Build:
  1. 0
2026-03-25 13:15.03: New job: test cb-check.0.1 with ocaml-compiler.5.4.0~rc1, using opam dev
                              from https://github.com/ocaml/opam-repository.git#refs/pull/29582/head (fa5fb3a6a806e832e4c7791145889a6bbe8b64ef)
                              on debian-13-ocaml-5.4/amd64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/29582/head" && git reset --hard fa5fb3a6
git fetch origin master
git merge --no-edit 2f93e9d4614d6376ed929fc2cee7c59cb9d5833b
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-5.4@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6
USER 1000:1000
WORKDIR /home/opam
RUN sudo ln -f /usr/bin/opam-dev /usr/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn ocaml-compiler.5.4.0~rc1 5.4.0~rc1
RUN opam reinstall --update-invariant ocaml-compiler.5.4.0~rc1; \
    res=$?; \
    test "$res" != 31 && exit "$res"; \
    export OPAMCLI=2.0; \
    build_dir=$(opam var prefix)/.opam-switch/build; \
    failed=$(ls "$build_dir"); \
    partial_fails=""; \
    for pkg in $failed; do \
    if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"debian-13\""; then \
    echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field."; \
    fi; \
    test "$pkg" != 'ocaml-compiler.5.4.0~rc1' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1
RUN opam reinstall cb-check.0.1; \
    res=$?; \
    test "$res" != 31 && exit "$res"; \
    export OPAMCLI=2.0; \
    build_dir=$(opam var prefix)/.opam-switch/build; \
    failed=$(ls "$build_dir"); \
    partial_fails=""; \
    for pkg in $failed; do \
    if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"debian-13\""; then \
    echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field."; \
    fi; \
    test "$pkg" != 'cb-check.0.1' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1
RUN (opam reinstall --with-test cb-check.0.1) || true
RUN opam reinstall --with-test --verbose cb-check.0.1; \
    res=$?; \
    test "$res" != 31 && exit "$res"; \
    export OPAMCLI=2.0; \
    build_dir=$(opam var prefix)/.opam-switch/build; \
    failed=$(ls "$build_dir"); \
    partial_fails=""; \
    for pkg in $failed; do \
    if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"debian-13\""; then \
    echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field."; \
    fi; \
    test "$pkg" != 'cb-check.0.1' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1

END-OF-DOCKERFILE
docker build -f ../Dockerfile .

2026-03-25 13:15.03: Using cache hint "ocaml/opam:debian-13-ocaml-5.4@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6-ocaml-compiler.5.4.0~rc1-cb-check.0.1-fa5fb3a6a806e832e4c7791145889a6bbe8b64ef"
2026-03-25 13:15.03: Using OBuilder spec:
((from ocaml/opam:debian-13-ocaml-5.4@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6)
 (user (uid 1000) (gid 1000))
 (workdir /home/opam)
 (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
 (run (network host)
      (shell "opam init --reinit --config .opamrc-sandbox -ni"))
 (run (shell "opam option solver=builtin-0install && opam config report"))
 (env OPAMDOWNLOADJOBS 1)
 (env OPAMERRLOGLEN 0)
 (env OPAMPRECISETRACKING 1)
 (env CI true)
 (env OPAM_REPO_CI true)
 (run (shell "rm -rf opam-repository/"))
 (copy (src .) (dst opam-repository/))
 (run (shell "opam repository set-url --strict default opam-repository/"))
 (run (network host)
      (shell "opam update --depexts || true"))
 (run (shell "opam pin add -k version -yn ocaml-compiler.5.4.0~rc1 5.4.0~rc1"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell  "opam reinstall --update-invariant ocaml-compiler.5.4.0~rc1;\
             \n        res=$?;\
             \n        test \"$res\" != 31 && exit \"$res\";\
             \n        export OPAMCLI=2.0;\
             \n        build_dir=$(opam var prefix)/.opam-switch/build;\
             \n        failed=$(ls \"$build_dir\");\
             \n        partial_fails=\"\";\
             \n        for pkg in $failed; do\
             \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"debian-13\\\"\"; then\
             \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
             \n          fi;\
             \n          test \"$pkg\" != 'ocaml-compiler.5.4.0~rc1' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell  "opam reinstall cb-check.0.1;\
             \n        res=$?;\
             \n        test \"$res\" != 31 && exit \"$res\";\
             \n        export OPAMCLI=2.0;\
             \n        build_dir=$(opam var prefix)/.opam-switch/build;\
             \n        failed=$(ls \"$build_dir\");\
             \n        partial_fails=\"\";\
             \n        for pkg in $failed; do\
             \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"debian-13\\\"\"; then\
             \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
             \n          fi;\
             \n          test \"$pkg\" != 'cb-check.0.1' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
 (run (network host)
      (shell "(opam reinstall --with-test cb-check.0.1) || true"))
 (run (shell  "opam reinstall --with-test --verbose cb-check.0.1;\
             \n        res=$?;\
             \n        test \"$res\" != 31 && exit \"$res\";\
             \n        export OPAMCLI=2.0;\
             \n        build_dir=$(opam var prefix)/.opam-switch/build;\
             \n        failed=$(ls \"$build_dir\");\
             \n        partial_fails=\"\";\
             \n        for pkg in $failed; do\
             \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"debian-13\\\"\"; then\
             \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
             \n          fi;\
             \n          test \"$pkg\" != 'cb-check.0.1' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
)

2026-03-25 13:15.03: Waiting for resource in pool OCluster
2026-03-25 21:39.53: Waiting for worker…
2026-03-25 21:42.49: Got resource from pool OCluster
Building on laodoke.caelum.ci.dev
All commits already cached
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HEAD is now at 2f93e9d461 Merge pull request #29592 from dinosaure/release-miou-v0.5.5
Merge made by the 'ort' strategy.
 packages/ocaml-compiler/ocaml-compiler.5.3.0/opam      |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.3/opam        |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.4.0/opam      |  5 ++++-
 .../ocaml-compiler/ocaml-compiler.5.4.0~alpha1/opam    |  5 ++++-
 .../ocaml-compiler/ocaml-compiler.5.4.0~beta1/opam     |  5 ++++-
 .../ocaml-compiler/ocaml-compiler.5.4.0~beta2/opam     |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.4.0~rc1/opam  |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.4.1/opam      |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.4/opam        |  5 ++++-
 .../ocaml-compiler/ocaml-compiler.5.5.0~alpha1/opam    |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.5/opam        |  5 ++++-
 packages/ocaml-compiler/ocaml-compiler.5.6/opam        |  5 ++++-
 packages/ocaml-option-llvm/ocaml-option-llvm.1/opam    | 18 ++++++++++++++++++
 .../ocaml-options-vanilla/ocaml-options-vanilla.1/opam |  1 +
 packages/ocaml-variants/ocaml-variants.5.2.0+msvc/opam |  2 ++
 15 files changed, 69 insertions(+), 12 deletions(-)
 create mode 100644 packages/ocaml-option-llvm/ocaml-option-llvm.1/opam

(from ocaml/opam:debian-13-ocaml-5.4@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6)
Unable to find image 'ocaml/opam:debian-13-ocaml-5.4@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6' locally
docker.io/ocaml/opam@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6: Pulling from ocaml/opam
866771c43bf5: Already exists
1e49bea09367: Already exists
e793768537e6: Already exists
ed323d3d481a: Already exists
7df34a5cd5f1: Already exists
fd712d3eb935: Already exists
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e1ec5a753447: Already exists
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f6cbd774d654: Pulling fs layer
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020670bcefab: Waiting
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b40777a84cca: Verifying Checksum
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46df05d0db83: Verifying Checksum
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Digest: sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6
Status: Downloaded newer image for ocaml/opam@sha256:bd342cbd7766c453282fdafbc2e565ae3361320ec344722cf4372b782e4a97f6
2026-03-25 21:42.56 ---> using "41eea30e3f639c18d8cf57c309ec76919ec7b2398036f7e41744cbce59a133d3" from cache

/: (user (uid 1000) (gid 1000))

/: (workdir /home/opam)

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
2026-03-25 21:42.56 ---> using "4ad7f430d684c40cedc651267e0edf890c044fe4e624255de377c471b4526bac" from cache

/home/opam: (run (network host)
                 (shell "opam init --reinit --config .opamrc-sandbox -ni"))
Configuring from /home/opam/.opamrc-sandbox, then /home/opam/.opamrc, and finally from built-in defaults.
Checking for available remotes: rsync and local, git.
  - you won't be able to use mercurial repositories unless you install the hg command on your system.
  - you won't be able to use darcs repositories unless you install the darcs command on your system.

This version of opam requires an update to the layout of /home/opam/.opam from version 2.0 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [Y/n] y
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
2026-03-25 21:42.56 ---> using "71fa58e52457bf6a7eac317c6a6ef1e2bdf53e533a1e4fd04b90c9349347e038" from cache

/home/opam: (run (shell "opam option solver=builtin-0install && opam config report"))
Set to 'builtin-0install' the field solver in global configuration
# opam config report
# opam-version         2.5.0
# self-upgrade         no
# system               arch=x86_64 os=linux os-distribution=debian os-version=13
# solver               builtin-0install
# install-criteria     -changed,-count[avoid-version,solution]
# upgrade-criteria     -count[avoid-version,solution]
# jobs                 71
# repositories         1 (version-controlled)
# pinned               1 (version)
# current-switch       5.4
# invariant            ["ocaml-base-compiler" {= "5.4.0"}]
# compiler-packages    ocaml-base-compiler.5.4.0, ocaml-compiler.5.4.0, ocaml-options-vanilla.1
# ocaml:native         true
# ocaml:native-tools   true
# ocaml:native-dynlink true
# ocaml:stubsdir       /home/opam/.opam/5.4/lib/ocaml/stublibs:/home/opam/.opam/5.4/lib/ocaml
# ocaml:preinstalled   false
# ocaml:compiler       5.4.0
2026-03-25 21:42.56 ---> using "ed86081cb38ca125a920162bfe6a4bb7b1c27c6973c917551687c83cf44dbfdf" from cache

/home/opam: (env OPAMDOWNLOADJOBS 1)

/home/opam: (env OPAMERRLOGLEN 0)

/home/opam: (env OPAMPRECISETRACKING 1)

/home/opam: (env CI true)

/home/opam: (env OPAM_REPO_CI true)

/home/opam: (run (shell "rm -rf opam-repository/"))
2026-03-25 21:42.56 ---> using "04a48515eea40c32b96da0c71328b4bba0edb66eed83d4f78554b39097cf1f25" from cache

/home/opam: (copy (src .) (dst opam-repository/))
2026-03-25 21:42.58 ---> using "034191995d824300f355cbba1072d6e5fe6d815701f24eb84d82c75009d73829" from cache

/home/opam: (run (shell "opam repository set-url --strict default opam-repository/"))
[default] Initialised
2026-03-25 21:42.58 ---> using "8232259ea36ea8848dc29ae49703acf145fd27b40f3ebd8fb785db7f8da1b9d4" from cache

/home/opam: (run (network host)
                 (shell "opam update --depexts || true"))
+ /usr/bin/sudo "apt-get" "update"
- Get:1 http://deb.debian.org/debian trixie InRelease [140 kB]
- Get:2 http://deb.debian.org/debian trixie-updates InRelease [47.3 kB]
- Get:3 http://deb.debian.org/debian-security trixie-security InRelease [43.4 kB]
- Get:4 http://deb.debian.org/debian trixie/main amd64 Packages [9671 kB]
- Get:5 http://deb.debian.org/debian-security trixie-security/main amd64 Packages [114 kB]
- Fetched 10.0 MB in 2s (6318 kB/s)
- Reading package lists...
- 
2026-03-25 21:42.58 ---> using "a75782a571df4fc8f8933e94c681af881015ee87cdd4c652f8ae9af1d8cfad37" from cache

/home/opam: (run (shell "opam pin add -k version -yn ocaml-compiler.5.4.0~rc1 5.4.0~rc1"))
ocaml-compiler is now pinned to version 5.4.0~rc1
2026-03-25 21:42.58 ---> using "27ab7a5f0bff149d4782fba34c0f12f25c2745e4b7ce18ded4528e7b01215403" from cache

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell  "opam reinstall --update-invariant ocaml-compiler.5.4.0~rc1;\
                        \n        res=$?;\
                        \n        test \"$res\" != 31 && exit \"$res\";\
                        \n        export OPAMCLI=2.0;\
                        \n        build_dir=$(opam var prefix)/.opam-switch/build;\
                        \n        failed=$(ls \"$build_dir\");\
                        \n        partial_fails=\"\";\
                        \n        for pkg in $failed; do\
                        \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"debian-13\\\"\"; then\
                        \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
                        \n          fi;\
                        \n          test \"$pkg\" != 'ocaml-compiler.5.4.0~rc1' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))
ocaml-compiler.5.4.0~rc1 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== remove 1 package
  - remove    ocaml-base-compiler 5.4.0 (pinned)              [conflicts with ocaml-compiler]
=== downgrade 1 package
  - downgrade ocaml-compiler      5.4.0 to 5.4.0~rc1 (pinned)
=== recompile 6 packages
  - recompile base-domains        base                        [uses ocaml]
  - recompile base-effects        base                        [uses ocaml]
  - recompile base-nnp            base                        [uses base-domains]
  - recompile ocaml               5.4.0                       [uses ocaml-base-compiler]
  - recompile ocaml-config        3                           [uses ocaml-base-compiler]
  - recompile opam-depext         1.2.3                       [uses ocaml]
=== install 1 package
  - install   ocaml-variants      5.4.0~rc1+options           [required by ocaml]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved ocaml-compiler.5.4.0~rc1  (cached)
-> retrieved ocaml-config.3  (cached)
-> retrieved opam-depext.1.2.3  (cached)
-> removed   base-effects.base
-> removed   base-nnp.base
-> removed   base-domains.base
-> removed   opam-depext.1.2.3
-> removed   ocaml.5.4.0
-> removed   ocaml-config.3
-> removed   ocaml-base-compiler.5.4.0
-> removed   ocaml-compiler.5.4.0
-> installed ocaml-compiler.5.4.0~rc1
-> installed ocaml-variants.5.4.0~rc1+options
-> installed ocaml-config.3
-> installed ocaml.5.4.0
-> installed base-domains.base
-> installed base-effects.base
-> installed base-nnp.base
-> installed opam-depext.1.2.3
[NOTE] Switch invariant was updated to ["ocaml-variants" {= "5.4.0~rc1+options"}]
       Use `opam switch set-invariant' to change it.
Done.

<><> opam-depext.1.2.3 installed successfully <><><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# To update the current shell environment, run: eval $(opam env)
2026-03-25 21:42.58 ---> using "b49b6ed909e77c558f677915e871ebeabba006ff37f3f132a79670cd2a9f5db8" from cache

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell  "opam reinstall cb-check.0.1;\
                        \n        res=$?;\
                        \n        test \"$res\" != 31 && exit \"$res\";\
                        \n        export OPAMCLI=2.0;\
                        \n        build_dir=$(opam var prefix)/.opam-switch/build;\
                        \n        failed=$(ls \"$build_dir\");\
                        \n        partial_fails=\"\";\
                        \n        for pkg in $failed; do\
                        \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"debian-13\\\"\"; then\
                        \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
                        \n          fi;\
                        \n          test \"$pkg\" != 'cb-check.0.1' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))
cb-check.0.1 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== install 3 packages
  - install cb-check 0.1
  - install dune     3.22.0 [required by cb-check]
  - install yojson   3.0.0  [required by cb-check]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved cb-check.0.1  (cached)
-> retrieved dune.3.22.0  (cached)
-> retrieved yojson.3.0.0  (cached)
-> installed dune.3.22.0
-> installed yojson.3.0.0
[ERROR] The compilation of cb-check.0.1 failed at "dune build -p cb-check -j 71 @install".

#=== ERROR while compiling cb-check.0.1 =======================================#
# context              2.5.0 | linux/x86_64 | ocaml-variants.5.4.0~rc1+options | file:///home/opam/opam-repository
# path                 ~/.opam/5.4/.opam-switch/build/cb-check.0.1
# command              ~/.opam/opam-init/hooks/sandbox.sh build dune build -p cb-check -j 71 @install
# exit-code            1
# env-file             ~/.opam/log/cb-check-7-767449.env
# output-file          ~/.opam/log/cb-check-7-767449.out
### output ###
# (cd _build/default && /home/opam/.opam/5.4/bin/ocamlopt.opt -w -40 -g -I cb-check/.main.eobjs/byte -I cb-check/.main.eobjs/native -I /home/opam/.opam/5.4/lib/yojson -cmi-file cb-check/.main.eobjs/byte/dune__exe__Main.cmi -no-alias-deps -open Dune__exe -o cb-check/.main.eobjs/native/dune__exe__Main.cmx -c -impl cb-check/main.ml)
# File "cb-check/main.ml", line 19, characters 34-35:
# 19 |         match Cb_schema.S.of_json j with
#                                        ^
# Error: The value j has type
#          Yojson.Safe.t =
#            [ `Assoc of (string * Yojson.Safe.t) list
#            | `Bool of bool
#            | `Float of float
#            | `Int of int
#            | `Intlit of string
#            | `List of Yojson.Safe.t list
#            | `Null
#            | `String of string ]
#        but an expression was expected of type
#          [> `Assoc of
#               (string *
#                [> `List of
#                     [> `Assoc of
#                          (string *
#                           [> `Assoc of
#                                (string *
#                                 [> `Assoc of
#                                      (string *
#                                       [> `Float of float
#                                        | `Int of int
#                                        | `Intlit of string
#                                        | `Null
#                                        | `String of string ])
#                                      list
#                                  | `Float of float
#                                  | `Int of int
#                                  | `Intlit of string
#                                  | `List of
#                                      [> `Float of float
#                                       | `Int of int
#                                       | `Intlit of string
#                                       | `Null
#                                       | `String of string ]
#                                      list
#                                  | `Null
#                                  | `String of string ])
#                                list
#                            | `List of
#                                [> `Assoc of
#                                     (string *
#                                      [> `Assoc of
#                                           (string *
#                                            [> `Float of float
#                                             | `Int of int
#                                             | `Intlit of string
#                                             | `Null
#                                             | `String of string ])
#                                           list
#                                       | `Float of float
#                                       | `Int of int
#                                       | `Intlit of string
#                                       | `List of
#                                           [> `Float of float
#                                            | `Int of int
#                                            | `Intlit of string
#                                            | `List of
#                                                [> `Float of float ] list
#                                            | `Null
#                                            | `String of string ]
#                                           list
#                                       | `Null
#                                       | `String of string ])
#                                     list ]
#                                list
#                            | `Null
#                            | `String of string ])
#                          list ]
#                     list
#                 | `Null
#                 | `String of string
#                 | `Tuple of [> `Int of int ] list ])
#               list ]
#        Type
#          Yojson.Safe.t =
#            [ `Assoc of (string * Yojson.Safe.t) list
#            | `Bool of bool
#            | `Float of float
#            | `Int of int
#            | `Intlit of string
#            | `List of Yojson.Safe.t list
#            | `Null
#            | `String of string ]
#        is not compatible with type
#          [> `List of
#               [> `Assoc of
#                    (string *
#                     [> `Assoc of
#                          (string *
#                           [> `Assoc of
#                                (string *
#                                 [> `Float of float
#                                  | `Int of int
#                                  | `Intlit of string
#                                  | `Null
#                                  | `String of string ])
#                                list
#                            | `Float of float
#                            | `Int of int
#                            | `Intlit of string
#                            | `List of
#                                [> `Float of float
#                                 | `Int of int
#                                 | `Intlit of string
#                                 | `Null
#                                 | `String of string ]
#                                list
#                            | `Null
#                            | `String of string ])
#                          list
#                      | `List of
#                          [> `Assoc of
#                               (string *
#                                [> `Assoc of
#                                     (string *
#                                      [> `Float of float
#                                       | `Int of int
#                                       | `Intlit of string
#                                       | `Null
#                                       | `String of string ])
#                                     list
#                                 | `Float of float
#                                 | `Int of int
#                                 | `Intlit of string
#                                 | `List of
#                                     [> `Float of float
#                                      | `Int of int
#                                      | `Intlit of string
#                                      | `List of [> `Float of float ] list
#                                      | `Null
#                                      | `String of string ]
#                                     list
#                                 | `Null
#                                 | `String of string ])
#                               list ]
#                          list
#                      | `Null
#                      | `String of string ])
#                    list ]
#               list
#           | `Null
#           | `String of string
#           | `Tuple of [> `Int of int ] list ]
#        The first variant type does not allow tag(s) `Tuple



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - build cb-check 0.1
+- 
+- The following changes have been performed
| - install dune   3.22.0
| - install yojson 3.0.0
+- 
# To update the current shell environment, run: eval $(opam env)

The former state can be restored with:
    /usr/bin/opam switch import "/home/opam/.opam/5.4/.opam-switch/backup/state-20260325214259.export"
[WARNING] OPAMCONFIRMLEVEL was ignored because CLI 2.0 was requested and it was introduced in 2.1.
[WARNING] OPAMCONFIRMLEVEL was ignored because CLI 2.0 was requested and it was introduced in 2.1.
"/usr/bin/env" "bash" "-c" "opam reinstall cb-check.0.1;
        res=$?;
        test "$res" != 31 && exit "$res";
        export OPAMCLI=2.0;
        build_dir=$(opam var prefix)/.opam-switch/build;
        failed=$(ls "$build_dir");
        partial_fails="";
        for pkg in $failed; do
          if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"debian-13\""; then
            echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.";
          fi;
          test "$pkg" != 'cb-check.0.1' && partial_fails="$partial_fails $pkg";
        done;
        test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}";
        exit 1" failed with exit status 1
2026-03-25 21:45.10: Job failed: Failed: Build failed
2026-03-25 21:45.10: Log analysis:
2026-03-25 21:45.10: >>> 
[ERROR] The compilation of cb-check.0.1 failed at "dune build -p cb-check -j 71 @install".
 (score = 20)
2026-03-25 21:45.10: >>> 
# Error: The value j has type
 (score = 48)
2026-03-25 21:45.10: The value j has type