[INFO] cloning repository https://github.com/vkobel/mini_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/vkobel/mini_rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bdce3bc0f49b9e0848c9ee2bf5234178992c30a7
[INFO] testing vkobel/mini_rust_os against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os" "/workspace/builds/worker-51/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vkobel/mini_rust_os on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vkobel/mini_rust_os
[INFO] finished tweaking git repo https://github.com/vkobel/mini_rust_os
[INFO] tweaked toml for git repo https://github.com/vkobel/mini_rust_os written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate git repo https://github.com/vkobel/mini_rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rlibc v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5ec4faea70ca83d0618ff0b171d7bc4450e2e538256a7b0d4afbdd60d78eafc
[INFO] running `Command { std: "docker" "start" "-a" "d5ec4faea70ca83d0618ff0b171d7bc4450e2e538256a7b0d4afbdd60d78eafc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5ec4faea70ca83d0618ff0b171d7bc4450e2e538256a7b0d4afbdd60d78eafc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5ec4faea70ca83d0618ff0b171d7bc4450e2e538256a7b0d4afbdd60d78eafc", kill_on_drop: false }`
[INFO] [stdout] d5ec4faea70ca83d0618ff0b171d7bc4450e2e538256a7b0d4afbdd60d78eafc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85bd4f9d5d3171bd847b32be6038e5d551d089c8f230dfbf363898db630589f4
[INFO] running `Command { std: "docker" "start" "-a" "85bd4f9d5d3171bd847b32be6038e5d551d089c8f230dfbf363898db630589f4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rlibc v0.1.5
[INFO] [stderr]    Compiling mini_rust_os v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(lang_items)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_fmt`
[INFO] [stdout]   --> src/lib.rs:26:23
[INFO] [stdout]    |
[INFO] [stdout] 26 | #[lang = "panic_fmt"] extern fn panic_fmt() -> ! {loop{}}
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the lang item is first defined in crate `core` (which `mini_rust_os` depends on)
[INFO] [stdout]    = note: first definition in `core` loaded from /opt/rustwide/rustup-home/toolchains/1.60.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-1d1f2d1bec6f51b8.rlib
[INFO] [stdout]    = note: second definition in the local crate (`mini_rust_os`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[panic_handler]` function required, but not found
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mini_rust_os` due to 4 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0152, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "85bd4f9d5d3171bd847b32be6038e5d551d089c8f230dfbf363898db630589f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85bd4f9d5d3171bd847b32be6038e5d551d089c8f230dfbf363898db630589f4", kill_on_drop: false }`
[INFO] [stdout] 85bd4f9d5d3171bd847b32be6038e5d551d089c8f230dfbf363898db630589f4