While it's nice that they want to converge on rustup, I greatly prefer using my distro-provided compiler in almost all cases. Right now that is rustc 1.14, which means that that alacritty is currently beyond my compilation capability.

I don't think this is nearly as bad as the grandparent suggested though. The language is young, I'd prefer experimental features remain in the experimental branch rather than get bad design stuck in the language.

I think if you're doing dev, it's completely reasonable to expect the dev to install a newer toolchain. Cargo makes all of the actually painful parts of contributing to a project pretty trivial.