starting phase `set-SOURCE-DATE-EPOCH'
phase `set-SOURCE-DATE-EPOCH' succeeded after 0.0 seconds
starting phase `set-paths'
error: in phase 'set-paths': uncaught exception:
wrong-type-arg "car" "Wrong type argument in position 1 (expecting pair): ~S" (quote) (quote) 
phase `set-paths' failed after 0.0 seconds
Backtrace:
           9 (primitive-load "/gnu/store/vzgh48bj5pp9fkcklk45bbhzi3j?")
In guix/build/gnu-build-system.scm:
    908:2  8 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
  1752:10  7 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
    634:9  6 (for-each #<procedure 7fffeebb96c0 at guix/build/gnu-b?> ?)
In ice-9/boot-9.scm:
  1752:10  5 (with-exception-handler _ _ #:unwind? _ # _)
In guix/build/gnu-build-system.scm:
   929:23  4 (_)
     88:4  3 (set-paths #:target _ #:inputs _ #:native-inputs _ # _ # ?)
In srfi/srfi-1.scm:
   917:20  2 (alist-delete "source" _ _)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure car: Wrong type argument in position 1 (expecting pair): quote