One of the compilation passes in a Scheme compiler (e.g. Guile or Racket) is conversion to continuation passing style. Here the author applies the pass manually

One of the compilation passes in a Scheme compiler (e.g. Guile or Racket) is conversion to continuation passing style. Here the author applies the pass manually as a code design decision, because later passes of the compiler (i.e. the actual C compiler) produce better code given that input. It's neat.