[INFO] cloning repository https://github.com/matthiaskrgr/cargo-rebuild-check
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/matthiaskrgr/cargo-rebuild-check" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatthiaskrgr%2Fcargo-rebuild-check", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatthiaskrgr%2Fcargo-rebuild-check'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d54fa01899ab0b14fd29fa0e585e8b1bad9bfefa
[INFO] testing matthiaskrgr/cargo-rebuild-check 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%2Fmatthiaskrgr%2Fcargo-rebuild-check" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matthiaskrgr/cargo-rebuild-check 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/matthiaskrgr/cargo-rebuild-check
[INFO] finished tweaking git repo https://github.com/matthiaskrgr/cargo-rebuild-check
[INFO] tweaked toml for git repo https://github.com/matthiaskrgr/cargo-rebuild-check written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/matthiaskrgr/cargo-rebuild-check 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] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded commoncrypto-sys v0.2.0
[INFO] [stderr]   Downloaded commoncrypto v0.2.0
[INFO] [stderr]   Downloaded quote v0.6.3
[INFO] [stderr]   Downloaded rand v0.5.4
[INFO] [stderr]   Downloaded home v0.3.3
[INFO] [stderr]   Downloaded regex-syntax v0.6.2
[INFO] [stderr]   Downloaded lazy_static v1.0.2
[INFO] [stderr]   Downloaded globset v0.4.0
[INFO] [stderr]   Downloaded git2 v0.7.2
[INFO] [stderr]   Downloaded schannel v0.1.13
[INFO] [stderr]   Downloaded miow v0.3.1
[INFO] [stderr]   Downloaded jobserver v0.1.11
[INFO] [stderr]   Downloaded proc-macro2 v0.4.8
[INFO] [stderr]   Downloaded cmake v0.1.31
[INFO] [stderr]   Downloaded crypto-hash v0.3.1
[INFO] [stderr]   Downloaded filetime v0.2.1
[INFO] [stderr]   Downloaded ignore v0.4.2
[INFO] [stderr]   Downloaded serde_ignored v0.0.4
[INFO] [stderr]   Downloaded curl v0.4.12
[INFO] [stderr]   Downloaded rand_core v0.2.1
[INFO] [stderr]   Downloaded git2-curl v0.8.1
[INFO] [stderr]   Downloaded openssl v0.10.10
[INFO] [stderr]   Downloaded curl-sys v0.4.6
[INFO] [stderr]   Downloaded libz-sys v1.0.18
[INFO] [stderr]   Downloaded shell-escape v0.1.4
[INFO] [stderr]   Downloaded crates-io v0.16.0
[INFO] [stderr]   Downloaded tar v0.4.16
[INFO] [stderr]   Downloaded openssl-sys v0.9.33
[INFO] [stderr]   Downloaded socket2 v0.3.7
[INFO] [stderr]   Downloaded tempfile v3.0.3
[INFO] [stderr]   Downloaded syn v0.14.4
[INFO] [stderr]   Downloaded libssh2-sys v0.2.8
[INFO] [stderr]   Downloaded libgit2-sys v0.7.5
[INFO] [stderr]   Downloaded cargo v0.28.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 5a972b59ba91fc5185df1970947624e3b42aca8eba79a58836b0e695f77d576e
[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" "5a972b59ba91fc5185df1970947624e3b42aca8eba79a58836b0e695f77d576e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a972b59ba91fc5185df1970947624e3b42aca8eba79a58836b0e695f77d576e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a972b59ba91fc5185df1970947624e3b42aca8eba79a58836b0e695f77d576e", kill_on_drop: false }`
[INFO] [stdout] 5a972b59ba91fc5185df1970947624e3b42aca8eba79a58836b0e695f77d576e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 506a130b5ef6bdeb4637866da8f4779577914af67fe854138c2c07add4e6dd0c
[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" "506a130b5ef6bdeb4637866da8f4779577914af67fe854138c2c07add4e6dd0c", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling pkg-config v0.3.12
[INFO] [stderr]    Compiling openssl v0.10.10
[INFO] [stderr]    Compiling crossbeam v0.3.2
[INFO] [stderr]    Compiling shell-escape v0.1.4
[INFO] [stderr]    Compiling home v0.3.3
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling cmake v0.1.31
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stderr]    Compiling proc-macro2 v0.4.8
[INFO] [stderr]    Compiling socket2 v0.3.7
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling filetime v0.2.1
[INFO] [stderr]    Compiling rand v0.5.4
[INFO] [stderr]    Compiling walkdir v2.1.4
[INFO] [stderr]    Compiling jobserver v0.1.11
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling serde_ignored v0.0.4
[INFO] [stderr]    Compiling regex v1.0.2
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling tar v0.4.16
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling flate2 v1.0.1
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling ignore v0.4.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling openssl-sys v0.9.33
[INFO] [stderr]    Compiling libz-sys v1.0.18
[INFO] [stderr]    Compiling curl-sys v0.4.6
[INFO] [stderr]    Compiling libssh2-sys v0.2.8
[INFO] [stderr]    Compiling libgit2-sys v0.7.5
[INFO] [stderr]    Compiling syn v0.14.4
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling tempfile v3.0.3
[INFO] [stderr]    Compiling backtrace v0.3.9
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]    Compiling env_logger v0.5.10
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]    Compiling crypto-hash v0.3.1
[INFO] [stderr]    Compiling curl v0.4.12
[INFO] [stderr]    Compiling crates-io v0.16.0
[INFO] [stderr]    Compiling git2 v0.7.2
[INFO] [stderr]    Compiling git2-curl v0.8.1
[INFO] [stderr]    Compiling cargo v0.28.0
[INFO] [stderr]    Compiling cargo-rebuild-check v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning[E0705]: the feature `rust_2018_preview` is included in the Rust 2018 edition
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(rust_2018_preview, use_extern_macros)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(rust_2018_preview, use_extern_macros)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0705.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cargo-rebuild-check`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "506a130b5ef6bdeb4637866da8f4779577914af67fe854138c2c07add4e6dd0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "506a130b5ef6bdeb4637866da8f4779577914af67fe854138c2c07add4e6dd0c", kill_on_drop: false }`
[INFO] [stdout] 506a130b5ef6bdeb4637866da8f4779577914af67fe854138c2c07add4e6dd0c