[INFO] cloning repository https://github.com/smbolton/stm32f3-oscilloscope
[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-oscilloscope" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-oscilloscope", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-oscilloscope'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 06443bfa64375d1f576aa297186e88d31dc284a6
[INFO] testing smbolton/stm32f3-oscilloscope against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmbolton%2Fstm32f3-oscilloscope" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/smbolton/stm32f3-oscilloscope on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1/source/.cargo/config
[INFO] started tweaking git repo https://github.com/smbolton/stm32f3-oscilloscope
[INFO] finished tweaking git repo https://github.com/smbolton/stm32f3-oscilloscope
[INFO] tweaked toml for git repo https://github.com/smbolton/stm32f3-oscilloscope written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/smbolton/stm32f3-oscilloscope already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 86c1c3ecbf2942710c604c6fdad5cf22e30bf6bc5f77432dfc71fdc340964dcb
[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" "86c1c3ecbf2942710c604c6fdad5cf22e30bf6bc5f77432dfc71fdc340964dcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86c1c3ecbf2942710c604c6fdad5cf22e30bf6bc5f77432dfc71fdc340964dcb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86c1c3ecbf2942710c604c6fdad5cf22e30bf6bc5f77432dfc71fdc340964dcb", kill_on_drop: false }`
[INFO] [stdout] 86c1c3ecbf2942710c604c6fdad5cf22e30bf6bc5f77432dfc71fdc340964dcb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb4b6c3ba366a48b70f95f5545569885255cbed7ee72f62ca3ab5b08e0076fda
[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" "bb4b6c3ba366a48b70f95f5545569885255cbed7ee72f62ca3ab5b08e0076fda", kill_on_drop: false }`
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling cortex-m v0.2.11
[INFO] [stderr]    Compiling aligned v0.1.1
[INFO] [stderr]    Compiling cortex-m-semihosting v0.1.3
[INFO] [stderr]    Compiling cortex-m-rt v0.2.5
[INFO] [stderr]    Compiling gcc v0.3.51
[INFO] [stderr]    Compiling r0 v0.2.1
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable 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 stable 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" "bb4b6c3ba366a48b70f95f5545569885255cbed7ee72f62ca3ab5b08e0076fda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb4b6c3ba366a48b70f95f5545569885255cbed7ee72f62ca3ab5b08e0076fda", kill_on_drop: false }`
[INFO] [stdout] bb4b6c3ba366a48b70f95f5545569885255cbed7ee72f62ca3ab5b08e0076fda