why they're highly unstable, nightly only, features.

I think the Go team would also appreciate it if you filed bugs after finding a legitimate regression.