[INFO] cloning repository https://github.com/rofrol/microbit-blinky
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rofrol/microbit-blinky" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frofrol%2Fmicrobit-blinky", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frofrol%2Fmicrobit-blinky'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ee3b309203ae21192d6f7ae6805baa3a2d88910a
[INFO] documenting rofrol/microbit-blinky against 1.47.0 for beta-1.48-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frofrol%2Fmicrobit-blinky" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rofrol/microbit-blinky on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-12/source/.cargo/config
[INFO] started tweaking git repo https://github.com/rofrol/microbit-blinky
[INFO] finished tweaking git repo https://github.com/rofrol/microbit-blinky
[INFO] tweaked toml for git repo https://github.com/rofrol/microbit-blinky written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/rofrol/microbit-blinky already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1efd6c7c56584ed507ce5830b248bcfafe71dc28aaee68bdbda820f89dd2e77
[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" "c1efd6c7c56584ed507ce5830b248bcfafe71dc28aaee68bdbda820f89dd2e77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1efd6c7c56584ed507ce5830b248bcfafe71dc28aaee68bdbda820f89dd2e77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1efd6c7c56584ed507ce5830b248bcfafe71dc28aaee68bdbda820f89dd2e77", kill_on_drop: false }`
[INFO] [stdout] c1efd6c7c56584ed507ce5830b248bcfafe71dc28aaee68bdbda820f89dd2e77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d4c8a5e19d851943a77466f44f4ced26de710471d542b830a0213add608aa0c
[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" "3d4c8a5e19d851943a77466f44f4ced26de710471d542b830a0213add608aa0c", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.6.1
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling cortex-m-rt v0.6.11
[INFO] [stderr]    Compiling nrf51 v0.7.0
[INFO] [stderr]    Compiling microbit v0.8.0
[INFO] [stderr]     Checking fpa v0.1.0
[INFO] [stderr]    Compiling cortex-m-semihosting v0.3.5
[INFO] [stderr]     Checking panic-semihosting v0.5.3
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.7
[INFO] [stderr]     Checking nrf51-hal v0.7.1
[INFO] [stderr]  Documenting microrust-start v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: duplicate lang item in crate `panic_halt` (which `microrust_start` depends on): `panic_impl`.
[INFO] [stdout]   |
[INFO] [stdout]   = note: the lang item is first defined in crate `panic_semihosting` (which `microrust_start` depends on)
[INFO] [stdout]   = note: first definition in `panic_semihosting` loaded from /opt/rustwide/target/debug/deps/libpanic_semihosting-5f76604d0bfd9c71.rmeta
[INFO] [stdout]   = note: second definition in `panic_halt` loaded from /opt/rustwide/target/debug/deps/libpanic_halt-cf482e4f96cba0d0.rmeta
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `microrust-start`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name microrust_start 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 cortex_m_rt=/opt/rustwide/target/debug/deps/libcortex_m_rt-9803062c029fbf8b.rmeta --extern cortex_m_semihosting=/opt/rustwide/target/debug/deps/libcortex_m_semihosting-523c1993f2594d01.rmeta --extern microbit=/opt/rustwide/target/debug/deps/libmicrobit-74ae4192b568dd69.rmeta --extern panic_halt=/opt/rustwide/target/debug/deps/libpanic_halt-cf482e4f96cba0d0.rmeta --extern panic_semihosting=/opt/rustwide/target/debug/deps/libpanic_semihosting-5f76604d0bfd9c71.rmeta --cap-lints=warn --crate-version 1.0.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "3d4c8a5e19d851943a77466f44f4ced26de710471d542b830a0213add608aa0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d4c8a5e19d851943a77466f44f4ced26de710471d542b830a0213add608aa0c", kill_on_drop: false }`
[INFO] [stdout] 3d4c8a5e19d851943a77466f44f4ced26de710471d542b830a0213add608aa0c
