[INFO] cloning repository https://github.com/oresat/syscon-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/oresat/syscon-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foresat%2Fsyscon-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foresat%2Fsyscon-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 090ba537422d55f11529348b6dbc3399fa9dd50f
[INFO] testing oresat/syscon-rs 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%2Foresat%2Fsyscon-rs" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/oresat/syscon-rs 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-6/source/.cargo/config
[INFO] started tweaking git repo https://github.com/oresat/syscon-rs
[INFO] finished tweaking git repo https://github.com/oresat/syscon-rs
[INFO] tweaked toml for git repo https://github.com/oresat/syscon-rs written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/oresat/syscon-rs 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]     Updating git repository `https://github.com/oresat/stm32f411xx-rs.git`
[INFO] [stderr]     Updating git repository `https://github.com/oresat/stm32f446xx-rs.git`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded vcell v0.1.0
[INFO] [stderr]   Downloaded cast v0.2.2
[INFO] [stderr]   Downloaded cortex-m-semihosting v0.1.3
[INFO] [stderr]   Downloaded cortex-m-rt v0.2.1
[INFO] [stderr]   Downloaded r0 v0.2.1
[INFO] [stderr]   Downloaded cortex-m v0.2.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8e141ea9ac3da715ac86bba853877233bc09d0bd3582f54acfb25ab5849cde77
[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" "8e141ea9ac3da715ac86bba853877233bc09d0bd3582f54acfb25ab5849cde77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e141ea9ac3da715ac86bba853877233bc09d0bd3582f54acfb25ab5849cde77", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e141ea9ac3da715ac86bba853877233bc09d0bd3582f54acfb25ab5849cde77", kill_on_drop: false }`
[INFO] [stdout] 8e141ea9ac3da715ac86bba853877233bc09d0bd3582f54acfb25ab5849cde77
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c21c4baa8c138d10251642c62b5dbc3e7a2f178837cff2396a9da32d370e33fc
[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" "c21c4baa8c138d10251642c62b5dbc3e7a2f178837cff2396a9da32d370e33fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.2.6
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling cortex-m-semihosting v0.1.3
[INFO] [stderr]    Compiling cortex-m-rt v0.2.1
[INFO] [stderr]    Compiling oresat-syscon v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling r0 v0.2.1
[INFO] [stderr]    Compiling cast v0.2.2
[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/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] [stderr]    Compiling 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 `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] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c21c4baa8c138d10251642c62b5dbc3e7a2f178837cff2396a9da32d370e33fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c21c4baa8c138d10251642c62b5dbc3e7a2f178837cff2396a9da32d370e33fc", kill_on_drop: false }`
[INFO] [stdout] c21c4baa8c138d10251642c62b5dbc3e7a2f178837cff2396a9da32d370e33fc