Backtrace:
          11 (primitive-load "/gnu/store/56bpv7449q72lgikiks7l04snhx?")
In ice-9/ports.scm:
   433:17 10 (call-with-output-file _ _ #:binary _ #:encoding _)
In guix/pki.scm:
    94:14  9 (write-acl (acl (entry (use-modules (ice-9 #) # ?) ?) ?) ?)
In gcrypt/pk-crypto.scm:
    377:5  8 (sexp->canonical-sexp _)
In ice-9/ports.scm:
    552:4  7 (call-with-output-string _)
In gcrypt/pk-crypto.scm:
   382:17  6 (write _)
In ice-9/boot-9.scm:
   260:13  5 (for-each #<procedure write (item)> _)
In gcrypt/pk-crypto.scm:
   382:17  4 (write _)
In ice-9/boot-9.scm:
   260:13  3 (for-each #<procedure write (item)> _)
In gcrypt/pk-crypto.scm:
   382:17  2 (write _)
In ice-9/boot-9.scm:
   260:13  1 (for-each #<procedure write (item)> _)
In gcrypt/pk-crypto.scm:
   393:16  0 (write #f)

gcrypt/pk-crypto.scm:393:16: In procedure write:
unsupported sexp item type #f