[INFO] cloning repository https://github.com/tedgkassen/rust-slackbot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tedgkassen/rust-slackbot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftedgkassen%2Frust-slackbot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftedgkassen%2Frust-slackbot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0e534fc25874e972c4bb2a8c41774a7f1e896208
[INFO] documenting tedgkassen/rust-slackbot against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftedgkassen%2Frust-slackbot" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tedgkassen/rust-slackbot on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tedgkassen/rust-slackbot
[INFO] finished tweaking git repo https://github.com/tedgkassen/rust-slackbot
[INFO] tweaked toml for git repo https://github.com/tedgkassen/rust-slackbot written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/tedgkassen/rust-slackbot already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 35dc8eed4eb668332e5f1dd80400e7ce81cfcd9b1d318bd32224a2168f4ba3e0
[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" "35dc8eed4eb668332e5f1dd80400e7ce81cfcd9b1d318bd32224a2168f4ba3e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "35dc8eed4eb668332e5f1dd80400e7ce81cfcd9b1d318bd32224a2168f4ba3e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35dc8eed4eb668332e5f1dd80400e7ce81cfcd9b1d318bd32224a2168f4ba3e0", kill_on_drop: false }`
[INFO] [stdout] 35dc8eed4eb668332e5f1dd80400e7ce81cfcd9b1d318bd32224a2168f4ba3e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f96848a2b7876fc0907e87321e12525b63b3a604fda23375b7e0f9dd2208ce1
[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" "8f96848a2b7876fc0907e87321e12525b63b3a604fda23375b7e0f9dd2208ce1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.20
[INFO] [stderr]    Compiling encoding_rs v0.8.10
[INFO] [stderr]    Compiling memchr v2.1.0
[INFO] [stderr]     Checking subprocess v0.1.16
[INFO] [stderr]    Compiling mysqlclient-sys v0.2.3
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking tokio-io v0.1.9
[INFO] [stderr]     Checking input_buffer v0.2.0
[INFO] [stderr]     Checking serde_json v1.0.32
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]     Checking toml v0.4.8
[INFO] [stderr]     Checking mime v0.3.9
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking serde_urlencoded v0.5.3
[INFO] [stderr]     Checking libflate v0.1.18
[INFO] [stderr]     Checking parking_lot_core v0.3.1
[INFO] [stderr]     Checking sha-1 v0.7.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.7
[INFO] [stderr]     Checking mime_guess v2.0.0-alpha.6
[INFO] [stderr]     Checking tungstenite v0.6.0
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking h2 v0.1.12
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking aho-corasick v0.6.8
[INFO] [stderr]     Checking tokio-reactor v0.1.6
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio-fs v0.1.3
[INFO] [stderr]     Checking regex v1.0.5
[INFO] [stderr]     Checking tokio-uds v0.2.2
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-udp v0.1.2
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]     Checking tokio v0.1.11
[INFO] [stderr]    Compiling syn v0.15.9
[INFO] [stderr]     Checking hyper v0.12.11
[INFO] [stderr]     Checking hyper-tls v0.3.1
[INFO] [stderr]    Compiling diesel_derives v1.3.0
[INFO] [stderr]     Checking reqwest v0.9.2
[INFO] [stderr]    Compiling serde_derive v1.0.79
[INFO] [stderr]     Checking diesel v1.3.3
[INFO] [stderr]     Checking slack_api v0.21.0
[INFO] [stderr]     Checking slack v0.22.0
[INFO] [stderr]  Documenting mugman v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `mugman`.
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name mugman 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 diesel=/opt/rustwide/target/debug/deps/libdiesel-80bfa2b13ccdb2ad.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-96c1ea82010db8ba.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-e553570402679d85.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-40decc8e95865318.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-7c0699c32c248886.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-02c53eac70096ba1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-d4121af7aa667abb.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-20b48ea22f0827cd.rmeta --extern slack=/opt/rustwide/target/debug/deps/libslack-032090172033f40a.rmeta --extern subprocess=/opt/rustwide/target/debug/deps/libsubprocess-d3c9205193c02c25.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-730a2d9ae043d81b.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8f96848a2b7876fc0907e87321e12525b63b3a604fda23375b7e0f9dd2208ce1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f96848a2b7876fc0907e87321e12525b63b3a604fda23375b7e0f9dd2208ce1", kill_on_drop: false }`
[INFO] [stdout] 8f96848a2b7876fc0907e87321e12525b63b3a604fda23375b7e0f9dd2208ce1