$ guix time-machine 8e7e414aa998fe8c0de8a491c91aab8b8d9c58f4 -- graph maven Updating channel 'guix' from Git repository at ' https://git.savannah.gnu.org/git/guix.git'... Computing Guix derivation for 'x86_64-linux'... Backtrace: In ice-9/boot-9.scm: 3393:24 19 (_) 222:29 18 (map1 _) 222:29 17 (map1 _) 222:29 16 (map1 _) 222:29 15 (map1 _) 222:29 14 (map1 _) 222:17 13 (map1 (((gnu packages crates-io)) ((gnu packages crates-graphics)) ((gnu packages documentation)) (#) ?)) 3297:17 12 (resolve-interface (gnu packages crates-io) #:select _ #:hide _ #:prefix _ #:renamer _ #:version _) In ice-9/threads.scm: 390:8 11 (_ _) In ice-9/boot-9.scm: 3223:13 10 (_) In ice-9/threads.scm: 390:8 9 (_ _) In ice-9/boot-9.scm: 3507:20 8 (_) 2806:4 7 (save-module-excursion _) 3527:26 6 (_) In unknown file: 5 (primitive-load-path "gnu/packages/crates-io" #) In ice-9/eval.scm: 619:8 4 (_ #f) 626:19 3 (_ #) 159:9 2 (_ #) 223:20 1 (proc #) In unknown file: 0 (%resolve-variable (7 . skim-0.7) #) ERROR: In procedure %resolve-variable: error: skim-0.7: unbound variable -guix time-machine: error: You found a bug: the program '/gnu/store/3sfsx0lzx3n9dhsdrd4vxriz0avi4j6l-compute-guix-derivation' failed to compute the derivation for Guix (version: "453f18db343cbad1892186b85c7eb07f364b399e"; system: "x86_64-linux"; host version: "838347207cdd96de1ad0127aaf4b2c378c7c2148"; pull-version: 1). Please report it by email to .