[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 try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielpclark%2Fbench_ruby_ffi_example" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielpclark/bench_ruby_ffi_example on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "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-3/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" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded array_tool v0.4.1
[INFO] [stderr]   Downloaded ruby-sys v0.2.20
[INFO] [stderr]   Downloaded ruru v0.9.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "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] c57d9c5a80b31ed8e4a5abfe9e36d969865e5e5c205261edeb36ed563c82b4c9
[INFO] running `Command { std: "docker" "start" "-a" "c57d9c5a80b31ed8e4a5abfe9e36d969865e5e5c205261edeb36ed563c82b4c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c57d9c5a80b31ed8e4a5abfe9e36d969865e5e5c205261edeb36ed563c82b4c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c57d9c5a80b31ed8e4a5abfe9e36d969865e5e5c205261edeb36ed563c82b4c9", kill_on_drop: false }`
[INFO] [stdout] c57d9c5a80b31ed8e4a5abfe9e36d969865e5e5c205261edeb36ed563c82b4c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "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] 6b67af31521071a1c646c0490e490c326a925e6c439b19639bbe275ee2c0a484
[INFO] running `Command { std: "docker" "start" "-a" "6b67af31521071a1c646c0490e490c326a925e6c439b19639bbe275ee2c0a484", kill_on_drop: false }`
[INFO] [stderr]    Compiling ruby-sys v0.2.20
[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 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" "-m64" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-Wl,--as-needed" "-L" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.ffi_example.2xq7ktse-cgu.9.rcgu.o" "-o" "/opt/rustwide/target/debug/deps/libffi_example.so" "-Wl,--version-script=/tmp/rustcQSVWrK/list" "/opt/rustwide/target/debug/deps/ffi_example.2mbh1o9p8c1dyu9j.rcgu.o" "/opt/rustwide/target/debug/deps/ffi_example.x3870c36f56yah1.rcgu.o" "-shared" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/rustwide/target/debug/deps" "-L" "/usr/lib" "-L" "/opt/rustwide/rustup-home/toolchains/ce59db7a1b1b012fb2793c4641c1bdecad7a128b/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libarray_tool-09fd4a944559bb83.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libruru-e2f0f97736caac01.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libruby_sys-5ebd416fec4382a4.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/liblibc-2bb794af7d0dff71.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/liblazy_static-03a9b9f2254b644b.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libstd-21256c14e4504640.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libpanic_unwind-986e7fea4474d4d2.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libminiz_oxide-91d85f45babdb06e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libadler-756509c31813f9a6.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libobject-5c2ef587e740c0cc.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libaddr2line-ad8f9371d31db1b3.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libgimli-402820fb3b4d3dd8.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libstd_detect-5e8e903f07dc8747.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/librustc_demangle-7ab9ae5080c07187.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libhashbrown-c8e8d47c6bf14de2.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/librustc_std_workspace_alloc-5a02dbb58abd015a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libunwind-cedc8fec61444895.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libcfg_if-a1c96351c52bc56a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/liblibc-e41c6d24baeb2249.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/liballoc-62493b241881590c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/librustc_std_workspace_core-a1fd7734706d5518.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcQSVWrK/libcore-c8ded1707ad10767.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcQSVWrK/libcompiler_builtins-1eec8756baa5bc24.rlib" "-Wl,-Bdynamic" "-lruby-2.7" "-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" "6b67af31521071a1c646c0490e490c326a925e6c439b19639bbe275ee2c0a484", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b67af31521071a1c646c0490e490c326a925e6c439b19639bbe275ee2c0a484", kill_on_drop: false }`
[INFO] [stdout] 6b67af31521071a1c646c0490e490c326a925e6c439b19639bbe275ee2c0a484