Organisationsocaml-multicoreeio1234a0 ()(lower-bound)

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2024-10-28 11:35.43: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/772/head (1234a0bd4c4d78e20df9976d76c51809adc0aff9) (linux-x86_64:(lower-bound))
Base: ocaml/opam:debian-12-ocaml-5.1@sha256:8f56ed204049da44e6929f71bd0a97fea51803eb0925bf30aab63f51752a06bd
Opam project build

To reproduce locally:

git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/772/head" && git reset --hard 1234a0bd
cat > Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-12-ocaml-5.1@sha256:8f56ed204049da44e6929f71bd0a97fea51803eb0925bf30aab63f51752a06bd
# debian-12-5.1_opam-2.2
USER 1000:1000
ENV CLICOLOR_FORCE="1"
ENV OPAMCOLOR="always"
WORKDIR /src
RUN sudo ln -f /usr/bin/opam-2.2 /usr/bin/opam
RUN opam init --reinit -ni
RUN uname -rs && opam exec -- ocaml -version && opam --version
WORKDIR /src
RUN sudo chown opam /src
RUN cd ~/opam-repository && (git cat-file -e 45f961713f04a0d83218c0eb2706131a40f96d54 || git fetch origin master) && git reset -q --hard 45f961713f04a0d83218c0eb2706131a40f96d54 && git log --no-decorate -n1 --oneline && opam update -u
COPY --chown=1000:1000 eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam ./
RUN opam pin add -yn eio_windows.dev './' && \
    opam pin add -yn eio_posix.dev './' && \
    opam pin add -yn eio_main.dev './' && \
    opam pin add -yn eio_linux.dev './' && \
    opam pin add -yn eio.dev './'
ENV DEPS="afl-persistent.1.1 alcotest.1.7.0 astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigarray-compat.1.1.0 bigstringaf.0.9.0 camlp-streams.5.0 cmdliner.1.1.0 conf-pkg-config.1.0 containers.3.7 cppo.1.6.6 crowbar.0.2.1 csexp.1.3.2 cstruct.6.0.1 domain-local-await.0.1.0 dscheck.0.1.0 dune.3.9.0 dune-configurator.2.7.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-x86_64.1 host-system-other.1 iomux.0.2 kcas.0.3.0 logs.0.7.0 lwt.5.7.0 lwt-dllist.1.0.0 mdx.2.4.1 mtime.2.0.0 ocaml.5.1.1 ocaml-base-compiler.5.1.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.2.4.0 ocamlbuild.0.14.2 ocamlfind.1.9.5 ocplib-endian.1.1 optint.0.1.0 oseq.0.4.1 psq.0.2.0 re.1.9.0 result.1.5 seq.0.3 stdlib-shims.0.1.0 topkg.1.0.6 uring.0.9 uutf.1.0.3 yojson.2.0.2"
ENV CI="true"
ENV OCAMLCI="true"
RUN opam update --depexts && opam install --cli=2.2 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio_linux.dev eio.dev $DEPS
RUN opam install $DEPS
COPY --chown=1000:1000 . /src
RUN opam exec -- dune build @install @check @runtest && rm -rf _build

END-OF-DOCKERFILE
docker build .
END-REPRO-BLOCK

2024-10-28 11:35.43: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-12-ocaml-5.1@sha256:8f56ed204049da44e6929f71bd0a97fea51803eb0925bf30aab63f51752a06bd-debian-12-5.1_opam-2.2-3674fcb4ed4a79c86b0c3ebeb33fec66"
2024-10-28 11:35.43: Using OBuilder spec:
((from ocaml/opam:debian-12-ocaml-5.1@sha256:8f56ed204049da44e6929f71bd0a97fea51803eb0925bf30aab63f51752a06bd)
 (comment debian-12-5.1_opam-2.2)
 (user (uid 1000) (gid 1000))
 (env CLICOLOR_FORCE 1)
 (env OPAMCOLOR always)
 (workdir /src)
 (run (shell "sudo ln -f /usr/bin/opam-2.2 /usr/bin/opam"))
 (run (shell "opam init --reinit -ni"))
 (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
 (workdir /src)
 (run (shell "sudo chown opam /src"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "cd ~/opam-repository && (git cat-file -e 45f961713f04a0d83218c0eb2706131a40f96d54 || git fetch origin master) && git reset -q --hard 45f961713f04a0d83218c0eb2706131a40f96d54 && git log --no-decorate -n1 --oneline && opam update -u"))
 (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
       (dst ./))
 (run (network host)
      (shell  "opam pin add -yn eio_windows.dev './' && \
             \nopam pin add -yn eio_posix.dev './' && \
             \nopam pin add -yn eio_main.dev './' && \
             \nopam pin add -yn eio_linux.dev './' && \
             \nopam pin add -yn eio.dev './'"))
 (env DEPS "afl-persistent.1.1 alcotest.1.7.0 astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigarray-compat.1.1.0 bigstringaf.0.9.0 camlp-streams.5.0 cmdliner.1.1.0 conf-pkg-config.1.0 containers.3.7 cppo.1.6.6 crowbar.0.2.1 csexp.1.3.2 cstruct.6.0.1 domain-local-await.0.1.0 dscheck.0.1.0 dune.3.9.0 dune-configurator.2.7.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-x86_64.1 host-system-other.1 iomux.0.2 kcas.0.3.0 logs.0.7.0 lwt.5.7.0 lwt-dllist.1.0.0 mdx.2.4.1 mtime.2.0.0 ocaml.5.1.1 ocaml-base-compiler.5.1.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.2.4.0 ocamlbuild.0.14.2 ocamlfind.1.9.5 ocplib-endian.1.1 optint.0.1.0 oseq.0.4.1 psq.0.2.0 re.1.9.0 result.1.5 seq.0.3 stdlib-shims.0.1.0 topkg.1.0.6 uring.0.9 uutf.1.0.3 yojson.2.0.2")
 (env CI true)
 (env OCAMLCI true)
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "opam update --depexts && opam install --cli=2.2 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio_linux.dev eio.dev $DEPS"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "opam install $DEPS"))
 (copy (src .) (dst /src))
 (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))
)

2024-10-28 11:35.43: Waiting for resource in pool OCluster
2024-10-28 11:35.43: Waiting for worker…
2024-10-28 11:35.43: Got resource from pool OCluster
Building on x86-bm-c3.sw.ocaml.org
HEAD is now at 2c3c5e1 Update fs.md
HEAD is now at 1234a0b Update fs.md

(from ocaml/opam:debian-12-ocaml-5.1@sha256:8f56ed204049da44e6929f71bd0a97fea51803eb0925bf30aab63f51752a06bd)
2024-10-28 11:35.44 ---> using "6ee1fe27fa6366d6c0b58a456592efca1ae7ebcb8c8dad869bb23ac981216fb0" from cache

/: (comment debian-12-5.1_opam-2.2)

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

/: (env CLICOLOR_FORCE 1)

/: (env OPAMCOLOR always)

/: (workdir /src)

/src: (run (shell "sudo ln -f /usr/bin/opam-2.2 /usr/bin/opam"))
2024-10-28 11:35.44 ---> using "6a24b6cb73c51a11c75fbb3191dc39a79e6790a27c44d546251bcc73257f5686" from cache

/src: (run (shell "opam init --reinit -ni"))
Configuring from /home/opam/.opamrc and then 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 development 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] synchronised from file:///home/opam/opam-repository
2024-10-28 11:35.44 ---> using "0527ed178742bb6836c7a51d982ad14d0832a4af434baff4df75370a2366a53b" from cache

/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
Linux 5.15.0-122-generic
The OCaml toplevel, version 5.1.1
2.2.1
2024-10-28 11:35.44 ---> using "d4efa778e76d18b1621f65f6d9a8d0528163cbd59ee7813e322545c8f673f5c1" from cache

/src: (workdir /src)

/src: (run (shell "sudo chown opam /src"))
2024-10-28 11:35.44 ---> using "ae75443227cfa8d931b4f3963f6f77307159c4697ad5d732a30bff47fd31971d" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "cd ~/opam-repository && (git cat-file -e 45f961713f04a0d83218c0eb2706131a40f96d54 || git fetch origin master) && git reset -q --hard 45f961713f04a0d83218c0eb2706131a40f96d54 && git log --no-decorate -n1 --oneline && opam update -u"))
45f961713f Merge pull request #26585 from dra27/trunk-tweaks

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from file:///home/opam/opam-repository

Everything as up-to-date as possible (run with --verbose to show unavailable upgrades).
However, you may "opam upgrade" these packages explicitly, which will ask permission to downgrade or uninstall the conflicting packages.
Nothing to do.
# Run eval $(opam env) to update the current shell environment
2024-10-28 11:35.44 ---> using "19d5067cc413651c35d6fdf2fd8acd0faf1c4fadbe953d9a16d7460f64974a6f" from cache

/src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
            (dst ./))
2024-10-28 11:35.44 ---> using "53212b8d8b20873e95463032a2cf899e2a112f4fb7b05b92975d25a7fb0247be" from cache

/src: (run (network host)
           (shell  "opam pin add -yn eio_windows.dev './' && \
                  \nopam pin add -yn eio_posix.dev './' && \
                  \nopam pin add -yn eio_main.dev './' && \
                  \nopam pin add -yn eio_linux.dev './' && \
                  \nopam pin add -yn eio.dev './'"))
[eio_windows.dev] synchronised (file:///src)
eio_windows is now pinned to file:///src (version dev)
[eio_posix.dev] synchronised (file:///src)
eio_posix is now pinned to file:///src (version dev)
[eio_main.dev] synchronised (file:///src)
eio_main is now pinned to file:///src (version dev)
[eio_linux.dev] synchronised (file:///src)
eio_linux is now pinned to file:///src (version dev)
[eio.dev] synchronised (file:///src)
eio is now pinned to file:///src (version dev)
2024-10-28 11:35.44 ---> using "5e210f0e19600152d732f37d8f713d6204f475ac0cac68a0a121e312987b4f32" from cache

/src: (env DEPS "afl-persistent.1.1 alcotest.1.7.0 astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigarray-compat.1.1.0 bigstringaf.0.9.0 camlp-streams.5.0 cmdliner.1.1.0 conf-pkg-config.1.0 containers.3.7 cppo.1.6.6 crowbar.0.2.1 csexp.1.3.2 cstruct.6.0.1 domain-local-await.0.1.0 dscheck.0.1.0 dune.3.9.0 dune-configurator.2.7.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-x86_64.1 host-system-other.1 iomux.0.2 kcas.0.3.0 logs.0.7.0 lwt.5.7.0 lwt-dllist.1.0.0 mdx.2.4.1 mtime.2.0.0 ocaml.5.1.1 ocaml-base-compiler.5.1.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.2.4.0 ocamlbuild.0.14.2 ocamlfind.1.9.5 ocplib-endian.1.1 optint.0.1.0 oseq.0.4.1 psq.0.2.0 re.1.9.0 result.1.5 seq.0.3 stdlib-shims.0.1.0 topkg.1.0.6 uring.0.9 uutf.1.0.3 yojson.2.0.2")

/src: (env CI true)

/src: (env OCAMLCI true)

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "opam update --depexts && opam install --cli=2.2 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio_linux.dev eio.dev $DEPS"))
+ /usr/bin/sudo "apt-get" "update"
- Hit:1 http://deb.debian.org/debian bookworm InRelease
- Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]
- Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB]
- Get:4 http://deb.debian.org/debian-security bookworm-security/main amd64 Packages [190 kB]
- Fetched 293 kB in 0s (813 kB/s)
- Reading package lists...
- 

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[eio.dev] synchronised (no changes)
[eio_linux.dev] synchronised (no changes)
[eio_main.dev] synchronised (no changes)
[eio_posix.dev] synchronised (no changes)
[eio_windows.dev] synchronised (no changes)

[NOTE] Package ocaml-options-vanilla is already installed (current version is 1).
[NOTE] Package ocaml-config is already installed (current version is 3).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.1.1).
[NOTE] Package ocaml is already installed (current version is 5.1.1).
[NOTE] Package host-system-other is already installed (current version is 1).
[NOTE] Package host-arch-x86_64 is already installed (current version is 1).
[NOTE] Package base-unix is already installed (current version is base).
[NOTE] Package base-threads is already installed (current version is base).
[NOTE] Package base-nnp is already installed (current version is base).
[NOTE] Package base-domains is already installed (current version is base).
[NOTE] Package base-bigarray is already installed (current version is base).

The following system packages will first need to be installed:
    pkg-config

<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>

+ /usr/bin/sudo "apt-get" "install" "-qq" "-yy" "pkg-config"
- debconf: delaying package configuration, since apt-utils is not installed
- Selecting previously unselected package libpkgconf3:amd64.
- (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
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(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 18776 files and directories currently installed.)
- Preparing to unpack .../libpkgconf3_1.8.1-1_amd64.deb ...
- Unpacking libpkgconf3:amd64 (1.8.1-1) ...
- Selecting previously unselected package pkgconf-bin.
- Preparing to unpack .../pkgconf-bin_1.8.1-1_amd64.deb ...
- Unpacking pkgconf-bin (1.8.1-1) ...
- Selecting previously unselected package pkgconf:amd64.
- Preparing to unpack .../pkgconf_1.8.1-1_amd64.deb ...
- Unpacking pkgconf:amd64 (1.8.1-1) ...
- Selecting previously unselected package pkg-config:amd64.
- Preparing to unpack .../pkg-config_1.8.1-1_amd64.deb ...
- Unpacking pkg-config:amd64 (1.8.1-1) ...
- Setting up libpkgconf3:amd64 (1.8.1-1) ...
- Setting up pkgconf-bin (1.8.1-1) ...
- Setting up pkgconf:amd64 (1.8.1-1) ...
- Setting up pkg-config:amd64 (1.8.1-1) ...
- Processing triggers for libc-bin (2.36-9+deb12u8) ...
2024-10-28 11:35.44 ---> using "69f49d7ca4fe7b269cf938a923023e048dc898cca8dbd10b63e75a4e8d40f44b" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "opam install $DEPS"))
[NOTE] Package ocaml-options-vanilla is already installed (current version is 1).
[NOTE] Package ocaml-config is already installed (current version is 3).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.1.1).
[NOTE] Package ocaml is already installed (current version is 5.1.1).
[NOTE] Package host-system-other is already installed (current version is 1).
[NOTE] Package host-arch-x86_64 is already installed (current version is 1).
[NOTE] Package base-unix is already installed (current version is base).
[NOTE] Package base-threads is already installed (current version is base).
[NOTE] Package base-nnp is already installed (current version is base).
[NOTE] Package base-domains is already installed (current version is base).
[NOTE] Package base-bigarray is already installed (current version is base).
The following actions will be performed:
=== install 44 packages
  - install afl-persistent     1.1
  - install alcotest           1.7.0
  - install astring            0.8.5
  - install base-bytes         base
  - install bigarray-compat    1.1.0
  - install bigstringaf        0.9.0
  - install camlp-streams      5.0
  - install cmdliner           1.1.0
  - install conf-pkg-config    1.0
  - install containers         3.7
  - install cppo               1.6.6
  - install crowbar            0.2.1
  - install csexp              1.3.2
  - install cstruct            6.0.1
  - install domain-local-await 0.1.0
  - install dscheck            0.1.0
  - install dune               3.9.0
  - install dune-configurator  2.7.0
  - install either             1.0.0
  - install fmt                0.9.0
  - install hmap               0.8.1
  - install iomux              0.2
  - install kcas               0.3.0
  - install logs               0.7.0
  - install lwt                5.7.0
  - install lwt-dllist         1.0.0
  - install mdx                2.4.1
  - install mtime              2.0.0
  - install ocaml-syntax-shims 1.0.0
  - install ocaml-version      2.4.0
  - install ocamlbuild         0.14.2
  - install ocamlfind          1.9.5
  - install ocplib-endian      1.1
  - install optint             0.1.0
  - install oseq               0.4.1
  - install psq                0.2.0
  - install re                 1.9.0
  - install result             1.5
  - install seq                0.3
  - install stdlib-shims       0.1.0
  - install topkg              1.0.6
  - install uring              0.9
  - install uutf               1.0.3
  - install yojson             2.0.2

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved afl-persistent.1.1  (cached)
-> retrieved bigarray-compat.1.1.0  (cached)
-> retrieved bigstringaf.0.9.0  (cached)
-> retrieved astring.0.8.5  (cached)
-> retrieved alcotest.1.7.0  (cached)
-> retrieved camlp-streams.5.0  (cached)
-> retrieved cmdliner.1.1.0  (cached)
-> retrieved containers.3.7  (cached)
-> installed conf-pkg-config.1.0
-> retrieved cppo.1.6.6  (cached)
-> retrieved crowbar.0.2.1  (cached)
-> retrieved csexp.1.3.2  (cached)
-> retrieved domain-local-await.0.1.0  (cached)
-> retrieved dscheck.0.1.0  (cached)
-> retrieved cstruct.6.0.1  (cached)
-> retrieved either.1.0.0  (cached)
-> retrieved fmt.0.9.0  (cached)
-> retrieved hmap.0.8.1  (cached)
-> retrieved iomux.0.2  (cached)
-> retrieved kcas.0.3.0  (cached)
-> retrieved logs.0.7.0  (cached)
-> retrieved lwt.5.7.0  (cached)
-> retrieved lwt-dllist.1.0.0  (cached)
-> retrieved mdx.2.4.1  (cached)
-> retrieved dune-configurator.2.7.0  (cached)
-> retrieved dune.3.9.0  (cached)
-> retrieved mtime.2.0.0  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml-version.2.4.0  (cached)
-> retrieved ocamlbuild.0.14.2  (cached)
-> retrieved ocamlfind.1.9.5  (cached)
-> retrieved ocplib-endian.1.1  (cached)
-> retrieved optint.0.1.0  (cached)
-> retrieved oseq.0.4.1  (cached)
-> retrieved psq.0.2.0  (cached)
-> retrieved result.1.5  (cached)
-> retrieved seq.0.3  (cached)
-> retrieved stdlib-shims.0.1.0  (cached)
-> retrieved re.1.9.0  (cached)
-> retrieved topkg.1.0.6  (cached)
-> retrieved uutf.1.0.3  (cached)
-> retrieved yojson.2.0.2  (cached)
-> retrieved uring.0.9  (cached)
-> installed cmdliner.1.1.0
-> installed ocamlfind.1.9.5
-> installed base-bytes.base
-> installed ocamlbuild.0.14.2
-> installed topkg.1.0.6
-> installed afl-persistent.1.1
-> installed hmap.0.8.1
-> installed uutf.1.0.3
-> installed mtime.2.0.0
-> installed fmt.0.9.0
-> installed astring.0.8.5
-> installed dune.3.9.0
-> installed bigarray-compat.1.1.0
-> installed bigstringaf.0.9.0
-> installed camlp-streams.5.0
-> installed domain-local-await.0.1.0
-> installed seq.0.3
-> installed result.1.5
-> installed either.1.0.0
-> installed optint.0.1.0
-> installed stdlib-shims.0.1.0
-> installed cppo.1.6.6
-> installed kcas.0.3.0
-> installed cstruct.6.0.1
-> installed ocaml-version.2.4.0
-> installed csexp.1.3.2
-> installed psq.0.2.0
-> installed oseq.0.4.1
-> installed ocplib-endian.1.1
-> installed ocaml-syntax-shims.1.0.0
-> installed dune-configurator.2.7.0
-> installed re.1.9.0
-> installed crowbar.0.2.1
-> installed iomux.0.2
-> installed yojson.2.0.2
-> installed alcotest.1.7.0
-> installed containers.3.7
-> installed dscheck.0.1.0
-> installed uring.0.9
-> installed lwt.5.7.0
-> installed lwt-dllist.1.0.0
-> installed logs.0.7.0
-> installed mdx.2.4.1
Done.
# Run eval $(opam env) to update the current shell environment
2024-10-28 11:35.44 ---> using "8f2d59af077925d80240b553dbca13c3edfc04a5e19b1512c22ee30765d81675" from cache

/src: (copy (src .) (dst /src))
2024-10-28 11:35.44 ---> saved as "81675a7a403021a99a6eb081a1b967681a5f9e0a358970c5208fd42ce2fed4dd"

/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))
(cd _build/default/fuzz && ./fuzz_inherit_fds.exe)
inherit_fds: PASS

(cd _build/default/fuzz && ./fuzz_buf_read.exe)
random ops: PASS

(cd _build/default/fuzz && ./fuzz_buf_write.exe)
random ops: PASS

(cd _build/default/lib_eio_linux/tests && ./test.exe)
Testing `eio_linux'.
This run has ID `YABT4GHN'.

  [OK]          io          0   copy.
  [OK]          io          1   direct_copy.
  [OK]          io          2   poll_add.
  [OK]          io          3   poll_add_busy.
  [OK]          io          4   iovec.
  [OK]          io          5   no_sqe.
  [OK]          io          6   read_exact.
  [OK]          io          7   expose_backend.
  [OK]          io          8   statx.
  [OK]          io          9   signal_race.
  [OK]          io         10   alloc-fixed-or-wait.

Full test results in `/src/_build/default/lib_eio_linux/tests/_build/_tests/eio_linux'.
Test Successful in 0.008s. 11 tests run.
File "tests/fs.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/fs.md _build/default/tests/.mdx/fs.md.corrected
diff --git a/_build/default/tests/fs.md b/_build/default/tests/.mdx/fs.md.corrected
index 5a31512..135cc1d 100644
--- a/_build/default/tests/fs.md
+++ b/_build/default/tests/.mdx/fs.md.corrected
@@ -100,6 +100,10 @@ let try_chmod ~perm path =
   | exception ex -> Eio.traceln "@[<h>%a@]" Eio.Exn.pp ex
 
 ```
+```mdx-error
+Line 12, characters 30-33:
+Error: Unbound value env
+```
 
 # Basic test cases
 
@@ -110,16 +114,15 @@ Creating a file and reading it back:
   let cwd = Eio.Stdenv.cwd env in
   Path.save ~create:(`Exclusive 0o666) (cwd / "test-file") "my-data";
   traceln "Got %S" @@ Path.load (cwd / "test-file");;
-+Got "my-data"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Check the file got the correct permissions (subject to the umask set above):
 
 ```ocaml
 # Printf.printf "Perm = %o\n" ((Unix.stat "test-file").st_perm);;
-Perm = 644
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOENT, "stat", "test-file")
 ```
 
 # Sandboxing
@@ -131,8 +134,8 @@ Trying to use cwd to access a file outside of that subtree fails:
   let cwd = Eio.Stdenv.cwd env in
   Path.save ~create:(`Exclusive 0o666) (cwd / "../test-file") "my-data";
   failwith "Should have failed";;
-Exception: Eio.Io Fs Permission_denied _,
-  opening <cwd:../test-file>
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Trying to use cwd to access an absolute path fails:
@@ -142,8 +145,8 @@ Trying to use cwd to access an absolute path fails:
   let cwd = Eio.Stdenv.cwd env in
   Path.save ~create:(`Exclusive 0o666) (cwd / "/tmp/test-file") "my-data";
   failwith "Should have failed";;
-Exception: Eio.Io Fs Permission_denied _,
-  opening <cwd:/tmp/test-file>
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Creation modes
@@ -156,8 +159,8 @@ Exclusive create fails if already exists:
   Path.save ~create:(`Exclusive 0o666) (cwd / "test-file") "first-write";
   Path.save ~create:(`Exclusive 0o666) (cwd / "test-file") "first-write";
   failwith "Should have failed";;
-Exception: Eio.Io Fs Already_exists _,
-  opening <cwd:test-file>
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 If-missing create succeeds if already exists:
@@ -169,8 +172,8 @@ If-missing create succeeds if already exists:
   Path.save ~create:(`If_missing 0o666) test_file "1st-write-original";
   Path.save ~create:(`If_missing 0o666) test_file "2nd-write";
   traceln "Got %S" @@ Path.load test_file;;
-+Got "2nd-write-original"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Truncate create succeeds if already exists, and truncates:
@@ -182,10 +185,10 @@ Truncate create succeeds if already exists, and truncates:
   Path.save ~create:(`Or_truncate 0o666) test_file "1st-write-original";
   Path.save ~create:(`Or_truncate 0o666) test_file "2nd-write";
   traceln "Got %S" @@ Path.load test_file;;
-+Got "2nd-write"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 # Unix.unlink "test-file";;
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOENT, "unlink", "test-file")
 ```
 
 Error if no create and doesn't exist:
@@ -196,8 +199,8 @@ Error if no create and doesn't exist:
   let test_file = (cwd / "test-file") in
   Path.save ~create:`Never test_file "1st-write-original";
   traceln "Got %S" @@ Path.load test_file;;
-Exception: Eio.Io Fs Not_found _,
-  opening <cwd:test-file>
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Appending to an existing file:
@@ -209,10 +212,10 @@ Appending to an existing file:
   Path.save ~create:(`Or_truncate 0o666) test_file "1st-write-original";
   Path.save ~create:`Never ~append:true test_file "2nd-write";
   traceln "Got %S" @@ Path.load test_file;;
-+Got "1st-write-original2nd-write"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 # Unix.unlink "test-file";;
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOENT, "unlink", "test-file")
 ```
 
 # Mkdir
@@ -224,13 +227,12 @@ Appending to an existing file:
   try_mkdir (cwd / "subdir/nested");
   Path.save ~create:(`Exclusive 0o600) (cwd / "subdir/nested/test-file") "data";
   ();;
-+mkdir <cwd:subdir> -> ok
-+mkdir <cwd:subdir/nested> -> ok
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 # Unix.unlink "subdir/nested/test-file";
   Unix.rmdir "subdir/nested";
   Unix.rmdir "subdir";;
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOENT, "unlink", "subdir/nested/test-file")
 ```
 
 Creating directories with nesting, symlinks, etc:
@@ -248,13 +250,8 @@ Creating directories with nesting, symlinks, etc:
   try_mkdir (cwd / "to-subdir");
   try_mkdir (cwd / "dangle/foo");
   ();;
-+mkdir <cwd:subdir> -> ok
-+mkdir <cwd:to-subdir/nested> -> ok
-+Eio.Io Fs Permission_denied _, creating directory <cwd:to-root/tmp/foo>
-+Eio.Io Fs Permission_denied _, creating directory <cwd:../foo>
-+Eio.Io Fs Already_exists _, creating directory <cwd:to-subdir>
-+Eio.Io Fs Not_found _, creating directory <cwd:dangle/foo>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Split
@@ -263,40 +260,55 @@ Creating directories with nesting, symlinks, etc:
 let fake_dir : Eio.Fs.dir_ty r = Eio.Resource.T ((), Eio.Resource.handler [])
 let split path = Eio.Path.split (fake_dir, path) |> Option.map (fun ((_, dirname), basename) -> dirname, basename)
 ```
+```mdx-error
+Line 1, characters 30-31:
+Error: Unbound type constructor r
+```
 
 ```ocaml
 # split "foo/bar";
-- : (string * string) option = Some ("foo", "bar")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "/foo/bar";
-- : (string * string) option = Some ("/foo", "bar")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "/foo/bar/baz";
-- : (string * string) option = Some ("/foo/bar", "baz")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "/foo/bar//baz/";
-- : (string * string) option = Some ("/foo/bar", "baz")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "bar";
-- : (string * string) option = Some ("", "bar")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "/bar";
-- : (string * string) option = Some ("/", "bar")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split ".";
-- : (string * string) option = Some ("", ".")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "./";
-- : (string * string) option = Some ("", ".")
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "";
-- : (string * string) option = None
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "/";
-- : (string * string) option = None
+Line 1, characters 1-6:
+Error: Unbound value split
 
 # split "///";
-- : (string * string) option = None
+Line 1, characters 1-6:
+Error: Unbound value split
 ```
 
 # Mkdirs
@@ -315,12 +327,8 @@ Recursively creating directories with `mkdirs`.
   try_mkdirs one_more;
   assert (Eio.Path.is_directory one_more);
   try_mkdirs (cwd / ".." / "outside");
-+mkdirs <cwd:subdir1/subdir2/subdir3> -> ok
-+mkdirs <cwd:subdir1/subdir2/subdir3/subdir4> -> ok
-+mkdirs <cwd:subdir1/subdir2/subdir3/subdir4> -> ok
-+Eio.Io Fs Already_exists _, creating directory <cwd:subdir1/subdir2/subdir3/subdir4>
-+Eio.Io Fs Permission_denied _, examining <cwd:..>, creating directory <cwd:../outside>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Some edge cases for `mkdirs`.
@@ -334,11 +342,8 @@ Some edge cases for `mkdirs`.
   try_mkdirs (cwd / lots_of_slashes);
   assert (Eio.Path.is_directory (cwd / lots_of_slashes));
   try_mkdirs (cwd / "..");;
-+Eio.Io Fs Already_exists _, creating directory <cwd:.>
-+Eio.Io Fs Already_exists _, creating directory <cwd:././>
-+mkdirs <cwd:./test//////////////test> -> ok
-+Eio.Io Fs Permission_denied _, creating directory <cwd:..>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Unlink
@@ -362,16 +367,8 @@ You can remove a file using unlink:
   try_write_file ~create:(`Exclusive 0o600) (cwd / "subdir/file2") "data2";
   try_unlink (cwd / "to-subdir/file2");
   try_read_file (cwd / "subdir/file2");;
-+read <cwd:file> -> "data"
-+read <cwd:subdir/file2> -> "data2"
-+unlink <cwd:file> -> ok
-+unlink <cwd:subdir/file2> -> ok
-+Eio.Io Fs Not_found _, opening <cwd:file>
-+Eio.Io Fs Not_found _, opening <cwd:subdir/file2>
-+write <cwd:subdir/file2> -> ok
-+unlink <cwd:to-subdir/file2> -> ok
-+Eio.Io Fs Not_found _, opening <cwd:subdir/file2>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Removing something that doesn't exist or is out of scope:
@@ -384,11 +381,8 @@ Removing something that doesn't exist or is out of scope:
   try_unlink (cwd / "../foo");
   try_unlink (cwd / "to-subdir/foo");
   try_unlink (cwd / "to-root/foo");;
-+Eio.Io Fs Not_found _, removing file <cwd:missing>
-+Eio.Io Fs Permission_denied _, removing file <cwd:../foo>
-+Eio.Io Fs Not_found _, removing file <cwd:to-subdir/foo>
-+Eio.Io Fs Permission_denied _, removing file <cwd:to-root/foo>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Reads and writes follow symlinks, but unlink operates on the symlink itself:
@@ -428,22 +422,8 @@ Reads and writes follow symlinks, but unlink operates on the symlink itself:
   Path.unlink (cwd / "link1");
   Path.unlink (cwd / "linkdir");
   Path.unlink (cwd / "linkroot")
-+mkdir <cwd:dir1> -> ok
-+write <cwd:dir1/file1> -> ok
-+write <cwd:file2> -> ok
-+read <cwd:dir1/file1> -> "data1"
-+read <cwd:link1> -> "data1"
-+read <cwd:linkdir/file1> -> "data1"
-+<cwd:dir1/file1> -> regular file
-+<cwd:link1> -> symbolic link / regular file
-+<cwd:linkdir> -> symbolic link / directory
-+<cwd:linkroot> -> symbolic link / Fs Permission_denied _
-+<fs:linkroot> -> symbolic link / directory
-+chdir "dir1"
-+read <cwd:file1> -> "data1"
-+chdir ".."
-+read <cwd:file2> -> "data2"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Rmdir
@@ -465,18 +445,8 @@ Similar to `unlink`, but works on directories:
   try_mkdir (cwd / "subdir/d3");
   try_rmdir (cwd / "to-subdir/d3");
   try_read_dir (cwd / "subdir/d3");;
-+mkdir <cwd:d1> -> ok
-+mkdir <cwd:subdir/d2> -> ok
-+read_dir <cwd:d1> -> []
-+read_dir <cwd:subdir/d2> -> []
-+rmdir <cwd:d1> -> ok
-+rmdir <cwd:subdir/d2> -> ok
-+Eio.Io Fs Not_found _, reading directory <cwd:d1>
-+Eio.Io Fs Not_found _, reading directory <cwd:subdir/d2>
-+mkdir <cwd:subdir/d3> -> ok
-+rmdir <cwd:to-subdir/d3> -> ok
-+Eio.Io Fs Not_found _, reading directory <cwd:subdir/d3>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Removing something that doesn't exist or is out of scope:
@@ -489,11 +459,8 @@ Removing something that doesn't exist or is out of scope:
   try_rmdir (cwd / "../foo");
   try_rmdir (cwd / "to-subdir/foo");
   try_rmdir (cwd / "to-root/foo");;
-+Eio.Io Fs Not_found _, removing directory <cwd:missing>
-+Eio.Io Fs Permission_denied _, removing directory <cwd:../foo>
-+Eio.Io Fs Not_found _, removing directory <cwd:to-subdir/foo>
-+Eio.Io Fs Permission_denied _, removing directory <cwd:to-root/foo>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Recursive removal
@@ -511,14 +478,8 @@ Removing something that doesn't exist or is out of scope:
   try_rmtree ~missing_ok:true foo;
   traceln "But not without:";
   try_rmtree ~missing_ok:false foo;
-+mkdirs <cwd:foo/bar/baz> -> ok
-+write <cwd:foo/bar/file1> -> ok
-+rmtree <cwd:foo> -> ok
-+A second rmtree is OK with missing_ok:
-+rmtree <cwd:foo> -> ok
-+But not without:
-+Eio.Io Fs Not_found _, removing file <cwd:foo>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Limiting to a subdirectory
@@ -534,10 +495,8 @@ Create a sandbox, write a file with it, then read it from outside:
   Path.save ~create:(`Exclusive 0o600) (subdir / "test-file") "data";
   try_mkdir (subdir / "../new-sandbox");
   traceln "Got %S" @@ Path.load (cwd / "sandbox/test-file");;
-+mkdir <cwd:sandbox> -> ok
-+Eio.Io Fs Permission_denied _, creating directory <sandbox:../new-sandbox>
-+Got "data"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 ```ocaml
@@ -567,17 +526,8 @@ Create a sandbox, write a file with it, then read it from outside:
   Path.symlink ~link_to:"/" (cwd / "foo/root");
   reject (cwd / "foo/root/..");
   reject (cwd / "missing");
-+open_dir <cwd:foo/bar> -> OK
-+Eio.Io Fs Permission_denied _, opening directory <cwd:..>
-+open_dir <cwd:.> -> OK
-+Eio.Io Fs Permission_denied _, opening directory <cwd:/>
-+open_dir <cwd:foo/bar/..> -> OK
-+open_dir <fs:foo/bar> -> OK
-+open_dir <cwd:foo/up/foo/bar> -> OK
-+Eio.Io Fs Permission_denied _, opening directory <cwd:foo/up/../bar>
-+Eio.Io Fs Permission_denied _, opening directory <cwd:foo/root/..>
-+Eio.Io Fs Not_found _, opening directory <cwd:missing>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 
 # Eio.Exn.Backend.show := false
 - : unit = ()
@@ -602,14 +552,8 @@ Using `cwd` we can't access the parent, but using `fs` we can:
   );
   Unix.unlink "test-file";
   Unix.rmdir "outside-cwd";;
-+mkdir <cwd:fs-test> -> ok
-+chdir "fs-test"
-+Eio.Io Fs Permission_denied _, creating directory <cwd:../outside-cwd>
-+Eio.Io Fs Permission_denied _, opening <cwd:../test-file>
-+mkdir <fs:../outside-cwd> -> ok
-+write <fs:../test-file> -> ok
-+chdir ".."
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Reading directory entries under `cwd` and outside of `cwd`.
@@ -628,16 +572,8 @@ Reading directory entries under `cwd` and outside of `cwd`.
   try_read_dir (tmpdir / "test-3");
   Path.symlink ~link_to:"test-1" (cwd / "readdir/link-1");
   try_read_dir (tmpdir / "link-1");
-+mkdir <cwd:readdir> -> ok
-+mkdir <readdir:test-1> -> ok
-+mkdir <readdir:test-2> -> ok
-+write <readdir:test-1/file> -> ok
-+read_dir <readdir> -> ["test-1"; "test-2"]
-+read_dir <readdir:.> -> ["test-1"; "test-2"]
-+Eio.Io Fs Permission_denied _, reading directory <readdir:..>
-+Eio.Io Fs Not_found _, reading directory <readdir:test-3>
-+read_dir <readdir:link-1> -> ["file"]
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 An error from the underlying directory, not the sandbox:
@@ -645,14 +581,15 @@ An error from the underlying directory, not the sandbox:
 ```ocaml
 # run ~clear:["test-no-access"] @@ fun env ->
   Unix.mkdir "test-no-access" 0;;
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 # run @@ fun env ->
   let cwd = Eio.Stdenv.cwd env in
   try_read_dir (cwd / "test-no-access");;
-+Eio.Io Fs Permission_denied _, reading directory <cwd:test-no-access>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 # Unix.chmod "test-no-access" 0o700;;
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOENT, "chmod", "test-no-access")
 ```
 
 Can use `fs` to access absolute paths:
@@ -666,10 +603,8 @@ Can use `fs` to access absolute paths:
   traceln "Read %S and got %S" Filename.null (Buffer.contents b);
   traceln "Trying with cwd instead fails:";
   Path.with_open_in (cwd / Filename.null) (fun flow -> Eio.Flow.copy flow (Eio.Flow.buffer_sink b));;;
-+Read "/dev/null" and got ""
-+Trying with cwd instead fails:
-Exception: Eio.Io Fs Permission_denied _,
-  opening <cwd:/dev/null>
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Symlinking and sandboxing:
@@ -685,14 +620,8 @@ Symlinking and sandboxing:
   try_symlink ~link_to:"hello.txt" (cwd / "world.txt");
   try_symlink ~link_to:"/" (cwd / "root");
   try_read_dir (cwd / "root");;
-+Eio.Io Fs Permission_denied _, creating symlink <cwd:../world.txt> -> hello.txt
-+Eio.Io Fs Permission_denied _, creating symlink <cwd:/world.txt> -> hello.txt
-+symlink <cwd:world.txt> -> "hello.txt"
-+world.txt -> hello.txt: Hello World!
-+Eio.Io Fs Already_exists _, creating symlink <cwd:world.txt> -> hello.txt
-+symlink <cwd:root> -> "/"
-+Eio.Io Fs Permission_denied _, reading directory <cwd:root>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 ## Streamling lines
@@ -704,10 +633,8 @@ Symlinking and sandboxing:
   Path.with_lines (cwd / "test-data") (fun lines ->
      Seq.iter (traceln "Line: %s") lines
   );;
-+Line: one
-+Line: two
-+Line: three
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Unix interop
@@ -725,8 +652,8 @@ We can get the Unix FD from the flow and use it directly:
         let got = Unix.read fd (Bytes.create 10) 0 10 in
         traceln "Read %d bytes from null device" got
   );;
-+Read 0 bytes from null device
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 We can also remove it from the flow completely and take ownership of it.
@@ -741,8 +668,8 @@ In that case, `with_open_in` will no longer close it on exit:
   let got = Unix.read fd (Bytes.create 10) 0 10 in
   traceln "Read %d bytes from null device" got;
   Unix.close fd;;
-+Read 0 bytes from null device
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Use after close
@@ -753,8 +680,8 @@ In that case, `with_open_in` will no longer close it on exit:
   try
     failwith (Path.read_dir closed |> String.concat ",")
   with Invalid_argument _ -> traceln "Got Invalid_argument for closed FD";;
-+Got Invalid_argument for closed FD
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Rename
@@ -773,35 +700,25 @@ let try_rename t =
   try_rename (t / "../foo") (t / "foo");
   Unix.chdir ".."
 ```
+```mdx-error
+Line 2, characters 5-14:
+Error: Unbound value try_mkdir
+```
 
 Confined:
 
 ```ocaml
 # run ~clear:["tmp"; "dir"; "foo"] @@ fun env -> try_rename env#cwd;;
-+mkdir <cwd:tmp> -> ok
-+rename <cwd:tmp> to <cwd:dir> -> ok
-+write <cwd:foo> -> ok
-+rename <cwd:foo> to <cwd:dir/bar> -> ok
-+read <cwd:dir/bar> -> "FOO"
-+rename <dir:bar> to <cwd:foo> -> ok
-+read <cwd:foo> -> "FOO"
-+Eio.Io Fs Permission_denied _, renaming <cwd:../foo> to <cwd:foo>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Unconfined:
 
 ```ocaml
 # run @@ fun env -> try_rename env#fs;;
-+mkdir <fs:tmp> -> ok
-+rename <fs:tmp> to <fs:dir> -> ok
-+Eio.Io Fs Already_exists _, opening <fs:foo>
-+rename <fs:foo> to <fs:dir/bar> -> ok
-+read <fs:dir/bar> -> "FOO"
-+rename <dir:bar> to <fs:foo> -> ok
-+read <fs:foo> -> "FOO"
-+rename <fs:../foo> to <fs:foo> -> ok
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Stat
@@ -814,9 +731,8 @@ Unconfined:
   assert (Eio.Path.is_directory (cwd / "stat_subdir"));
   try_write_file (cwd / "stat_reg") "kingbula" ~create:(`Exclusive 0o600);
   assert (Eio.Path.is_file (cwd / "stat_reg"));
-+mkdir <cwd:stat_subdir> -> ok
-+write <cwd:stat_reg> -> ok
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Fstatat:
@@ -837,16 +753,8 @@ Unconfined:
   Path.symlink ~link_to:".." (cwd / "parent-symlink");
   try_stat (cwd / "parent-symlink");
   try_stat (cwd / "missing1" / "missing2");
-+mkdir <cwd:stat_subdir2> -> ok
-+<cwd:stat_subdir2> -> directory
-+<cwd:symlink> -> symbolic link / directory
-+<cwd:broken-symlink> -> symbolic link / Fs Not_found _
-+<cwd> -> directory
-+<cwd:..> -> Fs Permission_denied _
-+<cwd:stat_subdir2/..> -> directory
-+<cwd:parent-symlink> -> symbolic link / Fs Permission_denied _
-+<cwd:missing1/missing2> -> Fs Not_found _
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 
@@ -863,12 +771,8 @@ Unconfined:
   try_write_file (cwd / "file") "data" ~create:(`Exclusive 0o600);
   try_read_link (cwd / "file");
   try_read_link (cwd / "../unknown");
-+read_link <cwd:symlink> -> "file"
-+read_link <fs:symlink> -> "file"
-+write <cwd:file> -> ok
-+Eio.Io _, reading target of symlink <cwd:file>
-+Eio.Io Fs Permission_denied _, reading target of symlink <cwd:../unknown>
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # pread/pwrite
@@ -886,8 +790,8 @@ Check reading and writing vectors at arbitrary offsets:
   let buf2 = Cstruct.create 4 in
   Eio.File.pread_exact file ~file_offset:(Int63.of_int 1) [buf1; buf2];
   traceln" %S/%S" (Cstruct.to_string buf1) (Cstruct.to_string buf2);;
-+ "-ab"/"c123"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 Reading at the end of a file:
@@ -906,9 +810,8 @@ Reading at the end of a file:
     assert false
   with End_of_file ->
     traceln "End-of-file";;
-+Read "abc"
-+End-of-file
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Cancelling while readable
@@ -924,7 +827,8 @@ Ensure reads can be cancelled promptly, even if there is no need to wait:
         for _ = 1 to 10 do Eio.Flow.read_exact null buf done;
         assert false)
      (fun () -> failwith "Simulated error");;
-Exception: Failure "Simulated error".
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Native paths
@@ -957,19 +861,8 @@ Exception: Failure "Simulated error".
   test (sub / ".");
   test (sub / "..");
   test (sub / "/etc/passwd");
-+<fs> -> Some .
-+<fs:/> -> Some /
-+<fs:/etc/hosts> -> Some /etc/hosts
-+<fs:.> -> Some .
-+<fs:foo/bar> -> Some ./foo/bar
-+<cwd> -> Some .
-+<cwd:..> -> Some ./..
-+<native-sub> -> Some ./native-sub/
-+<native-sub:foo.txt> -> Some ./native-sub/foo.txt
-+<native-sub:.> -> Some ./native-sub/.
-+<native-sub:..> -> Some ./native-sub/..
-+<native-sub:/etc/passwd> -> Some /etc/passwd
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Seek, truncate and sync
@@ -986,10 +879,8 @@ Exception: Failure "Simulated error".
   let pos = Eio.File.seek file (Int63.of_int (-1)) `End in
   traceln "seek from end: %a" Int63.pp pos;
   Eio.File.sync file;    (* (no way to check if this actually worked, but ensure it runs) *)
-+seek from start: 3
-+relative seek: 5
-+seek from end: 9
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 # Extending paths
@@ -1007,15 +898,8 @@ Exception: Failure "Simulated error".
     "", "bar";
     "/", "";
   ]
-+"foo" / "bar" = "foo/bar"
-+"foo/" / "bar" = "foo/bar"
-+"foo" / "/bar" = "/bar"
-+"foo" / "" = "foo/"
-+"foo/" / "" = "foo/"
-+"" / "" = ""
-+"" / "bar" = "bar"
-+"/" / "" = "/"
-- : unit = ()
+Line 1, characters 1-4:
+Error: Unbound value run
 ```
 
 ```ocaml
@@ -1037,3 +921,7 @@ run ~clear:["stat_subdir2"; "symlink"; "broken-symlink"; "parent-symlink"] @@ fu
   try_stat (cwd / "missing1" / "missing2");
   ();
 ```
+```mdx-error
+Line 1, characters 1-4:
+Error: Unbound value run
+```
"/usr/bin/env" "bash" "-c" "opam exec -- dune build @install @check @runtest && rm -rf _build" failed with exit status 1
2024-10-28 11:35.48: Job failed: Failed: Build failed