[INFO] cloning repository https://github.com/dns2utf8/rustdoc_demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dns2utf8/rustdoc_demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdns2utf8%2Frustdoc_demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdns2utf8%2Frustdoc_demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f7a03948e0c587e8abbb31dbc44101b3d78041ce
[INFO] testing dns2utf8/rustdoc_demo against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdns2utf8%2Frustdoc_demo" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dns2utf8/rustdoc_demo on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dns2utf8/rustdoc_demo
[INFO] finished tweaking git repo https://github.com/dns2utf8/rustdoc_demo
[INFO] tweaked toml for git repo https://github.com/dns2utf8/rustdoc_demo written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/dns2utf8/rustdoc_demo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sudo v0.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3faace3ccbefb05e4b6d9320759f2ef622a1a0e5886e6a03d4ad583c34f94944
[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" "3faace3ccbefb05e4b6d9320759f2ef622a1a0e5886e6a03d4ad583c34f94944", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3faace3ccbefb05e4b6d9320759f2ef622a1a0e5886e6a03d4ad583c34f94944", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3faace3ccbefb05e4b6d9320759f2ef622a1a0e5886e6a03d4ad583c34f94944", kill_on_drop: false }`
[INFO] [stdout] 3faace3ccbefb05e4b6d9320759f2ef622a1a0e5886e6a03d4ad583c34f94944
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9cff3ad3937e0e637a0b68c3af78ed582cb42be838c35196b5e15e38c80b24b8
[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" "9cff3ad3937e0e637a0b68c3af78ed582cb42be838c35196b5e15e38c80b24b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudo v0.6.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling rustdoc_demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `content`
[INFO] [stdout]   --> src/mod1.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |         content::should::be::irrelevant();
[INFO] [stdout]    |         ^^^^^^^ use of undeclared crate or module `content`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(doc_cfg)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustdoc_demo` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "9cff3ad3937e0e637a0b68c3af78ed582cb42be838c35196b5e15e38c80b24b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cff3ad3937e0e637a0b68c3af78ed582cb42be838c35196b5e15e38c80b24b8", kill_on_drop: false }`
[INFO] [stdout] 9cff3ad3937e0e637a0b68c3af78ed582cb42be838c35196b5e15e38c80b24b8