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For reference, during the initial development of incremental compilation we had the cargo-incremental tool that did something similar. The main problem I remember was that we tested large parts of a given crate's commit history and many commits were written against much older versions of Rust. But if you only test a few versions back that shouldn't be so much of a problem.
We were discussing on Zulip about some simple ideas on how to test incr compilation better.
Maybe it could be nice to build crate versions N - 1 and then incrementally build crate versions N to better exercise incr comp code.
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