[INFO] cloning repository https://github.com/vks/mpw-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vks/mpw-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvks%2Fmpw-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvks%2Fmpw-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab81ee4340815c607f863fba28a1ffc8d065ebb3
[INFO] documenting vks/mpw-rs 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%2Fvks%2Fmpw-rs" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vks/mpw-rs 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/vks/mpw-rs
[INFO] finished tweaking git repo https://github.com/vks/mpw-rs
[INFO] tweaked toml for git repo https://github.com/vks/mpw-rs written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/vks/mpw-rs 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]  Downloading crates ...
[INFO] [stderr]   Downloaded ring-pwhash v0.12.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 3deec653735d364f82642d36c68766e64931edd975f982d61285e6f4a0ffb08c
[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" "3deec653735d364f82642d36c68766e64931edd975f982d61285e6f4a0ffb08c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3deec653735d364f82642d36c68766e64931edd975f982d61285e6f4a0ffb08c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3deec653735d364f82642d36c68766e64931edd975f982d61285e6f4a0ffb08c", kill_on_drop: false }`
[INFO] [stdout] 3deec653735d364f82642d36c68766e64931edd975f982d61285e6f4a0ffb08c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] c4559a982892c955e63bce37df52142af8ed407d5bc7c27ec3cb9b8804b670f2
[INFO] running `Command { std: "docker" "start" "-a" "c4559a982892c955e63bce37df52142af8ed407d5bc7c27ec3cb9b8804b670f2", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]     Checking lazy_static v0.2.11
[INFO] [stderr]     Checking utf8-ranges v1.0.1
[INFO] [stderr]    Compiling serde v1.0.78
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]     Checking bit-vec v0.4.4
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking untrusted v0.5.1
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]     Checking data-encoding v2.1.1
[INFO] [stderr]     Checking custom_derive v0.1.7
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking quick-error v1.2.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking byteorder v1.2.6
[INFO] [stderr]     Checking data-encoding v1.2.0
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]     Checking conv v0.3.3
[INFO] [stderr]    Compiling lazy_static v1.1.0
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking regex-syntax v0.6.2
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking bit-set v0.4.0
[INFO] [stderr]    Compiling derive_builder_core v0.2.0
[INFO] [stderr]    Compiling syn v0.15.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking memchr v2.0.2
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking errno v0.2.4
[INFO] [stderr]     Checking rpassword v2.0.0
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking aho-corasick v0.6.8
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]     Checking fancy-regex v0.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.78
[INFO] [stderr]     Checking zxcvbn v1.0.1
[INFO] [stderr]     Checking toml v0.4.6
[INFO] [stderr]     Checking ring-pwhash v0.12.0
[INFO] [stderr]  Documenting mpw v0.0.1 (/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(try_from, core_intrinsics)]
[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 `mpw`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name mpw 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 byteorder=/opt/rustwide/target/debug/deps/libbyteorder-5a93b8d92c37a9ce.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-e0513be36f188450.rmeta --extern conv=/opt/rustwide/target/debug/deps/libconv-760ff32e1ae612d0.rmeta --extern data_encoding=/opt/rustwide/target/debug/deps/libdata_encoding-01ca0fd3ab6e6f6b.rmeta --extern errno=/opt/rustwide/target/debug/deps/liberrno-1b9a508262727ab8.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-bbbce6f3f629c25e.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-8687c8ef4e3c6fce.rmeta --extern ring=/opt/rustwide/target/debug/deps/libring-d6dc3333644a31f9.rmeta --extern ring_pwhash=/opt/rustwide/target/debug/deps/libring_pwhash-247789ba3c0a373a.rmeta --extern rpassword=/opt/rustwide/target/debug/deps/librpassword-f4bbce262bf74a63.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-c890edb93b1b75d6.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-51833c9c65403e2f.so --extern toml=/opt/rustwide/target/debug/deps/libtoml-0e39aee29a6a06f5.rmeta --extern zxcvbn=/opt/rustwide/target/debug/deps/libzxcvbn-b9ba0b5c00a12138.rmeta --cap-lints=warn --crate-version 0.0.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "c4559a982892c955e63bce37df52142af8ed407d5bc7c27ec3cb9b8804b670f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c4559a982892c955e63bce37df52142af8ed407d5bc7c27ec3cb9b8804b670f2", kill_on_drop: false }`
[INFO] [stdout] c4559a982892c955e63bce37df52142af8ed407d5bc7c27ec3cb9b8804b670f2