Backtrace:
           2 (primitive-load "/gnu/store/k2liamlgy9123riizdvbzd6sxwl…")
In ice-9/eval.scm:
    619:8  1 (_ #f)
    619:8  0 (_ #t)

ice-9/eval.scm:619:8: Wrong type to apply: "unzip"