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I would love to know what the errors actually were, maybe a deeper dive into what and why compatibility was supposedly broken. Did the rust developers know that they were breaking compatibility? Firefox is a pretty big high profile user of rust, a breaking change couldn't have just snuck by.

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Firefox only cares about Firefox working with the specific rust versions they intend to support. They also use some hidden non document rust flags to use unstable rust options/features on stable (but increasingly less, the flag exists only for bootstraping rust itself and isn't meant to be used by anything else).

Which is fine for Firefox itself.

Just a problem for anyone forking of Firefox. (Or for other reasons trying to build it with a different rust version.)

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