[INFO] updating cached repository jgall/obj_c_rust_test
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jgall/obj_c_rust_test
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jgall/obj_c_rust_test" "work/ex/beta-1.38-1/sources/1.37.0/gh/jgall/obj_c_rust_test"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jgall/obj_c_rust_test'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jgall/obj_c_rust_test" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jgall/obj_c_rust_test"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jgall/obj_c_rust_test'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d99b84868cb9ecc7c2762735db8b31f3642a9f17
[INFO] sha for GitHub repo jgall/obj_c_rust_test: d99b84868cb9ecc7c2762735db8b31f3642a9f17
[INFO] validating manifest of jgall/obj_c_rust_test on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jgall/obj_c_rust_test on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jgall/obj_c_rust_test
[INFO] finished frobbing jgall/obj_c_rust_test
[INFO] frobbed toml for jgall/obj_c_rust_test written to work/ex/beta-1.38-1/sources/1.37.0/gh/jgall/obj_c_rust_test/Cargo.toml
[INFO] started frobbing jgall/obj_c_rust_test
[INFO] finished frobbing jgall/obj_c_rust_test
[INFO] frobbed toml for jgall/obj_c_rust_test written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jgall/obj_c_rust_test/Cargo.toml
[INFO] crate jgall/obj_c_rust_test already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jgall/obj_c_rust_test against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jgall/obj_c_rust_test:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 36e817c1b1839388670cdf094e8da4c683b2a678489b471f00575c7af7d61a6e
[INFO] running `"docker" "start" "-a" "36e817c1b1839388670cdf094e8da4c683b2a678489b471f00575c7af7d61a6e"`
[INFO] [stderr]    Compiling malloc_buf v0.0.6
[INFO] [stderr]    Compiling objc v0.2.5
[INFO] [stderr]    Compiling obj_c_rust_test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `objc::declare::ClassDecl`
[INFO] [stderr]  --> src/class.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use objc::declare::ClassDecl;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Class`, `Object`, `Sel`
[INFO] [stderr]  --> src/class.rs:2:21
[INFO] [stderr]   |
[INFO] [stderr] 2 | use objc::runtime::{Class, Object, Sel};
[INFO] [stderr]   |                     ^^^^^  ^^^^^^  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:22:24
[INFO] [stderr]    |
[INFO] [stderr] 22 |       let my_box_class = register_class!(MyBox:NSObject with {
[INFO] [stderr]    |  ________________________^
[INFO] [stderr] 23 | |         (pub width: u32),
[INFO] [stderr] 24 | |         (priv height: u32),
[INFO] [stderr] 25 | |         (sel getThing:withOtherThing: <- my_method),
[INFO] [stderr] ...  |
[INFO] [stderr] 28 | |         }),
[INFO] [stderr] 29 | |     });
[INFO] [stderr]    | |______^ in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:22:24
[INFO] [stderr]    |
[INFO] [stderr] 22 |       let my_box_class = register_class!(MyBox:NSObject with {
[INFO] [stderr]    |  ________________________^
[INFO] [stderr] 23 | |         (pub width: u32),
[INFO] [stderr] 24 | |         (priv height: u32),
[INFO] [stderr] 25 | |         (sel getThing:withOtherThing: <- my_method),
[INFO] [stderr] ...  |
[INFO] [stderr] 28 | |         }),
[INFO] [stderr] 29 | |     });
[INFO] [stderr]    | |______^ in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:22:24
[INFO] [stderr]    |
[INFO] [stderr] 22 |       let my_box_class = register_class!(MyBox:NSObject with {
[INFO] [stderr]    |  ________________________^
[INFO] [stderr] 23 | |         (pub width: u32),
[INFO] [stderr] 24 | |         (priv height: u32),
[INFO] [stderr] 25 | |         (sel getThing:withOtherThing: <- my_method),
[INFO] [stderr] ...  |
[INFO] [stderr] 28 | |         }),
[INFO] [stderr] 29 | |     });
[INFO] [stderr]    | |______^ in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:22:24
[INFO] [stderr]    |
[INFO] [stderr] 22 |       let my_box_class = register_class!(MyBox:NSObject with {
[INFO] [stderr]    |  ________________________^
[INFO] [stderr] 23 | |         (pub width: u32),
[INFO] [stderr] 24 | |         (priv height: u32),
[INFO] [stderr] 25 | |         (sel getThing:withOtherThing: <- my_method),
[INFO] [stderr] ...  |
[INFO] [stderr] 28 | |         }),
[INFO] [stderr] 29 | |     });
[INFO] [stderr]    | |______^ in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:22:24
[INFO] [stderr]    |
[INFO] [stderr] 22 |       let my_box_class = register_class!(MyBox:NSObject with {
[INFO] [stderr]    |  ________________________^
[INFO] [stderr] 23 | |         (pub width: u32),
[INFO] [stderr] 24 | |         (priv height: u32),
[INFO] [stderr] 25 | |         (sel getThing:withOtherThing: <- my_method),
[INFO] [stderr] ...  |
[INFO] [stderr] 28 | |         }),
[INFO] [stderr] 29 | |     });
[INFO] [stderr]    | |______^ in this macro invocation
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:31:27
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let x: i32 = unsafe { msg_send![*obj, getThing:5i32 withOtherThing:6i32] };
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:46:32
[INFO] [stderr]    |
[INFO] [stderr] 46 |         let obj: *mut Object = msg_send![cls, alloc];
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:47:32
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let obj: *mut Object = msg_send![obj, init];
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:57:20
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let hash_sel = sel!(hash);
[INFO] [stderr]    |                    ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> src/main.rs:64:32
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let hash: usize = unsafe { msg_send![*obj, hash] };
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `obj`
[INFO] [stderr]   --> src/main.rs:17:30
[INFO] [stderr]    |
[INFO] [stderr] 17 |     extern "C" fn obj_method(obj: &mut Object, sel: Sel, i1: i32, i2: i32) -> i32 {
[INFO] [stderr]    |                              ^^^ help: consider prefixing with an underscore: `_obj`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sel`
[INFO] [stderr]   --> src/main.rs:17:48
[INFO] [stderr]    |
[INFO] [stderr] 17 |     extern "C" fn obj_method(obj: &mut Object, sel: Sel, i1: i32, i2: i32) -> i32 {
[INFO] [stderr]    |                                                ^^^ help: consider prefixing with an underscore: `_sel`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i1`
[INFO] [stderr]   --> src/main.rs:17:58
[INFO] [stderr]    |
[INFO] [stderr] 17 |     extern "C" fn obj_method(obj: &mut Object, sel: Sel, i1: i32, i2: i32) -> i32 {
[INFO] [stderr]    |                                                          ^^ help: consider prefixing with an underscore: `_i1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i2`
[INFO] [stderr]   --> src/main.rs:17:67
[INFO] [stderr]    |
[INFO] [stderr] 17 |     extern "C" fn obj_method(obj: &mut Object, sel: Sel, i1: i32, i2: i32) -> i32 {
[INFO] [stderr]    |                                                                   ^^ help: consider prefixing with an underscore: `_i2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `obj`
[INFO] [stderr]   --> src/main.rs:26:68
[INFO] [stderr]    |
[INFO] [stderr] 26 |         (sel getThing2:(u32)t1 withOtherThing:(u32)t2 -> u32 with |obj, sel| {
[INFO] [stderr]    |                                                                    ^^^ help: consider prefixing with an underscore: `_obj`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `sel`
[INFO] [stderr]   --> src/main.rs:26:73
[INFO] [stderr]    |
[INFO] [stderr] 26 |         (sel getThing2:(u32)t1 withOtherThing:(u32)t2 -> u32 with |obj, sel| {
[INFO] [stderr]    |                                                                         ^^^ help: consider prefixing with an underscore: `_sel`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t1`
[INFO] [stderr]   --> src/main.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 26 |         (sel getThing2:(u32)t1 withOtherThing:(u32)t2 -> u32 with |obj, sel| {
[INFO] [stderr]    |                             ^^ help: consider prefixing with an underscore: `_t1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `t2`
[INFO] [stderr]   --> src/main.rs:26:52
[INFO] [stderr]    |
[INFO] [stderr] 26 |         (sel getThing2:(u32)t1 withOtherThing:(u32)t2 -> u32 with |obj, sel| {
[INFO] [stderr]    |                                                    ^^ help: consider prefixing with an underscore: `_t2`
[INFO] [stderr] 
[INFO] [stderr] error: linking with `cc` failed: exit code: 1
[INFO] [stderr]   |
[INFO] [stderr]   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.0.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.1.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.10.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.11.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.12.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.13.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.14.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.15.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.2.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.3.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.4.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.5.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.6.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.7.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.8.rcgu.o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.obj_c_rust_test.5xiq1cfa-cgu.9.rcgu.o" "-o" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d" "/opt/crater/target/debug/deps/obj_c_rust_test-3a601b2a061e400d.3uzbex5npp8o2qs4.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/opt/crater/target/debug/deps" "-L" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/crater/target/debug/deps/libobjc-8e641ed94c5d7427.rlib" "/opt/crater/target/debug/deps/libmalloc_buf-f172d3530ec6793e.rlib" "/opt/crater/target/debug/deps/liblibc-170ea71780cbca2d.rlib" "-Wl,--start-group" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-1d6d86bd078a28e9.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-e9721e46a424e2a9.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-c07193698f282147.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-6da45690f3863086.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-690797036dd27680.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-d3896ccbfd8eda2b.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-7cccc3739e3d7623.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-5e9ba178a513cd29.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-5ca9f83bf63d1f4b.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-bba1c7ef9e950882.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-e23c9de62012deb5.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-9b59dffdcd513d5d.rlib" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-17392340ab2e4a97.rlib" "-Wl,--end-group" "/opt/crater/rustup-home/toolchains/beta-2019-08-13-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-ac21508a81e3f7f3.rlib" "-Wl,-Bdynamic" "-lobjc" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
[INFO] [stderr]   = note: /opt/crater/target/debug/deps/libobjc-8e641ed94c5d7427.rlib(objc-8e641ed94c5d7427.objc.a43g9h42-cgu.1.rcgu.o): In function `objc::runtime::Object::class':
[INFO] [stderr]           /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/objc-0.2.5/src/runtime.rs:464: undefined reference to `object_getClass'
[INFO] [stderr]           /opt/crater/target/debug/deps/libobjc-8e641ed94c5d7427.rlib(objc-8e641ed94c5d7427.objc.a43g9h42-cgu.11.rcgu.o): In function `<objc::rc::strong::StrongPtr as core::ops::drop::Drop>::drop':
[INFO] [stderr]           /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/objc-0.2.5/src/rc/strong.rs:48: undefined reference to `objc_release'
[INFO] [stderr]           collect2: error: ld returned 1 exit status
[INFO] [stderr]           
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `obj_c_rust_test`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "36e817c1b1839388670cdf094e8da4c683b2a678489b471f00575c7af7d61a6e"`
[INFO] running `"docker" "rm" "-f" "36e817c1b1839388670cdf094e8da4c683b2a678489b471f00575c7af7d61a6e"`
[INFO] [stdout] 36e817c1b1839388670cdf094e8da4c683b2a678489b471f00575c7af7d61a6e