substitute: Backtrace:
substitute: In ice-9/boot-9.scm:
substitute:   1784:12  8 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
substitute: In unknown file:
substitute:            7 (apply-smob/0 #<thunk 7f6a344b92e0>)
substitute: In ice-9/boot-9.scm:
substitute:     733:2  6 (call-with-prompt _ _ #<procedure default-prompt-handler (k proc)>)
substitute: In ice-9/eval.scm:
substitute:     619:8  5 (_ #(#(#<directory (guile-user) 7f6a344bdc80>)))
substitute: In guix/ui.scm:
substitute:    2399:7  4 (run-guix . _)
substitute:   2362:10  3 (run-guix-command _ . _)
substitute: In guix/scripts/substitute.scm:
substitute:    732:20  2 (guix-substitute "--query")
substitute: In ice-9/ports.scm:
substitute:    439:17  1 (call-with-input-file _ _ #:binary _ #:encoding _ #:guess-encoding _)
substitute: In gcrypt/pk-crypto.scm:
substitute:    114:12  0 (_ _)
substitute: 
substitute: gcrypt/pk-crypto.scm:114:12: In procedure string->canonical-sexp: gcrypt: Invalid length specifier in S-expression
guix pull: error: `/nix/store/wbfh3afk92s6sx08hc8gfbjgpd658j9k-guix-1.5.0/bin/guix substitute' died unexpectedly