[plt-scheme] On PLaneT packages and compatible upgrades

On May  9, Felix Klock's PLT scheme proxy wrote:
> [...]
> Or maybe this example would provide a motivation for PLT to add such
> a form to the set of require specifications.

It's already there -- `only'.  (Been there for a year now.)

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                  http://www.barzilay.org/                 Maze is Life!