[3836293648]

They don't have to extend the language to create fragmentation. Being far enough behind rustc is enough

[cesarb]

> Being far enough behind rustc is enough

But rustc itself can be far enough behind rustc, as the MSRV debate shows.

[masklinn]

You can already do that. Some libraries wilfully restrict their MSRV for backwards compatibility or distro compatibility (e.g. Debian stable provides 1.48).

[JoshTriplett]

No argument there, but I think the third point helps address that somewhat.