[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 beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielpclark/bench_ruby_ffi_example on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", 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-0/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" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "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] aac4da07d8ae5664e1356bc23143e3d46ee0297ae5c6e9e079813d7ee94301dc
[INFO] running `Command { std: "docker" "start" "-a" "aac4da07d8ae5664e1356bc23143e3d46ee0297ae5c6e9e079813d7ee94301dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aac4da07d8ae5664e1356bc23143e3d46ee0297ae5c6e9e079813d7ee94301dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aac4da07d8ae5664e1356bc23143e3d46ee0297ae5c6e9e079813d7ee94301dc", kill_on_drop: false }`
[INFO] [stdout] aac4da07d8ae5664e1356bc23143e3d46ee0297ae5c6e9e079813d7ee94301dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", 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] 389ddbfcf9cfa73d9d94bf1932d344215cdd8aa21e76902ccbf6e6704be6580d
[INFO] running `Command { std: "docker" "start" "-a" "389ddbfcf9cfa73d9d94bf1932d344215cdd8aa21e76902ccbf6e6704be6580d", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruby-sys v0.2.20
[INFO] [stderr]    Compiling libc v0.2.33
[INFO] [stderr]    Compiling lazy_static v0.2.9
[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 a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit code: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,--eh-frame-hdr" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-01-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.6skdqt6n-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/libffi_example.so" "-Wl,--version-script=/tmp/rustczZviGp/list" "/opt/rustwide/target/debug/deps/ffi_example.3s7ff8uk2f6l1x54.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.7ev6yys56tczrsw.rcgu.o" "-shared" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/usr/lib" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-01-01-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustczZviGp/libarray_tool-dd119cb5711965f9.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libruru-6d8fa80b5b4973b9.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libruby_sys-3d138027b2228215.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/liblibc-ceb54f6b55e8108f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/liblazy_static-96378014adbb591c.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustczZviGp/libstd-7444fd17919e9af0.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libpanic_unwind-0ee2f67026959ab7.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libminiz_oxide-df1bcd1e82256d04.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libadler-ed9ecf1b54021131.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libobject-0ede66bb24e94b96.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libaddr2line-7c2de7f50940865c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libgimli-b138d50085fd4683.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/librustc_demangle-6576870d8f2b9ae2.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libhashbrown-042a30c5f67b2c91.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/librustc_std_workspace_alloc-7b3f33d3dbe385dc.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libunwind-90b3063cd7b22527.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libcfg_if-17f9484f8dc4da1e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/liblibc-df38345acd9d92e1.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/liballoc-a5e10ca10bdd9e54.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/librustc_std_workspace_core-9e5b4162eeef2cef.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustczZviGp/libcore-3a4e739a77468800.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustczZviGp/libcompiler_builtins-0f3a0c116d5e04d6.rlib" "-Wl,-Bdynamic" "-lruby-2.7" "-lutil" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc"
[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`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "389ddbfcf9cfa73d9d94bf1932d344215cdd8aa21e76902ccbf6e6704be6580d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "389ddbfcf9cfa73d9d94bf1932d344215cdd8aa21e76902ccbf6e6704be6580d", kill_on_drop: false }`
[INFO] [stdout] 389ddbfcf9cfa73d9d94bf1932d344215cdd8aa21e76902ccbf6e6704be6580d