2026-03-23 09:27.07: New job: test ocaml-multicore/lwt_eio https://github.com/ocaml-multicore/lwt_eio.git#refs/heads/master (e3679c5296dd0aacac825735dab45ded26d55821) (linux-x86_64:debian-12-5.4_opam-2.5)Base: ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0Opam project buildTo reproduce locally:git clone --recursive "https://github.com/ocaml-multicore/lwt_eio.git" -b "master" && cd "lwt_eio" && git reset --hard e3679c52cat > Dockerfile <<'END-OF-DOCKERFILE'FROM ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0# debian-12-5.4_opam-2.5USER 1000:1000ENV CLICOLOR_FORCE="1"ENV OPAMCOLOR="always"WORKDIR /srcRUN sudo ln -f /usr/bin/opam-2.5 /usr/bin/opamRUN opam init --reinit -niRUN uname -rs && opam exec -- ocaml -version && opam --versionWORKDIR /srcRUN sudo chown opam /srcRUN cd ~/opam-repository && (git cat-file -e b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -uCOPY --chown=1000:1000 lwt_eio.opam ./RUN opam pin add -yn lwt_eio.dev './'RUN echo '(lang dune 3.0)' > './dune-project'ENV DEPS="astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0"ENV CI="true"ENV OCAMLCI="true"RUN opam update --depexts && opam install --cli=2.5 --depext-only -y lwt_eio.dev $DEPSRUN opam install $DEPSCOPY --chown=1000:1000 . /srcRUN opam exec -- dune build @install @check @runtest && rm -rf _buildEND-OF-DOCKERFILEdocker build .END-REPRO-BLOCK2026-03-23 09:27.07: Using cache hint "ocaml-multicore/lwt_eio-ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0-debian-12-5.4_opam-2.5-e8c1b20f09074fcd962a3f10a4b561f6"2026-03-23 09:27.07: Using OBuilder spec:((from ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0)(comment debian-12-5.4_opam-2.5)(user (uid 1000) (gid 1000))(env CLICOLOR_FORCE 1)(env OPAMCOLOR always)(workdir /src)(run (shell "sudo ln -f /usr/bin/opam-2.5 /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 b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -u"))(copy (src lwt_eio.opam) (dst ./))(run (network host)(shell "opam pin add -yn lwt_eio.dev './'"))(run (shell "echo '(lang dune 3.0)' > './dune-project'"))(env DEPS "astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0")(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=2.5 --depext-only -y lwt_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")))2026-03-23 09:27.07: Waiting for resource in pool OCluster2026-03-23 11:09.48: Waiting for worker…2026-03-23 11:14.37: Got resource from pool OClusterBuilding on doris.caelum.ci.devAll commits already cachedHEAD is now at e3679c5 Merge pull request #30 from talex5/examples(from ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0)Unable to find image 'ocaml/opam:debian-12-ocaml-5.4@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0' locallydocker.io/ocaml/opam@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0: Pulling from ocaml/opam6a7e0620566c: Pulling fs layerb522231f5ab2: Pulling fs layerafdd14ae9c19: Pulling fs layer66581c681bfe: Pulling fs layerf18cc03cd0ee: Pulling fs layer41c93f1246a4: Pulling fs layercb520e352cb7: Pulling fs layer6f571f52b1e6: Pulling fs layer66581c681bfe: Waitingf18cc03cd0ee: 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complete5ffee695b471: Pull complete3b29523a83c0: Pull completebc29cdc25fce: Pull complete79ba50761f79: Verifying Checksum79ba50761f79: Download complete8517110ac83a: Pull complete356db949e025: Pull complete7ee9ee162427: Pull complete6a1d95c3a3f6: Pull completeaa806464ecd0: Pull completeca07ebc861f4: Pull complete3d4e2e60226d: Pull complete621f9c37fe3e: Pull complete80f6aee41e34: Pull complete7bf2c961d78c: Pull complete4f4fb700ef54: Pull complete081023aaa233: Pull completefa4e249287fb: Pull complete539ac86e1895: Pull complete62bae98a9155: Pull completebbc39c3da0a4: Pull complete3e77f4c85839: Pull completed02277f66f28: Pull complete69a471cde21c: Pull complete27c12ec76477: Pull complete9f5e4eb06bdd: Pull complete9aca8ffce92a: Pull complete3744dc3a5b9f: Pull complete79ba50761f79: Pull complete5217711b3bf2: Pull complete4d0f5bd33ce0: Pull complete46cc27a07d86: Pull complete3d6f442e79e1: Pull completeb6ed2a17d09c: Pull complete6f80b3d4534b: Pull complete5ae7b47c44fc: Pull completec96560c51a6e: Pull completea853aa4dc271: Pull complete10faad6dbbc3: Pull complete2dba4a2dda8d: Pull completebebb75619b5a: Pull completeDigest: sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc0Status: Downloaded newer image for ocaml/opam@sha256:887261dc4317b38fc7d7c14b181577ebcc527451ee68f7570cce454346262dc02026-03-23 11:14.37 ---> using "b991857bc532663195c9367a15b54da445df086396345870aae181468cbff451" from cache/: (comment debian-12-5.4_opam-2.5)/: (user (uid 1000) (gid 1000))/: (env CLICOLOR_FORCE 1)/: (env OPAMCOLOR always)/: (workdir /src)/src: (run (shell "sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam"))2026-03-23 11:14.37 ---> using "51e82d412b033001f8730ad5679c094b4d67a0b7d2cf15f3d8f508bbc845624a" 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 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[NOTE] The 'jobs' option was reset, its value was 71 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=71 --globalFormat upgrade done.<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>[default] Initialised2026-03-23 11:14.37 ---> using "84920d434004718251217bc1eeca5eedc7bfcb6fa9b10af1ca40da535b88191c" from cache/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))Linux 6.8.0-106-genericThe OCaml toplevel, version 5.4.02.5.02026-03-23 11:14.37 ---> using "a36f2c1b469bba0b8709ee1441c088962b00943019584bf6342f3b26b8210c85" from cache/src: (workdir /src)/src: (run (shell "sudo chown opam /src"))2026-03-23 11:14.37 ---> using "ee01ba31a0c57849c0a41065165ddcba944c6a19882473f481b28bbc0add4763" from cache/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))(network host)(shell "cd ~/opam-repository && (git cat-file -e b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -u"))From https://github.com/ocaml/opam-repository* branch master -> FETCH_HEAD4f056bfedf..63b7ba71be master -> origin/masterb479391466 Merge pull request #29567 from mtelvers/opam-publish-ocaml-version.4.0.4<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>[default] synchronised from git+file:///home/opam/opam-repositoryEverything as up-to-date as possible (run with --verbose to show unavailable upgrades).However, you may "opam upgrade" these packages explicitly at these versions (e.g. "opam upgrade ocaml.5.5.0"), which will ask permission to downgrade or uninstall the conflicting packages.Nothing to do.# To update the current shell environment, run: eval $(opam env)2026-03-23 11:14.37 ---> using "5798e16477bc67affde456375fcd773fb7a008c63329933e286f4d9d55988bf9" from cache/src: (copy (src lwt_eio.opam) (dst ./))2026-03-23 11:14.37 ---> saved as "665ae6378e4f9ed1bfa689b1a0f6d196b19a7cf554938f6a58a7ac6cc5b3641d"/src: (run (network host)(shell "opam pin add -yn lwt_eio.dev './'"))[lwt_eio.dev] synchronised (file:///src)lwt_eio is now pinned to file:///src (version dev)2026-03-23 11:14.38 ---> saved as "c813674a51a2450fdbd3bd7a867cb3216f81ca453229167579d4891cc16cf338"/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))2026-03-23 11:14.38 ---> saved as "299448dc99d51f2d073e513bf4fbe7b5af265f54cf84b562f7ee241748999d3a"/src: (env DEPS "astring.0.8.5 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0")/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=2.5 --depext-only -y lwt_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 [294 kB]- Fetched 397 kB in 1s (454 kB/s)- Reading package lists...-<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>[lwt_eio.dev] synchronised (file:///src)[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-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml is already installed (current version is 5.4.0).[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-effects 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).# To update the current shell environment, run: eval $(opam env)2026-03-23 11:14.48 ---> saved as "4dd15622542c6cfcb3c1a3559c6e473d83665d323c159d194ac75d981a2d945f"/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-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml is already installed (current version is 5.4.0).[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-effects 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 35 packages- install astring 0.8.5- install base-bytes base- install bigstringaf 0.10.0- install camlp-streams 5.0.1- install cmdliner 2.1.0- install cppo 1.8.0- install csexp 1.5.2- install cstruct 6.2.0- install domain-local-await 1.0.1- install dune 3.22.0- install dune-configurator 3.22.0- install eio 1.3- install eio_linux 1.3- install eio_main 1.3- install eio_posix 1.3- install fmt 0.11.0- install hmap 0.8.1- install iomux 0.4- install logs 0.10.0- install lwt 6.1.1- install lwt-dllist 1.1.0- install mdx 2.5.1- install mtime 2.1.0- install ocaml-version 4.0.4- install ocamlbuild 0.16.1- install ocamlfind 1.9.8- install ocplib-endian 1.2- install optint 0.3.0- install psq 0.2.1- install re 1.14.0- install result 1.5- install seq base- install thread-table 1.0.0- install topkg 1.1.1- install uring 2.7.0<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>-> retrieved astring.0.8.5 (cached)-> retrieved bigstringaf.0.10.0 (cached)-> retrieved camlp-streams.5.0.1 (cached)-> retrieved cppo.1.8.0 (cached)-> retrieved csexp.1.5.2 (cached)-> retrieved cmdliner.2.1.0 (cached)-> retrieved cstruct.6.2.0 (cached)-> retrieved domain-local-await.1.0.1 (cached)-> retrieved fmt.0.11.0 (cached)-> retrieved hmap.0.8.1 (cached)-> retrieved iomux.0.4 (cached)-> retrieved logs.0.10.0 (cached)-> retrieved eio.1.3, eio_linux.1.3, eio_main.1.3, eio_posix.1.3 (cached)-> retrieved lwt.6.1.1 (cached)-> retrieved lwt-dllist.1.1.0 (cached)-> retrieved mtime.2.1.0 (cached)-> retrieved ocaml-version.4.0.4 (cached)-> retrieved mdx.2.5.1 (cached)-> retrieved ocamlbuild.0.16.1 (cached)-> retrieved ocamlfind.1.9.8 (cached)-> retrieved dune.3.22.0, dune-configurator.3.22.0 (cached)-> retrieved ocplib-endian.1.2 (cached)-> retrieved optint.0.3.0 (cached)-> retrieved psq.0.2.1 (cached)-> retrieved seq.base (cached)-> retrieved re.1.14.0 (cached)-> retrieved result.1.5 (cached)-> retrieved thread-table.1.0.0 (cached)-> retrieved topkg.1.1.1 (cached)-> retrieved uring.2.7.0 (cached)-> installed cmdliner.2.1.0-> installed seq.base-> installed ocamlfind.1.9.8-> installed base-bytes.base-> installed ocamlbuild.0.16.1-> installed topkg.1.1.1-> installed hmap.0.8.1-> installed mtime.2.1.0-> installed fmt.0.11.0-> installed astring.0.8.5-> installed dune.3.22.0-> installed lwt-dllist.1.1.0-> installed csexp.1.5.2-> installed camlp-streams.5.0.1-> installed cppo.1.8.0-> installed cstruct.6.2.0-> installed ocaml-version.4.0.4-> installed optint.0.3.0-> installed psq.0.2.1-> installed re.1.14.0-> installed result.1.5-> installed thread-table.1.0.0-> installed ocplib-endian.1.2-> installed domain-local-await.1.0.1-> installed dune-configurator.3.22.0-> installed bigstringaf.0.10.0-> installed iomux.0.4-> installed eio.1.3-> installed uring.2.7.0-> installed lwt.6.1.1-> installed eio_linux.1.3-> installed eio_posix.1.3-> installed eio_main.1.3-> installed logs.0.10.0-> installed mdx.2.5.1Done.# To update the current shell environment, run: eval $(opam env)2026-03-23 11:15.33 ---> saved as "3856a8ae4fb1af091dd69823e0d4a54100bc846454533b01e95f2f1d11a63aa1"/src: (copy (src .) (dst /src))2026-03-23 11:15.33 ---> saved as "f7a426eed76e4724144948c5b35016b45277cb3fe4fe058cd8367c19ad2e45b8"/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))(cd _build/default && /home/opam/.opam/5.4/bin/ocamlc.opt -w @1..3@5..28@30..39@43@46..47@49..57@61..62@67@69-40 -strict-sequence -strict-formats -short-paths -keep-locs -g -bin-annot -bin-annot-occurrences -I lib/.lwt_eio.objs/byte -I /home/opam/.opam/5.4/lib/bigstringaf -I /home/opam/.opam/5.4/lib/bytes -I /home/opam/.opam/5.4/lib/cstruct -I /home/opam/.opam/5.4/lib/domain-local-await -I /home/opam/.opam/5.4/lib/eio -I /home/opam/.opam/5.4/lib/eio/core -I /home/opam/.opam/5.4/lib/eio/runtime_events -I /home/opam/.opam/5.4/lib/eio/unix -I /home/opam/.opam/5.4/lib/eio/utils -I /home/opam/.opam/5.4/lib/fmt -I /home/opam/.opam/5.4/lib/hmap -I /home/opam/.opam/5.4/lib/lwt -I /home/opam/.opam/5.4/lib/lwt-dllist -I /home/opam/.opam/5.4/lib/lwt/unix -I /home/opam/.opam/5.4/lib/mtime -I /home/opam/.opam/5.4/lib/mtime/clock -I /home/opam/.opam/5.4/lib/ocaml/runtime_events -I /home/opam/.opam/5.4/lib/ocaml/threads -I /home/opam/.opam/5.4/lib/ocaml/unix -I /home/opam/.opam/5.4/lib/ocplib-endian -I /home/opam/.opam/5.4/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.4/lib/optint -I /home/opam/.opam/5.4/lib/psq -I /home/opam/.opam/5.4/lib/seq -I /home/opam/.opam/5.4/lib/thread-table -cmi-file lib/.lwt_eio.objs/byte/lwt_eio.cmi -no-alias-deps -opaque -o lib/.lwt_eio.objs/byte/lwt_eio.cmo -c -impl lib/lwt_eio.ml)File "lib/lwt_eio.ml", lines 126-174, characters 29-3:126 | .............................object127 | inherit Lwt_engine.abstract128 |129 | method private cleanup =130 | try Switch.fail sw Exit...171 |172 | method! fork =173 | is_forked := true174 | endError: This object has virtual methods.The following methods are virtual : id(cd _build/default && /home/opam/.opam/5.4/bin/ocamlopt.opt -w @1..3@5..28@30..39@43@46..47@49..57@61..62@67@69-40 -strict-sequence -strict-formats -short-paths -keep-locs -g -I lib/.lwt_eio.objs/byte -I lib/.lwt_eio.objs/native -I /home/opam/.opam/5.4/lib/bigstringaf -I /home/opam/.opam/5.4/lib/bytes -I /home/opam/.opam/5.4/lib/cstruct -I /home/opam/.opam/5.4/lib/domain-local-await -I /home/opam/.opam/5.4/lib/eio -I /home/opam/.opam/5.4/lib/eio/core -I /home/opam/.opam/5.4/lib/eio/runtime_events -I /home/opam/.opam/5.4/lib/eio/unix -I /home/opam/.opam/5.4/lib/eio/utils -I /home/opam/.opam/5.4/lib/fmt -I /home/opam/.opam/5.4/lib/hmap -I /home/opam/.opam/5.4/lib/lwt -I /home/opam/.opam/5.4/lib/lwt-dllist -I /home/opam/.opam/5.4/lib/lwt/unix -I /home/opam/.opam/5.4/lib/mtime -I /home/opam/.opam/5.4/lib/mtime/clock -I /home/opam/.opam/5.4/lib/ocaml/runtime_events -I /home/opam/.opam/5.4/lib/ocaml/threads -I /home/opam/.opam/5.4/lib/ocaml/unix -I /home/opam/.opam/5.4/lib/ocplib-endian -I /home/opam/.opam/5.4/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.4/lib/optint -I /home/opam/.opam/5.4/lib/psq -I /home/opam/.opam/5.4/lib/seq -I /home/opam/.opam/5.4/lib/thread-table -cmi-file lib/.lwt_eio.objs/byte/lwt_eio.cmi -no-alias-deps -opaque -o lib/.lwt_eio.objs/native/lwt_eio.cmx -c -impl lib/lwt_eio.ml)File "lib/lwt_eio.ml", lines 126-174, characters 29-3:126 | .............................object127 | inherit Lwt_engine.abstract128 |129 | method private cleanup =130 | try Switch.fail sw Exit...171 |172 | method! fork =173 | is_forked := true174 | endError: This object has virtual methods.The following methods are virtual : id"/usr/bin/env" "bash" "-c" "opam exec -- dune build @install @check @runtest && rm -rf _build" failed with exit status 12026-03-23 11:15.37: Job failed: Failed: Build failed