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kotlinlang

if I compile my library with k2, would it be compatible with my app that is not using k2?

By default it wouldn't
At this moment binaries produced by K2 are marked as unstable, because we didn't ensure that ABI from K2 is the same as for K1 in all cases yet
But you can allow your app to consume unstable binaries with `-Xskip-prerelease-check` compiler flag (and maybe `-Xskip-metadata-version-check` is also required, I don't remember exactly)