Re:A Grand Vision for Rust
by aw1621107 on Sunday March 08, 2026 @04:28PM
(#47301069)
What you're describing sounds more like a potential issue with editions if/when they allow breaking stdlib changes more than a problem with editions as they exist today, which is more what I took the original comment to be talking about.
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Exactly because they don't allow it, they don't cover all scenarios regarding language evolution
OK, sure, but again what breaking changes editions do/don't currently allow is independent from what SkiFire13/I was responding to, which was the "requires full access to source code" bit.
How do you expect a compiler to be able to mix and match changes across editions between crates, if those happen to be changes in semantic behaviour?
Depends on the change. Obviously the compiler doesn't need to care about cross-edition compatibility between crates if the changes in question don't impact the public API. Otherwise, I'd expect the compiler to canonicalize the changes, and from what I understand that is precisely how edition changes are chosen/designed/implemented.