[INFO] cloning repository https://github.com/museun/a-mistake
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/museun/a-mistake" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmuseun%2Fa-mistake", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmuseun%2Fa-mistake'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56d9199462b6ba88de454a94bb52c4926efe0f63
[INFO] documenting museun/a-mistake 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%2Fmuseun%2Fa-mistake" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/museun/a-mistake 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/museun/a-mistake
[INFO] finished tweaking git repo https://github.com/museun/a-mistake
[INFO] tweaked toml for git repo https://github.com/museun/a-mistake written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/museun/a-mistake 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 curl-sys v0.4.15
[INFO] [stderr]   Downloaded curl v0.4.19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] ecdf00848299ec7c1d584bb55c5f76ccf5c173faddbece2f0886dd76c0a93a6a
[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" "ecdf00848299ec7c1d584bb55c5f76ccf5c173faddbece2f0886dd76c0a93a6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ecdf00848299ec7c1d584bb55c5f76ccf5c173faddbece2f0886dd76c0a93a6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecdf00848299ec7c1d584bb55c5f76ccf5c173faddbece2f0886dd76c0a93a6a", kill_on_drop: false }`
[INFO] [stdout] ecdf00848299ec7c1d584bb55c5f76ccf5c173faddbece2f0886dd76c0a93a6a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 3cf17d3f3d9fc033d5abc93791d5bbf338b41e20342493c496def3e1b2a0e3e3
[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" "3cf17d3f3d9fc033d5abc93791d5bbf338b41e20342493c496def3e1b2a0e3e3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cc v1.0.27
[INFO] [stderr]    Compiling serde v1.0.82
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]     Checking term v0.5.1
[INFO] [stderr]     Checking time v0.1.41
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking rand v0.6.1
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking regex v1.1.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling openssl-sys v0.9.40
[INFO] [stderr]    Compiling curl-sys v0.4.15
[INFO] [stderr]     Checking simplelog v0.5.3
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking curl v0.4.19
[INFO] [stderr]  Documenting a-mistake 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(bind_by_move_pattern_guards)]
[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 `a-mistake`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name a_mistake 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-86fb1d0d254e7c0f.rmeta --extern curl=/opt/rustwide/target/debug/deps/libcurl-2573d500982fedd6.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-a5ad19ed0335222d.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-c2820ce931b86e08.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-71729f7839d9a2ab.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-b9ce4051b4ffe93e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-18e08620bed77abe.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-e45f037a8bf628ee.rmeta --extern simplelog=/opt/rustwide/target/debug/deps/libsimplelog-816f75dc8c016f1f.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "3cf17d3f3d9fc033d5abc93791d5bbf338b41e20342493c496def3e1b2a0e3e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cf17d3f3d9fc033d5abc93791d5bbf338b41e20342493c496def3e1b2a0e3e3", kill_on_drop: false }`
[INFO] [stdout] 3cf17d3f3d9fc033d5abc93791d5bbf338b41e20342493c496def3e1b2a0e3e3