[INFO] cloning repository https://github.com/jdmichaud/b
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jdmichaud/b" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjdmichaud%2Fb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjdmichaud%2Fb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 58943923a4d13868d5df150f79eccb6e1108c5a8
[INFO] documenting jdmichaud/b 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%2Fjdmichaud%2Fb" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jdmichaud/b 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/jdmichaud/b
[INFO] finished tweaking git repo https://github.com/jdmichaud/b
[INFO] tweaked toml for git repo https://github.com/jdmichaud/b written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/jdmichaud/b 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 pancurses v0.16.1
[INFO] [stderr]   Downloaded pdcurses-sys v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 552b2354aac5ec63807a1f1e96efcb475fa7b795f93827fc50231f8523dde033
[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" "552b2354aac5ec63807a1f1e96efcb475fa7b795f93827fc50231f8523dde033", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "552b2354aac5ec63807a1f1e96efcb475fa7b795f93827fc50231f8523dde033", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "552b2354aac5ec63807a1f1e96efcb475fa7b795f93827fc50231f8523dde033", kill_on_drop: false }`
[INFO] [stdout] 552b2354aac5ec63807a1f1e96efcb475fa7b795f93827fc50231f8523dde033
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] ff4cc3f306b4791fa4dfa3a0b22ed0fdb6055e3613787a4aab5efb347dd32008
[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" "ff4cc3f306b4791fa4dfa3a0b22ed0fdb6055e3613787a4aab5efb347dd32008", kill_on_drop: false }`
[INFO] [stderr]     Checking ucd-util v0.1.7
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking utf8-ranges v1.0.4
[INFO] [stderr]    Compiling ncurses v5.99.0
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking simplelog v0.5.3
[INFO] [stderr]     Checking pancurses v0.16.1
[INFO] [stderr]  Documenting b 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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(path_ancestors)]
[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 `b`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name b 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 chrono=/opt/rustwide/target/debug/deps/libchrono-54d3472883eadb79.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-0543c33e1b112089.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-69d9a7f018cb28c7.rmeta --extern ncurses=/opt/rustwide/target/debug/deps/libncurses-dfbeac65b06aaa68.rmeta --extern pancurses=/opt/rustwide/target/debug/deps/libpancurses-e51783105cbb0dd8.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-7b500ef21c1d2340.rmeta --extern simplelog=/opt/rustwide/target/debug/deps/libsimplelog-5badc7fed8ffbeac.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ff4cc3f306b4791fa4dfa3a0b22ed0fdb6055e3613787a4aab5efb347dd32008", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff4cc3f306b4791fa4dfa3a0b22ed0fdb6055e3613787a4aab5efb347dd32008", kill_on_drop: false }`
[INFO] [stdout] ff4cc3f306b4791fa4dfa3a0b22ed0fdb6055e3613787a4aab5efb347dd32008