bug#42519: Failure to travel back in time from July 2020 to Dec. 2018

["Ludovic Courtès" <ludovic.courtes@inria.fr>]

Hello,

I stumbled upon this error:

--8<---------------cut here---------------start------------->8---
$ guix time-machine --commit=897f303d2fa61497a931cf5fcb43349eb5f44c14 -- guix build -S icu4c@62.1
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
La jenaj derivoj estos konstruataj:
   /gnu/store/znxvzayw1nfb8z8zky65yz6bgwllyfkp-compute-guix-derivation.drv
   /gnu/store/bbh2vbm4f9n8dqc75dkkd4ja4zr5sw8s-module-import.drv
   /gnu/store/9xpasxjf8skkwrn5d98cywnjxb3g68xd-config.scm.drv
   /gnu/store/m492my56x76vl8xrpkski8ax6x5rbppj-hash.scm.drv
   /gnu/store/f661ns6g7xbv293yprics4gxnjgxhh5n-module-import-compiled.drv
building /gnu/store/9xpasxjf8skkwrn5d98cywnjxb3g68xd-config.scm.drv...
building /gnu/store/m492my56x76vl8xrpkski8ax6x5rbppj-hash.scm.drv...
building /gnu/store/bbh2vbm4f9n8dqc75dkkd4ja4zr5sw8s-module-import.drv...
building /gnu/store/f661ns6g7xbv293yprics4gxnjgxhh5n-module-import-compiled.drv...
building /gnu/store/znxvzayw1nfb8z8zky65yz6bgwllyfkp-compute-guix-derivation.drv...
;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/store.go failed:
;;; In procedure load-thunk-from-memory: incompatible bytecode kind
;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/utils.go failed:
;;; In procedure load-thunk-from-memory: incompatible bytecode kind
;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/config.go failed:
;;; In procedure load-thunk-from-memory: incompatible bytecode kind
;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/memoization.go failed:
;;; In procedure load-thunk-from-memory: incompatible bytecode kind
;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/profiling.go failed:

[…]

;;; WARNING: loading compiled file /gnu/store/rmsvza0gc8hayx61m54zpbb7rcbrf4zq-module-import-compiled/guix/build/compile.go failed:
;;; In procedure load-thunk-from-memory: incompatible bytecode kind
Backtrace:
In ice-9/boot-9.scm:
   222:29 19 (map1 _)
   222:29 18 (map1 _)
   222:29 17 (map1 (((guix packages)) ((guix sets)) ((guix #)) (…) …))
   222:29 16 (map1 (((guix sets)) ((guix modules)) ((guix # #) # …) …))
   222:29 15 (map1 (((guix modules)) ((guix build utils) # (#)) (…) …))
   222:29 14 (map1 (((guix build utils) #:select (find-files)) (…) …))
   222:17 13 (map1 (((guix build compile) #:select (#)) ((srfi #)) …))
  3297:17 12 (resolve-interface (guix build compile) #:select _ # _ # …)
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 #<procedure 7f5972fba0f0 at ice-…>)
  3527:26  6 (_)
In unknown file:
           5 (primitive-load-path "guix/build/compile" #<procedure 7…>)
In ice-9/eval.scm:
   626:19  4 (_ #<directory (guix build compile) 7f5971e90780>)
    159:9  3 (_ #<directory (guix build compile) 7f5971e90780>)
   182:19  2 (proc #<directory (guix build compile) 7f5971e90780>)
   142:16  1 (compile-top-call #<directory (guix build compile) 7f5…> …)
In unknown file:
           0 (%resolve-variable (7 . #) #<directory (guix build comp…>)

ERROR: In procedure %resolve-variable:
Unbound variable: tree-il-default-optimization-options
guix time-machine: error: You found a bug: the program '/gnu/store/cxf0z06wqbj43cmxishycj0k6s0694d9-compute-guix-derivation'
failed to compute the derivation for Guix (version: "897f303d2fa61497a931cf5fcb43349eb5f44c14"; system: "x86_64-linux";
host version: "cd0c4268d74e58fcfe9c729183d90665f4abbb09"; pull-version: 1).
Please report it by email to <bug-guix@gnu.org>.

$ guix describe
Generacio 151   Jul 20 2020 11:16:29    (nuna)
  guix cd0c426
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: cd0c4268d74e58fcfe9c729183d90665f4abbb09
--8<---------------cut here---------------end--------------->8---

In that 2018 commit, (guix build compile) looks like this:

--8<---------------cut here---------------start------------->8---
(define-module (guix build compile)
  #:use-module (ice-9 match)
  #:use-module (ice-9 format)
  #:use-module (ice-9 threads)
  #:use-module (system base target)
  #:use-module (system base compile)
  #:use-module (system base message)
  #:use-module (guix modules)
  #:use-module (guix build utils)
  #:export (%default-optimizations
            %lightweight-optimizations
            compile-files))

;; [...]

(define %default-optimizations
  ;; Default optimization options (equivalent to -O2 on Guile 2.2).
  (cond-expand
    (guile-2.2 (append (tree-il-default-optimization-options)
                       (cps-default-optimization-options)))
    (else '())))
--8<---------------cut here---------------end--------------->8---

Ludo’.