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13.2 “What has changed between ASDF 1, ASDF 2 and ASDF 3?”

We released ASDF 2.000 on May 31st 2010, and ASDF 3.0.0 on May 15th 2013. Releases of ASDF 2 and later have since then been included in all actively maintained CL implementations that used to bundle ASDF 1, plus some implementations that previously did not. ASDF has been made to work with all actively maintained CL implementations and even a few implementations that are not actively maintained. See “What has changed between ASDF 1 and ASDF 2?”. Furthermore, it is possible to upgrade from ASDF 1 to ASDF 2 or ASDF 3 on the fly (though we recommend instead upgrading your implementation or its ASDF module). For this reason, we have stopped supporting ASDF 1 and ASDF 2. If you are using ASDF 1 or ASDF 2 and are experiencing any kind of issues or limitations, we recommend you upgrade to ASDF 3 — and we explain how to do that. See Loading ASDF. (In the context of compatibility requirements, ASDF 2.27, released on Feb 1st 2013, and further 2.x releases up to 2.33, count as pre-releases of ASDF 3, and define the :asdf3 feature; still, please use the latest release). Release ASDF 3.1.2 and later also define the :asdf3.1 feature.


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