Allow developer to specify a channel instead of a specific rust version about heroku-buildpack-rust HOT 2 CLOSED

This is an interesting idea.

Personally, my bias is to always deploy applications with a specific, known language version, and to record that version as part of the project. The idea is that I might want to come back to a deployed project 9 months later and make a small fix, without updating to the latest versions of everything.

On the other hand, Rust seems to take stability pretty seriously, so maybe it would be feasible to use something like "Rust >= 1.0.0 and < 2.0.0".

I'll implement this if lots of people want it, or if somebody makes a really convincing argument for it. But my personal bias is towards specifying an exact, known-good version when deploying.

from heroku-buildpack-rust.

This should now be implemented via Rustup, thanks to #8 and recent changes to master.

from heroku-buildpack-rust.