[INFO] cloning repository https://github.com/bentwire/stm32f072-usb-test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bentwire/stm32f072-usb-test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbentwire%2Fstm32f072-usb-test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbentwire%2Fstm32f072-usb-test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1a76e98b6408fd1d5b635020ef4552cffa45dd4f
[INFO] documenting bentwire/stm32f072-usb-test against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbentwire%2Fstm32f072-usb-test" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bentwire/stm32f072-usb-test on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config
[INFO] started tweaking git repo https://github.com/bentwire/stm32f072-usb-test
[INFO] finished tweaking git repo https://github.com/bentwire/stm32f072-usb-test
[INFO] tweaked toml for git repo https://github.com/bentwire/stm32f072-usb-test written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/bentwire/stm32f072-usb-test already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating git repository `https://github.com/bentwire/digital-filter.git`
[INFO] [stderr]     Updating git repository `https://github.com/mvirkkunen/usbd-serial`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 75c3cc5c3343a72717e892511b2e993673d8c3bf9abd0ba431bb4650bb3b37ac
[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" "75c3cc5c3343a72717e892511b2e993673d8c3bf9abd0ba431bb4650bb3b37ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75c3cc5c3343a72717e892511b2e993673d8c3bf9abd0ba431bb4650bb3b37ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75c3cc5c3343a72717e892511b2e993673d8c3bf9abd0ba431bb4650bb3b37ac", kill_on_drop: false }`
[INFO] [stdout] 75c3cc5c3343a72717e892511b2e993673d8c3bf9abd0ba431bb4650bb3b37ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 744215e3a17e01b9589ee05ac3fb665ac960e364441d122c179f733ae583547e
[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" "744215e3a17e01b9589ee05ac3fb665ac960e364441d122c179f733ae583547e", kill_on_drop: false }`
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling syn v0.15.35
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]    Compiling cortex-m-rt v0.6.8
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]    Compiling heapless v0.4.4
[INFO] [stderr]    Compiling stm32f0 v0.7.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking nb v0.1.2
[INFO] [stderr]     Checking aligned v0.2.0
[INFO] [stderr]    Compiling cortex-m-semihosting v0.3.3
[INFO] [stderr]     Checking cast v0.2.2
[INFO] [stderr]     Checking usb-device v0.2.1
[INFO] [stderr]    Compiling cortex-m-rtfm v0.4.3
[INFO] [stderr]     Checking panic-halt v0.2.0
[INFO] [stderr]    Compiling cortex-m v0.5.10
[INFO] [stderr]     Checking typenum v1.10.0
[INFO] [stderr]     Checking byteorder v1.3.2
[INFO] [stderr]     Checking embedded-hal v0.2.3
[INFO] [stderr]     Checking volatile-register v0.2.0
[INFO] [stderr]     Checking bare-metal v0.2.4
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]     Checking hash32 v0.1.0
[INFO] [stderr]     Checking generic-array v0.12.0
[INFO] [stderr]     Checking generic-array v0.11.1
[INFO] [stderr]     Checking as-slice v0.1.0
[INFO] [stderr]     Checking aligned v0.3.1
[INFO] [stderr]     Checking panic-semihosting v0.5.2
[INFO] [stderr]     Checking digital-filter v0.1.0 (https://github.com/bentwire/digital-filter.git#47339eff)
[INFO] [stderr]     Checking usbd-serial v0.1.0 (https://github.com/mvirkkunen/usbd-serial#cb18cef7)
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.5
[INFO] [stderr]    Compiling owned-singleton-macros v0.1.0
[INFO] [stderr]    Compiling cortex-m-rtfm-macros v0.4.3
[INFO] [stderr]     Checking owned-singleton v0.1.0
[INFO] [stderr]     Checking stm32f0xx-hal v0.14.1
[INFO] [stderr]     Checking stm32-usbd v0.2.1
[INFO] [stderr]  Documenting stm32f072-usb-test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: duplicate lang item in crate `panic_halt` (which `stm32f072_usb_test` depends on): `panic_impl`.
[INFO] [stdout]   |
[INFO] [stdout]   = note: the lang item is first defined in crate `panic_semihosting` (which `stm32f072_usb_test` depends on)
[INFO] [stdout]   = note: first definition in `panic_semihosting` loaded from /opt/rustwide/target/debug/deps/libpanic_semihosting-902c3fe882eb95bc.rmeta
[INFO] [stdout]   = note: second definition in `panic_halt` loaded from /opt/rustwide/target/debug/deps/libpanic_halt-33c786c69f3658f4.rmeta
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `stm32f072-usb-test`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name stm32f072_usb_test src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bare_metal=/opt/rustwide/target/debug/deps/libbare_metal-c95e4c6382279247.rmeta --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-2626ac9b661c6349.rmeta --extern cortex_m_rt=/opt/rustwide/target/debug/deps/libcortex_m_rt-553a4ceacc2f965e.rmeta --extern rtfm=/opt/rustwide/target/debug/deps/librtfm-0be623ed2f81428e.rmeta --extern cortex_m_rtfm_macros=/opt/rustwide/target/debug/deps/libcortex_m_rtfm_macros-24223321b959f1c2.so --extern cortex_m_semihosting=/opt/rustwide/target/debug/deps/libcortex_m_semihosting-803c86bee45e1057.rmeta --extern digital_filter=/opt/rustwide/target/debug/deps/libdigital_filter-4346c6fe36d42978.rmeta --extern embedded_hal=/opt/rustwide/target/debug/deps/libembedded_hal-2b45ad66532107a5.rmeta --extern panic_halt=/opt/rustwide/target/debug/deps/libpanic_halt-33c786c69f3658f4.rmeta --extern panic_semihosting=/opt/rustwide/target/debug/deps/libpanic_semihosting-902c3fe882eb95bc.rmeta --extern stm32_usbd=/opt/rustwide/target/debug/deps/libstm32_usbd-7783ea1305352703.rmeta --extern stm32f0=/opt/rustwide/target/debug/deps/libstm32f0-e37816f6aac6bb8e.rmeta --extern stm32f0xx_hal=/opt/rustwide/target/debug/deps/libstm32f0xx_hal-c938f6884977778f.rmeta --extern usb_device=/opt/rustwide/target/debug/deps/libusb_device-5f6cd1314ef86275.rmeta --extern usbd_serial=/opt/rustwide/target/debug/deps/libusbd_serial-f9d2dc89e1a4c796.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "744215e3a17e01b9589ee05ac3fb665ac960e364441d122c179f733ae583547e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "744215e3a17e01b9589ee05ac3fb665ac960e364441d122c179f733ae583547e", kill_on_drop: false }`
[INFO] [stdout] 744215e3a17e01b9589ee05ac3fb665ac960e364441d122c179f733ae583547e