what is the plan for rust?

[Greg Troxel <gdt%lexort.com@localhost>]

I know it's early October but we will be talking about Q4 soon enough!

wip is now at 1.73 while pkgsrc is at 1.70.   Earlier I thought pkgsrc
was going to be upgraded to 1.71 right after the branch, and then
again.

I do not know if we have a plan that one can regenerate bootstraps along
the way, version by version, and I don't know if 1.N still requires
1.N-1.

Do we have a plan?  What is it?  Why?