[INFO] cloning repository https://github.com/danielpclark/bench_ruby_ffi_example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danielpclark/bench_ruby_ffi_example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2f8fae8311f8d69695d428e538201c98ba2c67c2
[INFO] testing danielpclark/bench_ruby_ffi_example against master#b70888601af92f6cdc0364abab3446e418b91d36 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielpclark/bench_ruby_ffi_example on toolchain b70888601af92f6cdc0364abab3446e418b91d36
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/danielpclark/bench_ruby_ffi_example
[INFO] finished tweaking git repo https://github.com/danielpclark/bench_ruby_ffi_example
[INFO] tweaked toml for git repo https://github.com/danielpclark/bench_ruby_ffi_example written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/danielpclark/bench_ruby_ffi_example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4f1c26f8cbb43648eed947a029384dd0aa0521a7d9d7110897c5021ac5d32ddb
[INFO] running `Command { std: "docker" "start" "-a" "4f1c26f8cbb43648eed947a029384dd0aa0521a7d9d7110897c5021ac5d32ddb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4f1c26f8cbb43648eed947a029384dd0aa0521a7d9d7110897c5021ac5d32ddb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f1c26f8cbb43648eed947a029384dd0aa0521a7d9d7110897c5021ac5d32ddb", kill_on_drop: false }`
[INFO] [stdout] 4f1c26f8cbb43648eed947a029384dd0aa0521a7d9d7110897c5021ac5d32ddb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8da033c3ddd24ae3693227ab6b0b202bc483f84ef342b1b1e891cc3d4e54183c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8da033c3ddd24ae3693227ab6b0b202bc483f84ef342b1b1e891cc3d4e54183c", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruby-sys v0.2.20
[INFO] [stderr]    Compiling array_tool v0.4.1
[INFO] [stderr]    Compiling ruru v0.9.3
[INFO] [stderr]    Compiling ffi_example v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self::array_tool::string::Squeeze`
[INFO] [stdout]   --> src/lib.rs:11:7
[INFO] [stdout]    |
[INFO] [stdout] 11 |   use self::array_tool::string::Squeeze;
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `RuruExample`, which is not FFI-safe
[INFO] [stdout]   --> src/lib.rs:95:3
[INFO] [stdout]    |
[INFO] [stdout] 95 |   RuruExample,
[INFO] [stdout]    |   ^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout]    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]    = note: this struct has unspecified layout
[INFO] [stdout] note: the type is defined here
[INFO] [stdout]   --> src/lib.rs:92:1
[INFO] [stdout]    |
[INFO] [stdout] 92 | class!(RuruExample);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: this warning originates in the macro `class` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--version-script=/tmp/rustcVDRmq0/list" "-m64" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.c86959da-cgu.9.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.3rfh0m6l5mqx7mif.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.23bqdprwrrb8httn.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/usr/lib" "-L" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/opt/rustwide/target/debug/deps/libarray_tool-568f6283d1dd5262.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/target/debug/deps/libruru-da246916a066b753.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/target/debug/deps/libruby_sys-6391f46666399a85.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/target/debug/deps/liblibc-1339fb7ff3224088.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/target/debug/deps/liblazy_static-7c2a983e4e14fd6a.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-9c44f1fe63de3edb.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-5dfdbb680ac299a1.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-353beaf877db2fdf.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-cd4abd33332d2d3f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-3b908b5b50ddd80c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-9cafd3521b5532d3.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-7b0935832903a9ac.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-8a349b13d67c76e3.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-9d41e7cb09eafd8e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-095194fedb4c0ec4.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-968cf83f088269ec.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-e63bbb95a6beff5c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-9f216e67c2916fa5.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-4688b763605c6a0e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-a9b2dc3244289321.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-52d5241975807511.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-9924c22ae1efcf66.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-003d83a588984e1f.rlib" "-Wl,-Bdynamic" "-lruby-2.7" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/b70888601af92f6cdc0364abab3446e418b91d36/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/libffi_example.so" "-shared" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: cannot find -lruby-2.7
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ffi_example` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "8da033c3ddd24ae3693227ab6b0b202bc483f84ef342b1b1e891cc3d4e54183c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8da033c3ddd24ae3693227ab6b0b202bc483f84ef342b1b1e891cc3d4e54183c", kill_on_drop: false }`
[INFO] [stdout] 8da033c3ddd24ae3693227ab6b0b202bc483f84ef342b1b1e891cc3d4e54183c