bug#58900: guix pull failure

[yaroe]

Updating channel 'guix' from Git repository at 
'https://git.savannah.gnu.org/git/guix.git'...
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git   9eabe0e
Computing Guix derivation for 'x86_64-linux'... |Backtrace:
          13 (primitive-load 
"/gnu/store/58czcidmlsasny3w40niawi4yi3gq9qy-compute-guix-derivation")
In ice-9/eval.scm:
    155:9 12 (_ _)
    159:9 11 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#<directory (guile-u?> ?) ?) ?) 
?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?) ?))
In ice-9/boot-9.scm:
    152:2 10 (with-fluid* _ _ _)
    152:2  9 (with-fluid* _ _ _)
In ./guix/store.scm:
  2170:24  8 (run-with-store #<store-connection 256.99 7fb3cfc11360> _ 
#:guile-for-build _ #:system _ #:target _)
   1998:8  7 (_ _)
In ./guix/gexp.scm:
   299:22  6 (_ _)
   1180:2  5 (_ _)
   1046:2  4 (_ _)
    892:4  3 (_ _)
In ./guix/store.scm:
  2055:12  2 (_ #<store-connection 256.99 7fb3d36a3960>)
   1403:5  1 (map/accumulate-builds #<store-connection 256.99 7fb3d36a3960> 
#<procedure 7fb3c79cd8a0 at ./guix/stor?> ?)
  1419:15  0 (_ #<store-connection 256.99 7fb3d36a3960> _ _)

./guix/store.scm:1419:15: Throw to key `srfi-34' with args `(#<condition 
&store-protocol-error [message: "`/usr/bin/guix substitute' died unexpectedly" 
status: 1] 7fb3c5f7ab40>)'.
guix pull: error: You found a bug: the program 
'/gnu/store/58czcidmlsasny3w40niawi4yi3gq9qy-compute-guix-derivation'
failed to compute the derivation for Guix (version: 
"9eabe0e1fdaa39b562b451404e58fecda9c712fe"; system: "x86_64-linux";
host version: "1.1.0rc2"; pull-version: 1).
Please report the COMPLETE output above by email to <bug-guix@gnu.org>.