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A piece of anecdata: my Rust code from 8 years ago still compiles fine, though compiler complains about not having the defined edition set.

Ah. Apparently I didn’t use that crate, so happily missed that footgun, thanks for the info! That is an unfortunate case.

Though I suspect it’s fair to say the entire settlement is built of glass houses here :-)

I suppose if one wants absolutely no surprises, they will need to lock the entire toolchain as well, regardless of the language…

Maybe, but this GCC change would affect only code that is already broken and then there is even a compiler flag to fix it.