[INFO] fetching crate tg-ch1-lab 0.4.2-preview.1...
[INFO] testing tg-ch1-lab-0.4.2-preview.1 against 1.99.0-beta.8 for beta-1.100-2
[INFO] extracting crate tg-ch1-lab 0.4.2-preview.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate tg-ch1-lab 0.4.2-preview.1
[INFO] finished tweaking crates.io crate tg-ch1-lab 0.4.2-preview.1
[INFO] tweaked toml for crates.io crate tg-ch1-lab 0.4.2-preview.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate tg-ch1-lab 0.4.2-preview.1 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate tg-ch1-lab 0.4.2-preview.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tg-sbi v0.4.2-preview.1
[INFO] [stderr]   Downloaded tg-console v0.4.2-preview.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982
[INFO] running `Command { std: "docker" "start" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling log v0.4.29
[INFO] [stderr]    Compiling tg-ch1-lab v0.4.2-preview.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling tg-sbi v0.4.2-preview.1
[INFO] [stderr]    Compiling lock_api v0.4.14
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling tg-console v0.4.2-preview.1
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `Command { std: "docker" "inspect" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling tg-sbi v0.4.2-preview.1
[INFO] [stderr]    Compiling tg-console v0.4.2-preview.1
[INFO] [stderr]    Compiling tg-ch1-lab v0.4.2-preview.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]   --> src/main.rs:79:1
[INFO] [stdout]    |
[INFO] [stdout] 79 | / fn panic(_info: &core::panic::PanicInfo) -> ! {
[INFO] [stdout] 80 | |     loop {}
[INFO] [stdout] 81 | | }
[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/1.99.0-beta.8-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-3ebd33b08985d8a2.so, /opt/rustwide/rustup-home/toolchains/1.99.0-beta.8-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-3ebd33b08985d8a2.rlib, /opt/rustwide/rustup-home/toolchains/1.99.0-beta.8-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-3ebd33b08985d8a2.rmeta
[INFO] [stdout]    = note: second definition in the local crate (`tg_ch1_lab`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tg-ch1-lab` (bin "tg-ch1-lab" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982", kill_on_drop: false }`
[INFO] [stdout] e29e9a9bf2b8e1a82ede0257574de4686ae40f8c3b6fa49a02d133bb9d74a982
