macos-homebrew-5.2_arm64_opam-2.2

2024-10-31 09:35.57: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/772/head (a657c607c359c8e820deaa2b61b9990cd847dad1) (macos-arm64:macos-homebrew-5.2_arm64_opam-2.2)
Base: macos-homebrew-ocaml-5.2
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 a657c607
cat > Dockerfile <<'END-OF-DOCKERFILE'
FROM macos-homebrew-ocaml-5.2
# macos-homebrew-5.2_arm64_opam-2.2
USER 1000:1000
ENV CLICOLOR_FORCE="1"
ENV OPAMCOLOR="always"
RUN ln -f ~/local/bin/opam-2.2 ~/local/bin/opam
RUN opam init --reinit -ni
RUN uname -rs && opam exec -- ocaml -version && opam --version
RUN cd ~/opam-repository && (git cat-file -e b876d7d37014df697368765c088aa86d24dc8b6b || git fetch origin master) && git reset -q --hard b876d7d37014df697368765c088aa86d24dc8b6b && 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 ./src/./
RUN opam pin add -yn eio_windows.dev './src/./' && \
    opam pin add -yn eio_posix.dev './src/./' && \
    opam pin add -yn eio_main.dev './src/./' && \
    opam pin add -yn eio_linux.dev './src/./' && \
    opam pin add -yn eio.dev './src/./'
ENV DEPS="afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.1.3.0 containers.3.14 cppo.1.7.0 crowbar.0.2.1 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 domain-local-timeout.1.0.1 dscheck.0.5.0 dune.3.16.0 dune-configurator.3.16.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-arm64.1 host-system-other.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.4.1 mtime.2.1.0 multicore-magic.2.3.0 ocaml.5.2.0 ocaml-base-compiler.5.2.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.6.9 ocamlbuild.0.15.0 ocamlfind.1.9.6 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2"
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.dev $DEPS
RUN opam install $DEPS
COPY --chown=1000:1000 . ./src
RUN cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build

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

2024-10-31 09:35.57: Using cache hint "ocaml-multicore/eio-macos-homebrew-ocaml-5.2-macos-homebrew-5.2_arm64_opam-2.2-ce5fd1080cd1f32697f312bf347c3e28"
2024-10-31 09:35.57: Using OBuilder spec:
((from macos-homebrew-ocaml-5.2)
 (comment macos-homebrew-5.2_arm64_opam-2.2)
 (user (uid 1000) (gid 1000))
 (env CLICOLOR_FORCE 1)
 (env OPAMCOLOR always)
 (run (shell "ln -f ~/local/bin/opam-2.2 ~/local/bin/opam"))
 (run (shell "opam init --reinit -ni"))
 (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "cd ~/opam-repository && (git cat-file -e b876d7d37014df697368765c088aa86d24dc8b6b || git fetch origin master) && git reset -q --hard b876d7d37014df697368765c088aa86d24dc8b6b && 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 ./src/./))
 (run (network host)
      (shell  "opam pin add -yn eio_windows.dev './src/./' && \
             \nopam pin add -yn eio_posix.dev './src/./' && \
             \nopam pin add -yn eio_main.dev './src/./' && \
             \nopam pin add -yn eio_linux.dev './src/./' && \
             \nopam pin add -yn eio.dev './src/./'"))
 (env DEPS "afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.1.3.0 containers.3.14 cppo.1.7.0 crowbar.0.2.1 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 domain-local-timeout.1.0.1 dscheck.0.5.0 dune.3.16.0 dune-configurator.3.16.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-arm64.1 host-system-other.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.4.1 mtime.2.1.0 multicore-magic.2.3.0 ocaml.5.2.0 ocaml-base-compiler.5.2.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.6.9 ocamlbuild.0.15.0 ocamlfind.1.9.6 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2")
 (env CI true)
 (env OCAMLCI true)
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "opam update --depexts && opam install --cli=2.2 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS"))
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "opam install $DEPS"))
 (copy (src .) (dst ./src))
 (run (shell "cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build"))
)

2024-10-31 09:35.57: Waiting for resource in pool OCluster
2024-10-31 09:35.57: Waiting for worker…
2024-10-31 09:35.57: Got resource from pool OCluster
Building on m1-worker-02
HEAD is now at 7562fcb Update fs.md
HEAD is now at a657c60 trying to remove some bugs from the tests

(from macos-homebrew-ocaml-5.2)
2024-10-31 09:35.58 ---> using "9b46fe3d2429f2b9195a02468cb57ac45cfa11fb4a87cb32b5e5375232223327" from cache

/: (comment macos-homebrew-5.2_arm64_opam-2.2)

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

/: (env CLICOLOR_FORCE 1)

/: (env OPAMCOLOR always)

/: (run (shell "ln -f ~/local/bin/opam-2.2 ~/local/bin/opam"))
2024-10-31 09:35.59 ---> using "b003627c18f5d873361872ecfa38a9a8b5c86cc26245bef1d152887064c98071" from cache

/: (run (shell "opam init --reinit -ni"))
No configuration file found, using 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 /Users/mac1000/.opam from version 2.1 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [y/n] y
[NOTE] The 'jobs' option was reset, its value was 1 and its new value will vary according to the current number of cores on your machine. You can restore the fixed value using:
           opam option jobs=1 --global
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] no changes from git+file:///Users/mac1000/opam-repository
2024-10-31 09:35.59 ---> using "408d2cc158c17e89759cf51b146539f00642e287086d5c54f85c33dae9e6a1f9" from cache

/: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
Darwin 23.4.0
The OCaml toplevel, version 5.2.0
2.2.1
2024-10-31 09:35.59 ---> using "80c5626e56c363c9237b2d67b74b9ac64751c52cd041543c0fda73b45b911c9a" from cache

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (network host)
        (shell "cd ~/opam-repository && (git cat-file -e b876d7d37014df697368765c088aa86d24dc8b6b || git fetch origin master) && git reset -q --hard b876d7d37014df697368765c088aa86d24dc8b6b && git log --no-decorate -n1 --oneline && opam update -u"))
From https://github.com/ocaml/opam-repository
 * branch                  master     -> FETCH_HEAD
   5e7a27da27..ba44ffed3b  master     -> origin/master
b876d7d370 Merge pull request #26641 from polytypic/release-backoff-0.1.1

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from git+file:///Users/mac1000/opam-repository

Everything as up-to-date as possible (run with --verbose to show unavailable upgrades).

The following packages are not being upgraded because the new versions conflict with other installed packages:
  - ocaml.5.4.0
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
2024-10-31 09:35.59 ---> using "98bc6638e16fe9ec96dc30070dd9cbcf40247b38f42b88985b91e30f437171fd" from cache

/: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
         (dst ./src/./))
2024-10-31 09:35.59 ---> using "384eee635680942eaaecd77c8eb042ab490a7ee6429b1dcab54d63574d737184" from cache

/: (run (network host)
        (shell  "opam pin add -yn eio_windows.dev './src/./' && \
               \nopam pin add -yn eio_posix.dev './src/./' && \
               \nopam pin add -yn eio_main.dev './src/./' && \
               \nopam pin add -yn eio_linux.dev './src/./' && \
               \nopam pin add -yn eio.dev './src/./'"))
[eio_windows.dev] synchronised (file:///Users/mac1000/src)
eio_windows is now pinned to file:///Users/mac1000/src (version dev)
[eio_posix.dev] synchronised (file:///Users/mac1000/src)
eio_posix is now pinned to file:///Users/mac1000/src (version dev)
[eio_main.dev] synchronised (file:///Users/mac1000/src)
eio_main is now pinned to file:///Users/mac1000/src (version dev)
[eio_linux.dev] synchronised (file:///Users/mac1000/src)
eio_linux is now pinned to file:///Users/mac1000/src (version dev)
[eio.dev] synchronised (file:///Users/mac1000/src)
eio is now pinned to file:///Users/mac1000/src (version dev)
2024-10-31 09:35.59 ---> using "03ad5d083ccd8377d068777415668878abfaa7dbdaba1285a12725b8182c8f00" from cache

/: (env DEPS "afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.base base-domains.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.1.3.0 containers.3.14 cppo.1.7.0 crowbar.0.2.1 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 domain-local-timeout.1.0.1 dscheck.0.5.0 dune.3.16.0 dune-configurator.3.16.0 either.1.0.0 fmt.0.9.0 hmap.0.8.1 host-arch-arm64.1 host-system-other.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.4.1 mtime.2.1.0 multicore-magic.2.3.0 ocaml.5.2.0 ocaml-base-compiler.5.2.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.6.9 ocamlbuild.0.15.0 ocamlfind.1.9.6 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2")

/: (env CI true)

/: (env OCAMLCI true)

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (network host)
        (shell "opam update --depexts && opam install --cli=2.2 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS"))
+ /opt/homebrew/bin/brew "update"
- ==> Updating Homebrew...
- Already up-to-date.

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[eio_main.dev] synchronised (no changes)
[eio_posix.dev] synchronised (no changes)
[eio.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 5.2.0).
[NOTE] Package ocaml is already installed (current version is 5.2.0).
[NOTE] Package host-system-other is already installed (current version is 1).
[NOTE] Package host-arch-arm64 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).
2024-10-31 09:35.59 ---> using "85988b43d35104cbfcffaf6bca04b3a6cbbe5aa0fa312a39a06de9d952361e8d" from cache

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (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 5.2.0).
[NOTE] Package ocaml is already installed (current version is 5.2.0).
[NOTE] Package host-system-other is already installed (current version is 1).
[NOTE] Package host-arch-arm64 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 45 packages
  - install afl-persistent       1.4
  - install alcotest             1.8.0
  - install astring              0.8.5
  - install backoff              0.1.1
  - install base-bytes           base
  - install bigstringaf          0.10.0
  - install camlp-streams        5.0.1
  - install cmdliner             1.3.0
  - install containers           3.14
  - install cppo                 1.7.0
  - install crowbar              0.2.1
  - install csexp                1.5.2
  - install cstruct              6.2.0
  - install domain-local-await   1.0.1
  - install domain-local-timeout 1.0.1
  - install dscheck              0.5.0
  - install dune                 3.16.0
  - install dune-configurator    3.16.0
  - install either               1.0.0
  - install fmt                  0.9.0
  - install hmap                 0.8.1
  - install iomux                0.3
  - install kcas                 0.7.0
  - install logs                 0.7.0
  - install lwt-dllist           1.0.1
  - install mdx                  2.4.1
  - install mtime                2.1.0
  - install multicore-magic      2.3.0
  - install ocaml-syntax-shims   1.0.0
  - install ocaml-version        3.6.9
  - install ocamlbuild           0.15.0
  - install ocamlfind            1.9.6
  - install ocplib-endian        1.2
  - install optint               0.3.0
  - install oseq                 0.5.1
  - install psq                  0.2.1
  - install re                   1.12.0
  - install result               1.5
  - install seq                  base
  - install stdlib-shims         0.3.0
  - install thread-table         1.0.0
  - install topkg                1.0.7
  - install tsort                2.1.0
  - install uutf                 1.0.3
  - install yojson               2.2.2

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved afl-persistent.1.4  (cached)
-> retrieved astring.0.8.5  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved backoff.0.1.1  (cached)
-> retrieved camlp-streams.5.0.1  (cached)
-> retrieved alcotest.1.8.0  (cached)
-> retrieved containers.3.14  (cached)
-> retrieved cppo.1.7.0  (cached)
-> retrieved crowbar.0.2.1  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved cmdliner.1.3.0  (cached)
-> retrieved domain-local-timeout.1.0.1  (cached)
-> retrieved domain-local-await.1.0.1  (cached)
-> retrieved dscheck.0.5.0  (cached)
-> retrieved cstruct.6.2.0  (cached)
-> retrieved either.1.0.0  (cached)
-> retrieved fmt.0.9.0  (cached)
-> retrieved hmap.0.8.1  (cached)
-> retrieved iomux.0.3  (cached)
-> retrieved logs.0.7.0  (cached)
-> retrieved kcas.0.7.0  (cached)
-> retrieved lwt-dllist.1.0.1  (cached)
-> retrieved mtime.2.1.0  (cached)
-> retrieved multicore-magic.2.3.0  (cached)
-> retrieved mdx.2.4.1  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml-version.3.6.9  (cached)
-> retrieved ocamlbuild.0.15.0  (cached)
-> retrieved ocplib-endian.1.2  (cached)
-> retrieved ocamlfind.1.9.6  (cached)
-> retrieved oseq.0.5.1  (cached)
-> retrieved psq.0.2.1  (cached)
-> retrieved optint.0.3.0  (cached)
-> retrieved result.1.5  (cached)
-> retrieved seq.base  (cached)
-> installed seq.base
-> retrieved re.1.12.0  (cached)
-> retrieved stdlib-shims.0.3.0  (cached)
-> retrieved thread-table.1.0.0  (cached)
-> retrieved tsort.2.1.0  (cached)
-> retrieved uutf.1.0.3  (cached)
-> retrieved topkg.1.0.7  (cached)
-> retrieved yojson.2.2.2  (cached)
-> retrieved dune.3.16.0, dune-configurator.3.16.0  (cached)
-> installed cmdliner.1.3.0
-> installed ocamlbuild.0.15.0
-> installed ocamlfind.1.9.6
-> installed base-bytes.base
-> installed topkg.1.0.7
-> installed hmap.0.8.1
-> installed uutf.1.0.3
-> installed mtime.2.1.0
-> installed fmt.0.9.0
-> installed astring.0.8.5
-> installed logs.0.7.0
-> installed dune.3.16.0
-> installed backoff.0.1.1
-> installed csexp.1.5.2
-> installed afl-persistent.1.4
-> installed multicore-magic.2.3.0
-> installed lwt-dllist.1.0.1
-> installed either.1.0.0
-> installed cstruct.6.2.0
-> installed cppo.1.7.0
-> installed camlp-streams.5.0.1
-> installed psq.0.2.1
-> installed optint.0.3.0
-> installed ocaml-version.3.6.9
-> installed ocplib-endian.1.2
-> installed oseq.0.5.1
-> installed stdlib-shims.0.3.0
-> installed result.1.5
-> installed thread-table.1.0.0
-> installed ocaml-syntax-shims.1.0.0
-> installed tsort.2.1.0
-> installed crowbar.0.2.1
-> installed domain-local-await.1.0.1
-> installed domain-local-timeout.1.0.1
-> installed dune-configurator.3.16.0
-> installed re.1.12.0
-> installed bigstringaf.0.10.0
-> installed kcas.0.7.0
-> installed yojson.2.2.2
-> installed iomux.0.3
-> installed alcotest.1.8.0
-> installed containers.3.14
-> installed mdx.2.4.1
-> installed dscheck.0.5.0
Done.

<><> afl-persistent.1.4 installed successfully ><><><><><><><><><><><><><><><><>
=> afl-persistent is installed, but since the current OCaml compiler does
   not enable AFL instrumentation by default, most packages will not be
   instrumented and fuzzing with afl-fuzz may not be effective.

   To globally enable AFL instrumentation, create an OCaml switch like:

     opam switch create 5.2.0+afl ocaml-variants.5.2.0+options ocaml-option-afl
# Run eval $(opam env) to update the current shell environment
2024-10-31 09:35.59 ---> using "9bf80988d49ac5b064b48723118c74fff0bda9cb83a03c298b1949dc9ac74e4c" from cache

/: (copy (src .) (dst ./src))
2024-10-31 09:36.00 ---> saved as "5a2d0d521fc19707305653414dce5060e387698fed71b5abfd3d16d5fd2486c4"

/: (run (shell "cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build"))
(cd _build/default/fuzz && ./fuzz_buf_read.exe)
random ops: PASS

(cd _build/default/fuzz && ./fuzz_inherit_fds.exe)
inherit_fds: PASS

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

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 9013a6f..10c6faa 100644
--- a/_build/default/tests/fs.md
+++ b/_build/default/tests/.mdx/fs.md.corrected
@@ -97,6 +97,10 @@ let try_symlink ~link_to path =
 
 let try_chmod 
 
+```
+```mdx-error
+Line 91, characters 1-3:
+Error: Syntax error
 ```
 
 # Basic test cases
@@ -108,16 +112,15 @@ 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
@@ -129,8 +132,8 @@ 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:
@@ -140,8 +143,8 @@ 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
@@ -154,8 +157,8 @@ 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:
@@ -167,8 +170,8 @@ 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:
@@ -180,10 +183,10 @@ 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:
@@ -194,8 +197,8 @@ 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:
@@ -207,10 +210,10 @@ 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
@@ -222,13 +225,12 @@ 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:
@@ -246,13 +248,8 @@ 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
@@ -261,40 +258,55 @@ 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
@@ -313,12 +325,8 @@ 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`.
@@ -332,11 +340,8 @@ 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
@@ -360,16 +365,8 @@ 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:
@@ -382,11 +379,8 @@ 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:
@@ -426,22 +420,8 @@ 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
@@ -463,18 +443,8 @@ 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:
@@ -487,11 +457,8 @@ 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
@@ -509,14 +476,8 @@ 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
@@ -532,10 +493,8 @@ 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
@@ -565,17 +524,8 @@ 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 = ()
@@ -600,14 +550,8 @@ 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`.
@@ -626,16 +570,8 @@ 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:
@@ -643,14 +579,15 @@ 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:
@@ -664,10 +601,8 @@ 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:
@@ -683,14 +618,8 @@ 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
@@ -702,10 +631,8 @@ 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
@@ -723,8 +650,8 @@ 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.
@@ -739,8 +666,8 @@ 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
@@ -751,8 +678,8 @@ 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
@@ -771,35 +698,25 @@ 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
@@ -812,9 +729,8 @@ 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:
@@ -835,16 +751,8 @@ 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
 ```
 
 
@@ -861,12 +769,8 @@ 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
@@ -884,8 +788,8 @@ 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:
@@ -904,9 +808,8 @@ 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
@@ -922,7 +825,8 @@ 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
@@ -955,19 +859,8 @@ 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
@@ -984,10 +877,8 @@ 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
@@ -1005,15 +896,8 @@ 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
"/usr/bin/env" "bash" "-c" "cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build" failed with exit status 1
2024-10-31 09:36.10: Job failed: Failed: Build failed