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It is Go, the language, that provides a backwards compatibility guarantee.

Another tenant of Go, the language, is specification before implementation. There specifically so that many implementations of the language are created and do not become dependant on quirks of a single set of tools and enabling users to choose which tooling they prefer.

Point being, there is a very clear line drawn between Go the language and the Go distribution. Guarantees provided by one are not necessarily applicable to another. Nor do they apply to gcc-go or tinygo.