[INFO] cloning repository https://github.com/nbrendler/rust-breakout
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nbrendler/rust-breakout" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbrendler%2Frust-breakout", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnbrendler%2Frust-breakout'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fb27b6be31cdc7c076cf97c2aa325eac59f133c4
[INFO] testing nbrendler/rust-breakout 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%2Fnbrendler%2Frust-breakout" "/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/nbrendler/rust-breakout 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/nbrendler/rust-breakout
[INFO] finished tweaking git repo https://github.com/nbrendler/rust-breakout
[INFO] tweaked toml for git repo https://github.com/nbrendler/rust-breakout written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/nbrendler/rust-breakout 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded image v0.22.4
[INFO] [stderr]   Downloaded luminance-derive v0.5.2
[INFO] [stderr]   Downloaded luminance-glfw v0.12.0
[INFO] [stderr]   Downloaded luminance-windowing v0.8.1
[INFO] [stderr]   Downloaded glfw v0.34.0
[INFO] [stderr]   Downloaded luminance v0.38.0
[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" "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] cb77b65657ab6e5ca4ef6d77dd3c3b174d12010ce852a2167b8d63d9da09572e
[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" "cb77b65657ab6e5ca4ef6d77dd3c3b174d12010ce852a2167b8d63d9da09572e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb77b65657ab6e5ca4ef6d77dd3c3b174d12010ce852a2167b8d63d9da09572e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb77b65657ab6e5ca4ef6d77dd3c3b174d12010ce852a2167b8d63d9da09572e", kill_on_drop: false }`
[INFO] [stdout] cb77b65657ab6e5ca4ef6d77dd3c3b174d12010ce852a2167b8d63d9da09572e
[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] 19bc4e9dea21d908647b24acfe850dfd21dc5f927ea6daa27680802f3c3d7549
[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" "19bc4e9dea21d908647b24acfe850dfd21dc5f927ea6daa27680802f3c3d7549", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling cgmath v0.17.0
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]    Compiling gl v0.14.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling png v0.15.3
[INFO] [stderr]    Compiling tiff v0.3.1
[INFO] [stderr]    Compiling hibitset v0.6.2
[INFO] [stderr]    Compiling jpeg-decoder v0.1.18
[INFO] [stderr]    Compiling glfw-sys v3.3.2
[INFO] [stderr]    Compiling image v0.22.4
[INFO] [stderr]    Compiling glfw v0.34.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling luminance-derive v0.5.2
[INFO] [stderr]    Compiling luminance v0.38.0
[INFO] [stderr]    Compiling const-random-macro v0.1.8
[INFO] [stderr]    Compiling const-random v0.1.8
[INFO] [stderr]    Compiling ahash v0.2.18
[INFO] [stderr]    Compiling luminance-windowing v0.8.1
[INFO] [stderr]    Compiling luminance-glfw v0.12.0
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]    Compiling shred v0.9.4
[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/shred-0.9.4/src/lib.rs:54:34
[INFO] [stdout]    |
[INFO] [stdout] 54 | #![cfg_attr(feature = "nightly", feature(core_intrinsics))]
[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 `shred`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "19bc4e9dea21d908647b24acfe850dfd21dc5f927ea6daa27680802f3c3d7549", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19bc4e9dea21d908647b24acfe850dfd21dc5f927ea6daa27680802f3c3d7549", kill_on_drop: false }`
[INFO] [stdout] 19bc4e9dea21d908647b24acfe850dfd21dc5f927ea6daa27680802f3c3d7549