That used to be true a couple years ago, but I don't think I've used a nightly compiler version at any point in the last 12 months.
That said, I think for this first phase the kernel is planning on a specific stable version of the compiler with nightly features enabled, because they have a couple specific needs that haven't made it through the stabilization process yet.
That said, I think for this first phase the kernel is planning on a specific stable version of the compiler with nightly features enabled, because they have a couple specific needs that haven't made it through the stabilization process yet.