[INFO] cloning repository https://github.com/genya0407/fake_dns
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/genya0407/fake_dns" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenya0407%2Ffake_dns", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenya0407%2Ffake_dns'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b745abbfe989e9f1cb821f1cd903c308a81dedc7
[INFO] testing genya0407/fake_dns against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgenya0407%2Ffake_dns" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/genya0407/fake_dns 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] started tweaking git repo https://github.com/genya0407/fake_dns
[INFO] finished tweaking git repo https://github.com/genya0407/fake_dns
[INFO] tweaked toml for git repo https://github.com/genya0407/fake_dns written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/genya0407/fake_dns 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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] e0c9e202654e6598c0f392d22b9c9ce7f3b91bf327a3d096df8e317bca44938e
[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" "e0c9e202654e6598c0f392d22b9c9ce7f3b91bf327a3d096df8e317bca44938e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e0c9e202654e6598c0f392d22b9c9ce7f3b91bf327a3d096df8e317bca44938e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0c9e202654e6598c0f392d22b9c9ce7f3b91bf327a3d096df8e317bca44938e", kill_on_drop: false }`
[INFO] [stdout] e0c9e202654e6598c0f392d22b9c9ce7f3b91bf327a3d096df8e317bca44938e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] e9b557a6841df5de303b594da8b65d2779904e4ae36b8a32cdc86f4f0a9caf17
[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" "e9b557a6841df5de303b594da8b65d2779904e4ae36b8a32cdc86f4f0a9caf17", kill_on_drop: false }`
[INFO] [stderr]    Compiling regex v0.2.10
[INFO] [stderr]    Compiling pnet_base v0.21.0
[INFO] [stderr]    Compiling pnet v0.21.0
[INFO] [stderr]    Compiling ipnetwork v0.12.8
[INFO] [stderr]    Compiling pcap v0.7.0
[INFO] [stderr]    Compiling hex-slice v0.1.4
[INFO] [stderr]    Compiling string-error v0.1.0
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling pnet_sys v0.21.0
[INFO] [stderr]    Compiling syntex_pos v0.42.0
[INFO] [stderr]    Compiling regex-syntax v0.5.3
[INFO] [stderr]    Compiling pnet_macros_support v0.21.0
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling pnet_datalink v0.21.0
[INFO] [stderr]    Compiling syntex_errors v0.42.0
[INFO] [stderr]    Compiling syntex_syntax v0.42.0
[INFO] [stderr]    Compiling syntex v0.42.2
[INFO] [stderr]    Compiling pnet_macros v0.21.0
[INFO] [stderr]    Compiling pnet_packet v0.21.0
[INFO] [stderr]    Compiling pnet_transport v0.21.0
[INFO] [stderr]    Compiling fake_dns v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::slice::SliceConcatExt`
[INFO] [stdout]  --> src/dns/message.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::slice::SliceConcatExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ no `SliceConcatExt` in `slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_concat_ext)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(inclusive_range_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fake_dns`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e9b557a6841df5de303b594da8b65d2779904e4ae36b8a32cdc86f4f0a9caf17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9b557a6841df5de303b594da8b65d2779904e4ae36b8a32cdc86f4f0a9caf17", kill_on_drop: false }`
[INFO] [stdout] e9b557a6841df5de303b594da8b65d2779904e4ae36b8a32cdc86f4f0a9caf17