[INFO] cloning repository https://github.com/AlbinMartinsson/E7020E_labs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AlbinMartinsson/E7020E_labs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlbinMartinsson%2FE7020E_labs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlbinMartinsson%2FE7020E_labs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c06967d0dabccffeb399f2d7acab78aa27320e48
[INFO] checking AlbinMartinsson/E7020E_labs against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAlbinMartinsson%2FE7020E_labs" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
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Checking out files: 100% (816/816), done.
[INFO] validating manifest of git repo https://github.com/AlbinMartinsson/E7020E_labs on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-9/source/.cargo/config
[INFO] started tweaking git repo https://github.com/AlbinMartinsson/E7020E_labs
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/AlbinMartinsson/E7020E_labs
[INFO] tweaked toml for git repo https://github.com/AlbinMartinsson/E7020E_labs written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/AlbinMartinsson/E7020E_labs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e88d6df98f26f77a279e5950f431a0a0ff02516e6a577ec00bd5277cf7003cdb
[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" "e88d6df98f26f77a279e5950f431a0a0ff02516e6a577ec00bd5277cf7003cdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e88d6df98f26f77a279e5950f431a0a0ff02516e6a577ec00bd5277cf7003cdb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e88d6df98f26f77a279e5950f431a0a0ff02516e6a577ec00bd5277cf7003cdb", kill_on_drop: false }`
[INFO] [stdout] e88d6df98f26f77a279e5950f431a0a0ff02516e6a577ec00bd5277cf7003cdb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd7811e17b89653450debd53b0f977fb5981506dab8463fe25fa01cfc6f05832
[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" "fd7811e17b89653450debd53b0f977fb5981506dab8463fe25fa01cfc6f05832", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.6.2
[INFO] [stderr]     Checking ufmt-write v0.1.0
[INFO] [stderr]     Checking nb v0.1.2
[INFO] [stderr]    Compiling ufmt-macros v0.1.1
[INFO] [stderr]     Checking cortex-m-rt v0.6.12
[INFO] [stderr]     Checking heapless v0.5.4
[INFO] [stderr]    Compiling cortex-m-semihosting v0.3.5
[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/cortex-m-0.6.2/src/lib.rs:32:37
[INFO] [stdout]    |
[INFO] [stdout] 32 | #![cfg_attr(feature = "inline-asm", feature(asm))]
[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 `cortex-m`
[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" "fd7811e17b89653450debd53b0f977fb5981506dab8463fe25fa01cfc6f05832", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd7811e17b89653450debd53b0f977fb5981506dab8463fe25fa01cfc6f05832", kill_on_drop: false }`
[INFO] [stdout] fd7811e17b89653450debd53b0f977fb5981506dab8463fe25fa01cfc6f05832