Switch from [compiletest_rs](https://docs.rs/compiletest_rs/latest/compiletest_rs/) to the more modern [ui_test](https://docs.rs/ui_test/latest/ui_test/). Haven't looked at what it improves on, but seems to have parallel test runs.
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Firestar99 commentedon Jul 17, 2025
ui_test also has differential test support, though it's not really documented:
https://github.com/oli-obk/ui_test/blob/main/examples/rustc_twice_with_different_flags.rs