use-modules
  guix build utils

define %directory "/tmp/meow"
mkdir-p %directory
define %files
  map
    lambda : i
      let
        : f : file %directory / : number->string i
        call-with-output-file f
          lambda : port
            display "meow\n" port
        . f
    iota 7769

process meow
  name "meow"
  inputs %files
  outputs "meow.cat"
  # {
    cat {{inputs}} > {{outputs}}
  }

workflow cat
  processes meow