[INFO] updating cached 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" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2f8fae8311f8d69695d428e538201c98ba2c67c2
[INFO] testing danielpclark/bench_ruby_ffi_example against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielpclark/bench_ruby_ffi_example on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "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-7/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-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "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] 865843048d0a5ffc7f755142e79800ffc54bfee779df84015fd38ab937bbfac0
[INFO] running `Command { std: "docker" "start" "-a" "865843048d0a5ffc7f755142e79800ffc54bfee779df84015fd38ab937bbfac0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "865843048d0a5ffc7f755142e79800ffc54bfee779df84015fd38ab937bbfac0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "865843048d0a5ffc7f755142e79800ffc54bfee779df84015fd38ab937bbfac0", kill_on_drop: false }`
[INFO] [stdout] 865843048d0a5ffc7f755142e79800ffc54bfee779df84015fd38ab937bbfac0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22305015681fabd37723dcd708e2416e9889a48e5f87d5fc57ec497718094a1f
[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" "22305015681fabd37723dcd708e2416e9889a48e5f87d5fc57ec497718094a1f", 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-2020-07-24-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/rustcN4Htne/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-2020-07-24-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libarray_tool-58cb43962909bf2e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libruru-b87009c5d711e6bf.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libruby_sys-e15916966199a5f7.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/liblibc-4e392bb6aa69724a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/liblazy_static-ab866502a42cf9ae.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libstd-d66e0ceb8eaec9b8.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libpanic_unwind-9717ec0599b569a0.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libhashbrown-04369de9ba916647.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/librustc_std_workspace_alloc-997d622c2e4dbe5c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libbacktrace-0359c4288a5ef89f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libbacktrace_sys-1b25ede22d698ab3.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/librustc_demangle-37940b486a68e488.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libunwind-06b77c27e794c7c6.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libcfg_if-4d07e02a8df36da1.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/liblibc-fb29e0695c0a0f79.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/liballoc-e16188b4cf97e8bb.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/librustc_std_workspace_core-5eb391c8dabdee77.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcN4Htne/libcore-b0689b528b222bee.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcN4Htne/libcompiler_builtins-ed072ac495e62e7a.rlib" "-Wl,-Bdynamic" "-lruby-2.7" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil"
[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" "22305015681fabd37723dcd708e2416e9889a48e5f87d5fc57ec497718094a1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22305015681fabd37723dcd708e2416e9889a48e5f87d5fc57ec497718094a1f", kill_on_drop: false }`
[INFO] [stdout] 22305015681fabd37723dcd708e2416e9889a48e5f87d5fc57ec497718094a1f