[INFO] cloning repository https://github.com/lindorffs/NexusOS
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lindorffs/NexusOS" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flindorffs%2FNexusOS", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flindorffs%2FNexusOS'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bf54df243c37d09b985aceab31f4b7c38bca5463
[INFO] testing lindorffs/NexusOS against 1.98.0-beta.8+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flindorffs%2FNexusOS" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/lindorffs/NexusOS
[INFO] finished tweaking git repo https://github.com/lindorffs/NexusOS
[INFO] tweaked toml for git repo https://github.com/lindorffs/NexusOS written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/lindorffs/NexusOS on toolchain 1.98.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.98.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/lindorffs/NexusOS 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" "+1.98.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: build
[INFO] [stderr] help: build is a valid .cargo/config.toml key
[INFO] [stderr] warning: Cargo.toml: unused manifest key: target.x86_64-unknown-none.rustflags
[INFO] [stderr] warning: `nexus_os` (manifest) generated 2 warnings
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded xmas-elf v0.9.1
[INFO] [stderr]   Downloaded volatile v0.4.6
[INFO] [stderr]   Downloaded pic8259 v0.10.4
[INFO] [stderr]   Downloaded zero v0.1.3
[INFO] [stderr]   Downloaded x86_64 v0.14.13
[INFO] [stderr]   Downloaded pc-keyboard v0.7.0
[INFO] [stderr]   Downloaded spinning_top v0.2.5
[INFO] [stderr]   Downloaded font8x8 v0.3.1
[INFO] [stderr]   Downloaded bootloader v0.9.34
[INFO] [stderr]   Downloaded linked_list_allocator v0.10.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f
[INFO] running `Command { std: "docker" "start" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f", 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" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f", 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" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: unused manifest key: build
[INFO] [stderr] help: build is a valid .cargo/config.toml key
[INFO] [stderr] warning: Cargo.toml: unused manifest key: target.x86_64-unknown-none.rustflags
[INFO] [stderr] warning: `nexus_os` (manifest) generated 2 warnings
[INFO] [stderr]    Compiling bootloader v0.9.34
[INFO] [stderr]    Compiling bit_field v0.10.3
[INFO] [stderr]    Compiling volatile v0.4.6
[INFO] [stderr]    Compiling zero v0.1.3
[INFO] [stderr]    Compiling pc-keyboard v0.7.0
[INFO] [stderr]    Compiling font8x8 v0.3.1
[INFO] [stderr]    Compiling spin v0.9.8
[INFO] [stderr]    Compiling spinning_top v0.2.5
[INFO] [stderr]    Compiling xmas-elf v0.9.1
[INFO] [stderr]    Compiling linked_list_allocator v0.10.6
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling x86_64 v0.14.13
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/x86_64-0.14.13/src/lib.rs:5:35
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "const_fn", feature(const_mut_refs))] // GDT add_entry()
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `const_mut_refs` has been stable since `1.83.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `x86_64` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f", kill_on_drop: false }`
[INFO] [stdout] b72af6735c7d51d117101f8b3d20383205e1afb590506dfe4cce720adb1a869f
