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The link to the immutable, ordered map that "Java provides" seems to be a link to a third-party library created by Google.

If that's enough for you to consider that a language provides a feature, just wrap the immutable ordered map implementation in your blog post in a library, publish it, and now Go provides that functionality too.

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Is it possible to write a reusable version of something like this in Go without using interface{}?

If "static codegen" is considered OK, then I guess yes, and I guess you can use The Thing[0] to even make them look like actual generics.

Every user of the library will need to run codegen to post-process their source files and generate the relevant instantiations of the "generic" collection.

[0] https://www.reddit.com/r/rust/comments/5penft/parallelizing_...

Then I could take almost any reasonable language, and transpile it to Go source. This worked for years for Javascript 5, and for C before that, and for Fortran even before that.

In either case, the reason was that the target language was considered not expressive enough, though ubiquitous.

So you can do it in Go in the same sense that you can do it in assembly language.

Exactly.

It is, of course, possible to write reusable containers without interface{}[1], but it is not exactly a replacement for proper generics.

[1] https://play.golang.org/p/2GZRkMJ_Mf

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