If they followed the license nothing. My uninformed knowledge is that the rust based rewrite is MIT, the originals are GPL, and you can't include GPL code in a MIT licensed project without making it GPL.

But you should be able to use a GPL test suite on an MIT-licensed program (or even a proprietary one, without the program needing to be under the GPL.

Ehh... Technically yes but when you don't own the copyright on the tests you need to be very careful against creating derivative works, and you need to preserve both licenses in the distributed source.

> and you can't include GPL code in a MIT licensed project without making it GPL.

Why is that? The tests are not linked to the distributed binaries. You can also distribute project sources with mixed licenses.

The current top three auto-makers by sales in Australia are Toyota, BYD, then Ford. They might not have quite the same market penetration in Europe but BYD vehicles are sold there, and some have 5 star safety ratings.

You could only allow the conversion for farms that grow corn for ethanol at first. Isn't that around 10 million hectares on the low estimates?