[INFO] cloning repository https://github.com/LnL7/letty
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LnL7/letty" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLnL7%2Fletty", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLnL7%2Fletty'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 372be41dda29b059fef0e82720f887e92581c5c5
[INFO] testing LnL7/letty against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLnL7%2Fletty" "/workspace/builds/worker-91/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-91/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LnL7/letty on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LnL7/letty
[INFO] finished tweaking git repo https://github.com/LnL7/letty
[INFO] tweaked toml for git repo https://github.com/LnL7/letty written to /workspace/builds/worker-91/source/Cargo.toml
[INFO] crate git repo https://github.com/LnL7/letty already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 502aa54922473164bbf9fb783003818578345df1ddd03279db35b7805b0c67af
[INFO] running `Command { std: "docker" "start" "-a" "502aa54922473164bbf9fb783003818578345df1ddd03279db35b7805b0c67af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "502aa54922473164bbf9fb783003818578345df1ddd03279db35b7805b0c67af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "502aa54922473164bbf9fb783003818578345df1ddd03279db35b7805b0c67af", kill_on_drop: false }`
[INFO] [stdout] 502aa54922473164bbf9fb783003818578345df1ddd03279db35b7805b0c67af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-91/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2929796a35a8462d9c5cc96448e5a8ffeba81141a5f684c5b11845db957c3078
[INFO] running `Command { std: "docker" "start" "-a" "2929796a35a8462d9c5cc96448e5a8ffeba81141a5f684c5b11845db957c3078", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling core-foundation-sys v0.6.2
[INFO] [stderr]    Compiling io-kit-sys v0.1.0
[INFO] [stderr]    Compiling mach v0.2.3
[INFO] [stderr]    Compiling core-foundation v0.6.4
[INFO] [stderr]    Compiling letty v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: "cc" "-m64" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.1.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.10.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.11.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.12.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.13.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.14.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.15.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.2.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.3.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.4.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.5.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.6.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.7.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.8.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.9.rcgu.o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.3gsg4gbgiepzxuag.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib" "/opt/rustwide/target/debug/deps/libio_kit_sys-f685d41a48d3ff71.rlib" "/opt/rustwide/target/debug/deps/libmach-851bb6e3bea80a07.rlib" "/opt/rustwide/target/debug/deps/libcore_foundation-a32fd81b7630a9ce.rlib" "/opt/rustwide/target/debug/deps/liblibc-018f950632d25f59.rlib" "/opt/rustwide/target/debug/deps/libcore_foundation_sys-98f1d298da29ddcd.rlib" "-Wl,--start-group" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-9a950938f3668a37.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-3b1b529ec96b3df7.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-ac333df4e6839cea.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-22a9ff9d2be6d427.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-5decbb94c7d60860.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-29a9663b62a1cd00.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-6f0cee0dbab2d3f8.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-f5dc7d1d28c5c249.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-d19bda9ef557e755.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-82a955fd13db2399.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-44f3e7c1b7cc17ef.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-3ee6f750c5f3c2cf.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-ae5e1795dcba83e8.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-8d545d8592f2b534.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-c4c222675f83fd37.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-c1e9c53e75e301ed.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-beea7d9617fe25c5.rlib" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-8ef7dd43fc671f88.rlib" "-Wl,--end-group" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-80a2b295510dd038.rlib" "-Wl,-Bdynamic" "-lutil" "-ldl" "-lutil" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/beta-2021-09-08-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs"
[INFO] [stdout]   = note: /usr/bin/ld: /opt/rustwide/target/debug/deps/letty_blink-46534feac358cc72.letty_blink.f53ca692-cgu.6.rcgu.o: in function `<core_foundation::dictionary::CFDictionary<K,V> as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/dictionary.rs:29: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.11.rcgu.o): in function `core_foundation::dictionary::CFDictionary<K,V>::from_CFType_pairs':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/dictionary.rs:46: undefined reference to `kCFAllocatorDefault'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/dictionary.rs:46: undefined reference to `kCFTypeDictionaryKeyCallBacks'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/dictionary.rs:46: undefined reference to `kCFTypeDictionaryValueCallBacks'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/dictionary.rs:46: undefined reference to `CFDictionaryCreate'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.13.rcgu.o): in function `<core_foundation::number::CFNumber as core::convert::From<i32>>::from':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/number.rs:71: undefined reference to `kCFAllocatorDefault'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/number.rs:70: undefined reference to `CFNumberCreate'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `<letty::hid::manager::IOHIDManager as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:29: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `letty::hid::manager::IOHIDManager::new':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:35: undefined reference to `kCFAllocatorDefault'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/manager.rs:35: undefined reference to `IOHIDManagerCreate'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `letty::hid::manager::IOHIDManager::open':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:48: undefined reference to `IOHIDManagerOpen'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `letty::hid::manager::IOHIDManager::close':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:56: undefined reference to `IOHIDManagerSetDeviceMatching'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/manager.rs:57: undefined reference to `IOHIDManagerClose'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `letty::hid::manager::IOHIDManager::set_device_matching':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:61: undefined reference to `IOHIDManagerSetDeviceMatching'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.14.rcgu.o): in function `letty::hid::manager::IOHIDManager::get_devices':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/manager.rs:65: undefined reference to `IOHIDManagerCopyDevices'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/manager.rs:69: undefined reference to `CFSetGetCount'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/manager.rs:72: undefined reference to `CFSetApplyFunction'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/manager.rs:74: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.15.rcgu.o): in function `core_foundation::string::CFString::new':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/string.rs:111: undefined reference to `kCFAllocatorDefault'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/string.rs:111: undefined reference to `CFStringCreateWithBytes'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.4.rcgu.o): in function `<letty::hid::device::IOHIDDevice as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/device.rs:27: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.4.rcgu.o): in function `letty::hid::device::IOHIDDevice::get_matching_elements':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/device.rs:34: undefined reference to `IOHIDDeviceCopyMatchingElements'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:40: undefined reference to `CFArrayGetCount'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:55: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:44: undefined reference to `CFArrayGetValueAtIndex'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.4.rcgu.o): in function `letty::hid::device::IOHIDDevice::set_value':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/device.rs:85: undefined reference to `kCFAllocatorDefault'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:85: undefined reference to `IOHIDValueCreateWithIntegerValue'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:86: undefined reference to `IOHIDDeviceSetValue'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/workdir/src/hid/device.rs:88: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.4.rcgu.o): in function `<letty::hid::device::IOHIDDevice as core_foundation::base::TCFType>::wrap_under_get_rule':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/lib.rs:98: undefined reference to `CFRetain'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.7.rcgu.o): in function `<letty::hid::element::IOHIDElement as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/workdir/src/hid/element.rs:20: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libletty-3b71f341e00a9abf.rlib(letty-3b71f341e00a9abf.letty.87df90cc-cgu.7.rcgu.o): in function `<letty::hid::element::IOHIDElement as core_foundation::base::TCFType>::wrap_under_get_rule':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/lib.rs:98: undefined reference to `CFRetain'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libcore_foundation-a32fd81b7630a9ce.rlib(core_foundation-a32fd81b7630a9ce.core_foundation.b930b0ca-cgu.12.rcgu.o): in function `<core_foundation::number::CFNumber as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/lib.rs:67: undefined reference to `CFRelease'
[INFO] [stdout]           /usr/bin/ld: /opt/rustwide/target/debug/deps/libcore_foundation-a32fd81b7630a9ce.rlib(core_foundation-a32fd81b7630a9ce.core_foundation.b930b0ca-cgu.2.rcgu.o): in function `<core_foundation::string::CFString as core::ops::drop::Drop>::drop':
[INFO] [stdout]           /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/core-foundation-0.6.4/src/lib.rs:67: undefined reference to `CFRelease'
[INFO] [stdout]           collect2: error: ld returned 1 exit status
[INFO] [stdout]           
[INFO] [stdout]   = help: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
[INFO] [stdout]   = note: use the `-l` flag to specify native libraries to link
[INFO] [stdout]   = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `letty` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2929796a35a8462d9c5cc96448e5a8ffeba81141a5f684c5b11845db957c3078", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2929796a35a8462d9c5cc96448e5a8ffeba81141a5f684c5b11845db957c3078", kill_on_drop: false }`
[INFO] [stdout] 2929796a35a8462d9c5cc96448e5a8ffeba81141a5f684c5b11845db957c3078