[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 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%2Ftedgkassen%2Frust-slackbot" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tedgkassen/rust-slackbot 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/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-5/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slack v0.22.0
[INFO] [stderr]   Downloaded subprocess v0.1.16
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 6a5c323548baaa2bf714fa9df98c39dd0ebfd9a0908efd120a574eb3e3accfb8
[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" "6a5c323548baaa2bf714fa9df98c39dd0ebfd9a0908efd120a574eb3e3accfb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a5c323548baaa2bf714fa9df98c39dd0ebfd9a0908efd120a574eb3e3accfb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a5c323548baaa2bf714fa9df98c39dd0ebfd9a0908efd120a574eb3e3accfb8", kill_on_drop: false }`
[INFO] [stdout] 6a5c323548baaa2bf714fa9df98c39dd0ebfd9a0908efd120a574eb3e3accfb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] cdeaf9a2cbf2682b5daf919aa6049086f1184f822868ba5e92b0887b1ac9279e
[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" "cdeaf9a2cbf2682b5daf919aa6049086f1184f822868ba5e92b0887b1ac9279e", kill_on_drop: false }`
[INFO] [stderr]    Compiling openssl v0.10.12
[INFO] [stderr]    Compiling native-tls v0.2.1
[INFO] [stderr]    Compiling encoding_rs v0.8.10
[INFO] [stderr]     Checking subprocess v0.1.16
[INFO] [stderr]    Compiling mysqlclient-sys v0.2.3
[INFO] [stderr]    Compiling openssl-sys v0.9.36
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking url v1.7.1
[INFO] [stderr]     Checking input_buffer v0.2.0
[INFO] [stderr]     Checking libflate v0.1.18
[INFO] [stderr]     Checking h2 v0.1.12
[INFO] [stderr]     Checking mime v0.3.9
[INFO] [stderr]     Checking toml v0.4.8
[INFO] [stderr]    Compiling diesel_derives v1.3.0
[INFO] [stderr]     Checking sha-1 v0.7.0
[INFO] [stderr]     Checking mime_guess v2.0.0-alpha.6
[INFO] [stderr]     Checking serde_urlencoded v0.5.3
[INFO] [stderr]     Checking hyper v0.12.11
[INFO] [stderr]     Checking diesel v1.3.3
[INFO] [stderr]     Checking tungstenite v0.6.0
[INFO] [stderr]     Checking hyper-tls v0.3.1
[INFO] [stderr]     Checking reqwest v0.9.2
[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 beta 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] [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 `mugman`.
[INFO] [stderr] 
[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-84ef3a04c77d9879.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-ff3c67c44de67b58.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-14f856f079f391d2.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-0b94e2d18ba31619.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-f90c4e95667b7adc.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-33ec0face6d895fe.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-048d2f30f801171e.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-863db4b47625f0d9.rmeta --extern slack=/opt/rustwide/target/debug/deps/libslack-d393a50d22071b79.rmeta --extern subprocess=/opt/rustwide/target/debug/deps/libsubprocess-a60a712744fced2c.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-9d2177be42d9db9b.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "cdeaf9a2cbf2682b5daf919aa6049086f1184f822868ba5e92b0887b1ac9279e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cdeaf9a2cbf2682b5daf919aa6049086f1184f822868ba5e92b0887b1ac9279e", kill_on_drop: false }`
[INFO] [stdout] cdeaf9a2cbf2682b5daf919aa6049086f1184f822868ba5e92b0887b1ac9279e