The transformation (by cps) introduces a lot of small constant vectors for accessing variables in the gunk processor global environment. The compiler shares (coalesces) these constants and by default issues warnings like this:
;Warning: Coalescing two copies of constant object #(collisions #f #f)
To turn these warnings off:
(set! compiler:coalescing-constant-warnings? #F)
Another kind of compilation warning happens when the compiler discovers that the hairy CPS-transformed code is a little simpler than it first thought.
;Warning: non-trivial procedure becoming trivial #[liar:procedure 25 let-38]
There is no way to turn these warnings off.