[INFO] cloning repository https://github.com/smbolton/stm32f3-got-mcve
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/smbolton/stm32f3-got-mcve" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-got-mcve", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-got-mcve'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 657e9528e89764eb3a15d5229f1afde2a70519d5
[INFO] checking smbolton/stm32f3-got-mcve against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-got-mcve" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/smbolton/stm32f3-got-mcve 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-4/source/.cargo/config
[INFO] started tweaking git repo https://github.com/smbolton/stm32f3-got-mcve
[INFO] finished tweaking git repo https://github.com/smbolton/stm32f3-got-mcve
[INFO] tweaked toml for git repo https://github.com/smbolton/stm32f3-got-mcve written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/smbolton/stm32f3-got-mcve 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 17da4512f4c30ccb2ae98ad38daa2acca5e9bee353526eba7dfee2734e4b4f94
[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" "17da4512f4c30ccb2ae98ad38daa2acca5e9bee353526eba7dfee2734e4b4f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17da4512f4c30ccb2ae98ad38daa2acca5e9bee353526eba7dfee2734e4b4f94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17da4512f4c30ccb2ae98ad38daa2acca5e9bee353526eba7dfee2734e4b4f94", kill_on_drop: false }`
[INFO] [stdout] 17da4512f4c30ccb2ae98ad38daa2acca5e9bee353526eba7dfee2734e4b4f94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 79f93f833c20c57e0429a05bd2fd1b9eedd814d29d1e2a182924b6766acb0a30
[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" "79f93f833c20c57e0429a05bd2fd1b9eedd814d29d1e2a182924b6766acb0a30", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.2.11
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]     Checking cortex-m-semihosting v0.1.3
[INFO] [stderr]     Checking aligned v0.1.1
[INFO] [stderr]    Compiling cortex-m-rt v0.2.5
[INFO] [stderr]     Checking r0 v0.2.1
[INFO] [stderr]    Compiling stm32f3-got-mcve v0.1.0 (/opt/rustwide/workdir)
[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-semihosting-0.1.3/src/lib.rs:105:1
[INFO] [stdout]     |
[INFO] [stdout] 105 | #![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-semihosting`
[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] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/aligned-0.1.1/src/lib.rs:32:1
[INFO] [stdout]    |
[INFO] [stdout] 32 | #![feature(const_fn)]
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "79f93f833c20c57e0429a05bd2fd1b9eedd814d29d1e2a182924b6766acb0a30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79f93f833c20c57e0429a05bd2fd1b9eedd814d29d1e2a182924b6766acb0a30", kill_on_drop: false }`
[INFO] [stdout] 79f93f833c20c57e0429a05bd2fd1b9eedd814d29d1e2a182924b6766acb0a30