[INFO] cloning repository https://github.com/QuietMisdreavus/rust-docbot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/QuietMisdreavus/rust-docbot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuietMisdreavus%2Frust-docbot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQuietMisdreavus%2Frust-docbot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 409b9c15c5deb887739e49ec9dcfa53ed76a38b8
[INFO] testing QuietMisdreavus/rust-docbot 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%2FQuietMisdreavus%2Frust-docbot" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/QuietMisdreavus/rust-docbot 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] started tweaking git repo https://github.com/QuietMisdreavus/rust-docbot
[INFO] finished tweaking git repo https://github.com/QuietMisdreavus/rust-docbot
[INFO] tweaked toml for git repo https://github.com/QuietMisdreavus/rust-docbot written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/QuietMisdreavus/rust-docbot 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]  Downloading crates ...
[INFO] [stderr]   Downloaded quote v0.2.3
[INFO] [stderr]   Downloaded syn v0.8.7
[INFO] [stderr]   Downloaded rls-span v0.4.0
[INFO] [stderr]   Downloaded derive-new v0.3.0
[INFO] [stderr]   Downloaded rls-data v0.10.0
[INFO] [stderr]   Downloaded rls-analysis v0.6.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 646def8119762f761d1e3ab1748d7191b5d403b37fec0fb5c7539bce05ae806e
[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" "646def8119762f761d1e3ab1748d7191b5d403b37fec0fb5c7539bce05ae806e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "646def8119762f761d1e3ab1748d7191b5d403b37fec0fb5c7539bce05ae806e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "646def8119762f761d1e3ab1748d7191b5d403b37fec0fb5c7539bce05ae806e", kill_on_drop: false }`
[INFO] [stdout] 646def8119762f761d1e3ab1748d7191b5d403b37fec0fb5c7539bce05ae806e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 3fb7a6f1b1bf215d496316b686f9b9a024d0f036d303f2fbd82aaa787db71766
[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" "3fb7a6f1b1bf215d496316b686f9b9a024d0f036d303f2fbd82aaa787db71766", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling quote v0.2.3
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling openssl-sys v0.7.17
[INFO] [stderr]    Compiling rls-span v0.4.0
[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/rls-span-0.4.0/src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling syn v0.8.7
[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 `rls-span`
[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" "3fb7a6f1b1bf215d496316b686f9b9a024d0f036d303f2fbd82aaa787db71766", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fb7a6f1b1bf215d496316b686f9b9a024d0f036d303f2fbd82aaa787db71766", kill_on_drop: false }`
[INFO] [stdout] 3fb7a6f1b1bf215d496316b686f9b9a024d0f036d303f2fbd82aaa787db71766