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Yeah, the author even had to add support for the appropriate calling convention (win64) to the compiler[1] to get it to work.

To be fair, Rust probably would have needed this for some other reason in the future. I see this more as making Rust a more complete language.

That was hardly challenging, look at the number of changes.

I didn't say it was challenging. (And yes, most of the changes are actually fixing a different bug, not just adding support for the new ABI.)