[INFO] fetching crate imgcat 0.1.0...
[INFO] documenting imgcat-0.1.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate imgcat 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate imgcat 0.1.0 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate imgcat 0.1.0
[INFO] finished tweaking crates.io crate imgcat 0.1.0
[INFO] tweaked toml for crates.io crate imgcat 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate imgcat 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5a7f1f36f3bbe55c7c2eab11922121682a5abf6fba174cb2919dcc19750a1b9d
[INFO] running `Command { std: "docker" "start" "-a" "5a7f1f36f3bbe55c7c2eab11922121682a5abf6fba174cb2919dcc19750a1b9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a7f1f36f3bbe55c7c2eab11922121682a5abf6fba174cb2919dcc19750a1b9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a7f1f36f3bbe55c7c2eab11922121682a5abf6fba174cb2919dcc19750a1b9d", kill_on_drop: false }`
[INFO] [stdout] 5a7f1f36f3bbe55c7c2eab11922121682a5abf6fba174cb2919dcc19750a1b9d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "RUSTDOCFLAGS=--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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 216cf241e21c4304fc52dfbf99aa181f3f7e71dfd55396bb81441f019fa807da
[INFO] running `Command { std: "docker" "start" "-a" "216cf241e21c4304fc52dfbf99aa181f3f7e71dfd55396bb81441f019fa807da", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]    Compiling structopt-derive v0.3.5
[INFO] [stderr]     Checking structopt v0.3.5
[INFO] [stderr]  Documenting imgcat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: environment variable `TERM` not defined
[INFO] [stdout]   --> src/main.rs:47:19
[INFO] [stdout]    |
[INFO] [stdout] 47 |     let is_tmux = env!("TERM").starts_with("screen");
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `env` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `imgcat`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name imgcat src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=900323bb6ac20788 -L dependency=/opt/rustwide/target/debug/deps --extern base64=/opt/rustwide/target/debug/deps/libbase64-8f213d801c8b1621.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-6071219bedca6fa3.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "216cf241e21c4304fc52dfbf99aa181f3f7e71dfd55396bb81441f019fa807da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "216cf241e21c4304fc52dfbf99aa181f3f7e71dfd55396bb81441f019fa807da", kill_on_drop: false }`
[INFO] [stdout] 216cf241e21c4304fc52dfbf99aa181f3f7e71dfd55396bb81441f019fa807da