[INFO] cloning repository https://github.com/hmvp/rust_poc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hmvp/rust_poc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmvp%2Frust_poc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmvp%2Frust_poc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 833b420924dfd02ef23571f1a49c7033c3886a88
[INFO] documenting hmvp/rust_poc against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhmvp%2Frust_poc" "/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/hmvp/rust_poc on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6/source/.cargo/config
[INFO] started tweaking git repo https://github.com/hmvp/rust_poc
[INFO] finished tweaking git repo https://github.com/hmvp/rust_poc
[INFO] tweaked toml for git repo https://github.com/hmvp/rust_poc written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/hmvp/rust_poc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cortex-m-semihosting v0.1.3
[INFO] [stderr]   Downloaded cortex-m v0.2.6
[INFO] [stderr]   Downloaded cortex-m-rt v0.2.1
[INFO] [stderr]   Downloaded r0 v0.2.1
[INFO] [stderr]   Downloaded static-ref v0.1.0
[INFO] [stderr]   Downloaded cortex-m-rtfm v0.1.0
[INFO] [stderr]   Downloaded typenum v1.8.0
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1b0631d8ce0c881ae60a90926aa62903b2813d0de435f293c698755bc2c0d53
[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" "b1b0631d8ce0c881ae60a90926aa62903b2813d0de435f293c698755bc2c0d53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1b0631d8ce0c881ae60a90926aa62903b2813d0de435f293c698755bc2c0d53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1b0631d8ce0c881ae60a90926aa62903b2813d0de435f293c698755bc2c0d53", kill_on_drop: false }`
[INFO] [stdout] b1b0631d8ce0c881ae60a90926aa62903b2813d0de435f293c698755bc2c0d53
[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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb159256baf6d0d469915b48df2d88b5b7e371c4ac06779b3ba1048240d7e0bd
[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" "bb159256baf6d0d469915b48df2d88b5b7e371c4ac06779b3ba1048240d7e0bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling cortex-m v0.2.6
[INFO] [stderr]     Checking vcell v0.1.0
[INFO] [stderr]     Checking cortex-m-semihosting v0.1.3
[INFO] [stderr]    Compiling typenum v1.8.0
[INFO] [stderr]    Compiling cortex-m-rt v0.2.1
[INFO] [stderr]    Compiling rust_poc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking r0 v0.2.1
[INFO] [stderr]     Checking static-ref v0.1.0
[INFO] [stderr]     Checking cast v0.2.2
[INFO] [stderr]    Compiling syn v0.11.11
[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:105:12
[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` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "bb159256baf6d0d469915b48df2d88b5b7e371c4ac06779b3ba1048240d7e0bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb159256baf6d0d469915b48df2d88b5b7e371c4ac06779b3ba1048240d7e0bd", kill_on_drop: false }`
[INFO] [stdout] bb159256baf6d0d469915b48df2d88b5b7e371c4ac06779b3ba1048240d7e0bd