Doesn't Rust already have that solved via editions? If anything, that's the language that's especially well positioned here.
I believe the stdlib can't be versioned like that: there's only one stdlib linked into a final artifact, you can't have two versions with differing APIs in there.
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I believe the stdlib can't be versioned like that: there's only one stdlib linked into a final artifact, you can't have two versions with differing APIs in there.