[INFO] cloning repository https://github.com/brianalexander/rust_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brianalexander/rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c03ec669a2c7c906816b479b73a776dd7c3eba98
[INFO] checking brianalexander/rust_os against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os" "/workspace/builds/worker-90/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-90/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/brianalexander/rust_os on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-90/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/brianalexander/rust_os
[INFO] finished tweaking git repo https://github.com/brianalexander/rust_os
[INFO] tweaked toml for git repo https://github.com/brianalexander/rust_os written to /workspace/builds/worker-90/source/Cargo.toml
[INFO] crate git repo https://github.com/brianalexander/rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d594314ef8aaa58623b4d7c3f7829162471d92dcd2f542ff90c192d877e800bc
[INFO] running `Command { std: "docker" "start" "-a" "d594314ef8aaa58623b4d7c3f7829162471d92dcd2f542ff90c192d877e800bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d594314ef8aaa58623b4d7c3f7829162471d92dcd2f542ff90c192d877e800bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d594314ef8aaa58623b4d7c3f7829162471d92dcd2f542ff90c192d877e800bc", kill_on_drop: false }`
[INFO] [stdout] d594314ef8aaa58623b4d7c3f7829162471d92dcd2f542ff90c192d877e800bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-90/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" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 936a83a821aeacba45e5cfa86784c4cbe395ae597f2babf29e8411c04d293447
[INFO] running `Command { std: "docker" "start" "-a" "936a83a821aeacba45e5cfa86784c4cbe395ae597f2babf29e8411c04d293447", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking blog_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0428]: the name `_start` is defined multiple times
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ------------------------------- previous definition of the value `_start` here
[INFO] [stdout] ...
[INFO] [stdout] 12 | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `_start` redefined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `_start` must be defined only once in the value namespace of this module
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0428`.
[INFO] [stdout] 
[INFO] [stdout] error[E0428]: the name `_start` is defined multiple times
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ------------------------------- previous definition of the value `_start` here
[INFO] [stdout] ...
[INFO] [stdout] 12 | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `_start` redefined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `_start` must be defined only once in the value namespace of this module
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]   --> src/main.rs:28:1
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn panic(_info: &PanicInfo) -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the lang item is first defined in crate `std` (which `test` depends on)
[INFO] [stdout]    = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/1.55.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-008055cc7d873802.rlib
[INFO] [stdout]    = note: second definition in the local crate (`blog_os`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blog_os` due to 2 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0152, E0428.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "936a83a821aeacba45e5cfa86784c4cbe395ae597f2babf29e8411c04d293447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "936a83a821aeacba45e5cfa86784c4cbe395ae597f2babf29e8411c04d293447", kill_on_drop: false }`
[INFO] [stdout] 936a83a821aeacba45e5cfa86784c4cbe395ae597f2babf29e8411c04d293447
