Scala could be one example? When I upgraded to a newer version of the standard library (the Scala 2.13 or Scala 3 collections library), there was a tool, Scalafix [1], that could update my source code to work with the new library. Don't think it was perfect (don't remember), but helpful.

[1] https://scalacenter.github.io/scalafix/

Personally I've heard Odin [1] to do a decent job with this, at least from what I've superficially learned about its stdlib and included modules as an "outsider" (not a regular user). It appears to have things like support for e.g. image file formats built-in, and new things are somewhat liberally getting added to core if they prove practically useful, since there isn't a package manager in the traditional sense. Here's a blog post by the language author literally named "Package Managers are Evil" [2]

(Please do correct me if this is wrong, again, I don't have the experience myself.)

[1] https://pkg.odin-lang.org/

[2] https://www.gingerbill.org/article/2025/09/08/package-manage...