scheme@(guile-user)> (process-package-actions #:install '((151687520 "out")) #:upgrade '() #:remove '() #:use-substitutes? #t #:dry-run? #t)
The process begins ...
The following package would be installed:
   a2ps-4.14	out	/gnu/store/1akh02xh4z7i2idfnxbd28zzm87ghav1-a2ps-4.14

substitute-binary: ;;; note: source file /usr/share/guile/site/2.0/guix/config.scm
substitute-binary: ;;;       newer than compiled /usr/share/guile/site/2.0/guix/config.go
The following derivation would be built:
   /gnu/store/868vmg9s02jf4pxm3nvfmk168qbx44ld-profile.drv
The following files would be downloaded:
   /gnu/store/1akh02xh4z7i2idfnxbd28zzm87ghav1-a2ps-4.14
   /gnu/store/43bg01fshdm6hnacb9b8mha681cll0nw-coreutils-8.22
   /gnu/store/sv8ijfgc0d4ll8wzlxa6s2rkcvcjgrwx-perl-5.16.1
scheme@(guile-user)>