[INFO] cloning repository https://github.com/urbanslug/pdf-analyzer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/urbanslug/pdf-analyzer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Furbanslug%2Fpdf-analyzer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Furbanslug%2Fpdf-analyzer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2c222e7f50b79e84a3f396f7875d5ac0ec8940af
[INFO] documenting urbanslug/pdf-analyzer against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Furbanslug%2Fpdf-analyzer" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/urbanslug/pdf-analyzer on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/urbanslug/pdf-analyzer
[INFO] finished tweaking git repo https://github.com/urbanslug/pdf-analyzer
[INFO] tweaked toml for git repo https://github.com/urbanslug/pdf-analyzer written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/urbanslug/pdf-analyzer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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 tuple v0.4.2
[INFO] [stderr]   Downloaded adobe-cmap-parser v0.3.3
[INFO] [stderr]   Downloaded type1-encoding-parser v0.1.0
[INFO] [stderr]   Downloaded pdf_derive v0.1.17
[INFO] [stderr]   Downloaded euclid v0.15.6
[INFO] [stderr]   Downloaded postscript v0.11.1
[INFO] [stderr]   Downloaded pdf-extract v0.6.1
[INFO] [stderr]   Downloaded pdf v0.6.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 87ce809ad2b9a17e8759eaa9e1de45e7d2689c328c8417a5088316d86f28b2da
[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" "87ce809ad2b9a17e8759eaa9e1de45e7d2689c328c8417a5088316d86f28b2da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "87ce809ad2b9a17e8759eaa9e1de45e7d2689c328c8417a5088316d86f28b2da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87ce809ad2b9a17e8759eaa9e1de45e7d2689c328c8417a5088316d86f28b2da", kill_on_drop: false }`
[INFO] [stdout] 87ce809ad2b9a17e8759eaa9e1de45e7d2689c328c8417a5088316d86f28b2da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 679d68cf214bce9827f29919bccfc9afa170481dd4bc0da0dd3305875edbfc2a
[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" "679d68cf214bce9827f29919bccfc9afa170481dd4bc0da0dd3305875edbfc2a", kill_on_drop: false }`
[INFO] [stderr]     Checking pom v1.1.0
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking pom v3.0.2
[INFO] [stderr]     Checking postscript v0.11.1
[INFO] [stderr]    Compiling num-traits v0.2.9
[INFO] [stderr]     Checking itertools v0.6.5
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking memmap v0.5.2
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]    Compiling pdf_derive v0.1.17
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]     Checking rayon-core v1.6.0
[INFO] [stderr]     Checking adobe-cmap-parser v0.3.3
[INFO] [stderr]     Checking type1-encoding-parser v0.1.0
[INFO] [stderr]     Checking rayon v1.2.0
[INFO] [stderr]     Checking num-integer v0.1.41
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking tuple v0.4.2
[INFO] [stderr]     Checking euclid v0.15.6
[INFO] [stderr]     Checking num-iter v0.1.39
[INFO] [stderr]     Checking chrono v0.4.9
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking lopdf v0.23.0
[INFO] [stderr]     Checking pdf-extract v0.6.1
[INFO] [stderr]     Checking pdf v0.6.3
[INFO] [stderr]  Documenting analyzer v0.1.0 (/opt/rustwide/workdir)
[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(pattern)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[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] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `analyzer`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name analyzer src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern getopts=/opt/rustwide/target/debug/deps/libgetopts-2300e3116d2d681b.rmeta --extern lopdf=/opt/rustwide/target/debug/deps/liblopdf-6f10a9fb7d01f96a.rmeta --extern pdf=/opt/rustwide/target/debug/deps/libpdf-6b9401cd8d2799ef.rmeta --extern pdf_extract=/opt/rustwide/target/debug/deps/libpdf_extract-bf22c542e3f44cc1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "679d68cf214bce9827f29919bccfc9afa170481dd4bc0da0dd3305875edbfc2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "679d68cf214bce9827f29919bccfc9afa170481dd4bc0da0dd3305875edbfc2a", kill_on_drop: false }`
[INFO] [stdout] 679d68cf214bce9827f29919bccfc9afa170481dd4bc0da0dd3305875edbfc2a