[INFO] cloning repository https://github.com/VladTyzhnevyi/PCB-Debugging-Tests
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/VladTyzhnevyi/PCB-Debugging-Tests" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladTyzhnevyi%2FPCB-Debugging-Tests", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladTyzhnevyi%2FPCB-Debugging-Tests'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cd2370b0f8fd5318afb98c101d12cc929dbadaa8
[INFO] checking VladTyzhnevyi/PCB-Debugging-Tests against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FVladTyzhnevyi%2FPCB-Debugging-Tests" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/VladTyzhnevyi/PCB-Debugging-Tests 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-5/source/.cargo/config
[INFO] started tweaking git repo https://github.com/VladTyzhnevyi/PCB-Debugging-Tests
[INFO] finished tweaking git repo https://github.com/VladTyzhnevyi/PCB-Debugging-Tests
[INFO] tweaked toml for git repo https://github.com/VladTyzhnevyi/PCB-Debugging-Tests written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/VladTyzhnevyi/PCB-Debugging-Tests 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] cf85357961dd21c8956600c7835cb4538ab2a250919aa4b1b82ddd654e760aac
[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" "cf85357961dd21c8956600c7835cb4538ab2a250919aa4b1b82ddd654e760aac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf85357961dd21c8956600c7835cb4538ab2a250919aa4b1b82ddd654e760aac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf85357961dd21c8956600c7835cb4538ab2a250919aa4b1b82ddd654e760aac", kill_on_drop: false }`
[INFO] [stdout] cf85357961dd21c8956600c7835cb4538ab2a250919aa4b1b82ddd654e760aac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 8d1300f94380335a8492b4a912108ebed3d5a569fd202008ce3a0dcc40fce260
[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" "8d1300f94380335a8492b4a912108ebed3d5a569fd202008ce3a0dcc40fce260", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling cortex-m v0.6.2
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking vcell v0.1.2
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling cortex-m-rt v0.6.12
[INFO] [stderr]    Compiling cortex-m v0.5.10
[INFO] [stderr]     Checking aligned v0.2.0
[INFO] [stderr]    Compiling libm v0.1.4
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]    Compiling tm4c129x v0.8.0
[INFO] [stderr]     Checking managed v0.5.1
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking generic-array v0.12.3
[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/managed-0.5.1/src/lib.rs:3:30
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(feature = "map", feature(slice_rotate))]
[INFO] [stdout]   |                              ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]     Checking volatile-register v0.2.0
[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 `managed`
[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" "8d1300f94380335a8492b4a912108ebed3d5a569fd202008ce3a0dcc40fce260", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d1300f94380335a8492b4a912108ebed3d5a569fd202008ce3a0dcc40fce260", kill_on_drop: false }`
[INFO] [stdout] 8d1300f94380335a8492b4a912108ebed3d5a569fd202008ce3a0dcc40fce260