I am working through A Minimal Rust Kernel | Writing an OS in Rust
I would like a situation where:
by default, I use rust-stable
for the crate rust_os, I use rust-nightly
Question: is there a way to modify rust_os/Cargo.toml so that for this one particular crate, it gets compiled with rust nightly?
There isn't a specified ABI to support calling between Rust versions, so everything needs to use the same compiler. Just don't use any #![feature(...)] in the stable-only crates.
Do you want to have rust-stable everywhere but for some project(s) rust-nightly?
If this is the case, you can use rustup override feature.
Go do project when you want to have nightly version and type:
rustup override set nightly
https://rust-lang.github.io/rustup/overrides.html#directory-overrides
Can I ask why you are deleting the comment? rustup override looks like the right solution to this problem
Well, to be honest, I thought that I misunderstood you question after posting it. What is more, I noticed that this solution is already written in a link you provided 
If this solution works for you, then my comment is reverted.
This is my fault for skipping from code block to code block, jumping over the intermediate paragraphs. 
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