[INFO] fetching crate termrect 0.1.2...
[INFO] documenting termrect-0.1.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate termrect 0.1.2 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate termrect 0.1.2 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 crates.io crate termrect 0.1.2
[INFO] finished tweaking crates.io crate termrect 0.1.2
[INFO] tweaked toml for crates.io crate termrect 0.1.2 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 7b1abdee26c1784ed0ae24020f21f3e997c7b13413a6ed5b0c22471dd3cb9024
[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" "7b1abdee26c1784ed0ae24020f21f3e997c7b13413a6ed5b0c22471dd3cb9024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b1abdee26c1784ed0ae24020f21f3e997c7b13413a6ed5b0c22471dd3cb9024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b1abdee26c1784ed0ae24020f21f3e997c7b13413a6ed5b0c22471dd3cb9024", kill_on_drop: false }`
[INFO] [stdout] 7b1abdee26c1784ed0ae24020f21f3e997c7b13413a6ed5b0c22471dd3cb9024
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 63442408f831ea64ca79ba4b84813f9a754f0bc1157f5e332358f8fac03d2645
[INFO] running `Command { std: "docker" "start" "-a" "63442408f831ea64ca79ba4b84813f9a754f0bc1157f5e332358f8fac03d2645", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Documenting termrect v0.1.2 (/opt/rustwide/workdir)
[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(collections_range)]
[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 `termrect`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name termrect src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bitfield=/opt/rustwide/target/debug/deps/libbitfield-d2b56c0968a8a9b5.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-433d1b037a7098c7.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-fb1c5f8d2dd7d3bd.rmeta --extern unicode_width=/opt/rustwide/target/debug/deps/libunicode_width-739dfd89b440ae34.rmeta --cap-lints=warn --crate-version 0.1.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "63442408f831ea64ca79ba4b84813f9a754f0bc1157f5e332358f8fac03d2645", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63442408f831ea64ca79ba4b84813f9a754f0bc1157f5e332358f8fac03d2645", kill_on_drop: false }`
[INFO] [stdout] 63442408f831ea64ca79ba4b84813f9a754f0bc1157f5e332358f8fac03d2645