[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] building danielpclark/bench_ruby_ffi_example against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[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 ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "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-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" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--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-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" "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" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6b59292b04b370f090e16c27ca7ed2b4a45cd1fd9c9f3d6353390f2d9a800e9c
[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" "6b59292b04b370f090e16c27ca7ed2b4a45cd1fd9c9f3d6353390f2d9a800e9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6b59292b04b370f090e16c27ca7ed2b4a45cd1fd9c9f3d6353390f2d9a800e9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b59292b04b370f090e16c27ca7ed2b4a45cd1fd9c9f3d6353390f2d9a800e9c", kill_on_drop: false }`
[INFO] [stdout] 6b59292b04b370f090e16c27ca7ed2b4a45cd1fd9c9f3d6353390f2d9a800e9c
[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" "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" "+ff34b919075f35a1787659e9c448a34b06bab8de" "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] c58b9a46b9e9b85397d628e15e2d48f902ba6a2452598950e746e8e330c3d99d
[INFO] running `Command { std: "docker" "start" "-a" "c58b9a46b9e9b85397d628e15e2d48f902ba6a2452598950e746e8e330c3d99d", 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 status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-Wl,--as-needed" "-L" "/opt/rustwide/rustup-home/toolchains/ff34b919075f35a1787659e9c448a34b06bab8de/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/rustcrB8U6e/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/ff34b919075f35a1787659e9c448a34b06bab8de/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libarray_tool-09fd4a944559bb83.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libruru-e2f0f97736caac01.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libruby_sys-5ebd416fec4382a4.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/liblibc-2bb794af7d0dff71.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/liblazy_static-03a9b9f2254b644b.rlib" "-Wl,--no-whole-archive" "-Wl,--start-group" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libstd-c6dddd3d354e6bea.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libpanic_unwind-c2ca47afdcc5e309.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libminiz_oxide-b47be2942017e108.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libadler-20a1e49116ab0df9.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libobject-25e09d9868291683.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libaddr2line-9c99fb6e5ca5159e.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libgimli-85040d7563599960.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libstd_detect-0e4f7587da8acf20.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/librustc_demangle-7be0a6711ed15b5c.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libhashbrown-00672fabc4ff9c9d.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/librustc_std_workspace_alloc-72fe231ef0473d15.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libunwind-019d54ecc304b655.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libcfg_if-cc7d9343e4f608be.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/liblibc-e41c6d24baeb2249.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/liballoc-9849bb0fbad7f0f5.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/librustc_std_workspace_core-a1fd7734706d5518.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustcrB8U6e/libcore-c8ded1707ad10767.rlib" "-Wl,--no-whole-archive" "-Wl,--end-group" "/tmp/rustcrB8U6e/libcompiler_builtins-8b33f9cbbc9652fe.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" "c58b9a46b9e9b85397d628e15e2d48f902ba6a2452598950e746e8e330c3d99d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c58b9a46b9e9b85397d628e15e2d48f902ba6a2452598950e746e8e330c3d99d", kill_on_drop: false }`
[INFO] [stdout] c58b9a46b9e9b85397d628e15e2d48f902ba6a2452598950e746e8e330c3d99d
