Emailing a bug report as directed in the terminal output:
guest@gnu ~$ guix pull Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'... Authenticating channel 'guix', commits 9edb3f6 to 943d4b7 (17,238 new commits)... Building from this channel: guix https://git.savannah.gnu.org/git/guix.git 943d4b7 substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0% building /gnu/store/sflmgcfcdwizj7iyd3pfksdvrkc3pskb-config.scm.drv... building /gnu/store/7k17dvmcrdicjsdxmpvhss4p3i3d70j5-git.scm.drv... building /gnu/store/j9s3n7iqvh8pqkxkwy91nq3qynr1nby7-hash.scm.drv... building /gnu/store/a5l8a1pypzi7wxj7vpakpm9658piay4y-module-import.drv... building /gnu/store/q26gk38hpnkpdyvxjjybq2hnyxzhk8y2-module-import.drv... building /gnu/store/mv01zhjs1dvxmsdmsw69d8y473nhrnsx-module-import-compiled.drv... building /gnu/store/hr91y089gmk18wwjslhblq3yl9mhv48w-module-import-compiled.drv... building /gnu/store/dg7gfaahxg65mz7hakkk356xm4kdshdc-compute-guix-derivation.drv... Computing Guix derivation for 'x86_64-linux'... \guix pull: error: You found a bug: the program '/gnu/store/jmxd76lck2yb88k3lzhgb4fblmsivcap-compute-guix-derivation' failed to compute the derivation for Guix (version: "943d4b775b9b1cc645e86206b0cf07da8d0030b3"; system: "x86_64-linux"; host version: "1.3.0-1.771b866"; pull-version: 1). Please report the COMPLETE output above by email to <bug-guix@gnu.org>