[INFO] cloning repository https://github.com/ansaritariq/akasma_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ansaritariq/akasma_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fansaritariq%2Fakasma_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fansaritariq%2Fakasma_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab33a109697bc59da19b46c7e6740542796b3a20
[INFO] testing ansaritariq/akasma_os against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fansaritariq%2Fakasma_os" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ansaritariq/akasma_os on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config
[INFO] started tweaking git repo https://github.com/ansaritariq/akasma_os
[INFO] finished tweaking git repo https://github.com/ansaritariq/akasma_os
[INFO] tweaked toml for git repo https://github.com/ansaritariq/akasma_os written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/ansaritariq/akasma_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bit_field v0.9.0
[INFO] [stderr]   Downloaded array-init v0.0.4
[INFO] [stderr]   Downloaded zero v0.1.2
[INFO] [stderr]   Downloaded nodrop v0.1.13
[INFO] [stderr]   Downloaded cast v0.2.2
[INFO] [stderr]   Downloaded bootloader v0.6.4
[INFO] [stderr]   Downloaded usize_conversions v0.2.0
[INFO] [stderr]   Downloaded bitflags v1.1.0
[INFO] [stderr]   Downloaded xmas-elf v0.6.2
[INFO] [stderr]   Downloaded llvm-tools v0.1.1
[INFO] [stderr]   Downloaded ux v0.1.3
[INFO] [stderr]   Downloaded fixedvec v0.2.4
[INFO] [stderr]   Downloaded x86_64 v0.7.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c1fbc86e8b271438aee645edc9f3372e8145d7e7c48b2b625673d24c2d758842
[INFO] running `Command { std: "docker" "start" "-a" "c1fbc86e8b271438aee645edc9f3372e8145d7e7c48b2b625673d24c2d758842", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1fbc86e8b271438aee645edc9f3372e8145d7e7c48b2b625673d24c2d758842", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1fbc86e8b271438aee645edc9f3372e8145d7e7c48b2b625673d24c2d758842", kill_on_drop: false }`
[INFO] [stdout] c1fbc86e8b271438aee645edc9f3372e8145d7e7c48b2b625673d24c2d758842
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b76148be9d2b0903961faa9054855a6165572641701e80f17dc7ddc9d217efd3
[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" "b76148be9d2b0903961faa9054855a6165572641701e80f17dc7ddc9d217efd3", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling llvm-tools v0.1.1
[INFO] [stderr]    Compiling zero v0.1.2
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling cast v0.2.2
[INFO] [stderr]    Compiling ux v0.1.3
[INFO] [stderr]    Compiling usize_conversions v0.2.0
[INFO] [stderr]    Compiling fixedvec v0.2.4
[INFO] [stderr]    Compiling xmas-elf v0.6.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/usize_conversions-0.2.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(i128_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `usize_conversions`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b76148be9d2b0903961faa9054855a6165572641701e80f17dc7ddc9d217efd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b76148be9d2b0903961faa9054855a6165572641701e80f17dc7ddc9d217efd3", kill_on_drop: false }`
[INFO] [stdout] b76148be9d2b0903961faa9054855a6165572641701e80f17dc7ddc9d217efd3