[INFO] fetching crate gitmoji 1.0.0...
[INFO] documenting gitmoji-1.0.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate gitmoji 1.0.0 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate gitmoji 1.0.0 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 crates.io crate gitmoji 1.0.0
[INFO] finished tweaking crates.io crate gitmoji 1.0.0
[INFO] tweaked toml for crates.io crate gitmoji 1.0.0 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate crates.io crate gitmoji 1.0.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 3c25f870c12abf072a1b87f304ed2efec53b810f7cd9765b0c9f17755676bf72
[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" "3c25f870c12abf072a1b87f304ed2efec53b810f7cd9765b0c9f17755676bf72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c25f870c12abf072a1b87f304ed2efec53b810f7cd9765b0c9f17755676bf72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c25f870c12abf072a1b87f304ed2efec53b810f7cd9765b0c9f17755676bf72", kill_on_drop: false }`
[INFO] [stdout] 3c25f870c12abf072a1b87f304ed2efec53b810f7cd9765b0c9f17755676bf72
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] d5becbd6fae6781f4de2000daa7e0d05e873e9236ae43b140884f5631f56b7de
[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" "d5becbd6fae6781f4de2000daa7e0d05e873e9236ae43b140884f5631f56b7de", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]     Checking futures-core v0.3.1
[INFO] [stderr]     Checking pin-project-lite v0.1.4
[INFO] [stderr]    Compiling openssl v0.10.27
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking futures-task v0.3.1
[INFO] [stderr]     Checking futures-sink v0.3.1
[INFO] [stderr]     Checking futures-io v0.3.1
[INFO] [stderr]    Compiling encoding_rs v0.8.22
[INFO] [stderr]     Checking dtoa v0.4.5
[INFO] [stderr]     Checking ansi_term v0.7.5
[INFO] [stderr]     Checking strum v0.8.0
[INFO] [stderr]     Checking directories v0.10.0
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]     Checking json v0.12.1
[INFO] [stderr]     Checking http v0.2.0
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling indexmap v1.3.1
[INFO] [stderr]    Compiling openssl-sys v0.9.54
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking futures-channel v0.3.1
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking term_size v0.3.1
[INFO] [stderr]     Checking serde_json v1.0.45
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]     Checking spinner v0.5.0
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]     Checking tokio v0.2.11
[INFO] [stderr]     Checking confy v0.3.1
[INFO] [stderr]    Compiling strum_macros v0.8.0
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking spinners v1.2.0
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking h2 v0.2.1
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-error v0.4.8
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.8
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]    Compiling structopt-derive v0.4.2
[INFO] [stderr]     Checking hyper v0.13.2
[INFO] [stderr]     Checking structopt v0.3.9
[INFO] [stderr]     Checking enquirer v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking reqwest v0.10.1
[INFO] [stderr]  Documenting gitmoji v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/main.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(with_options)]
[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 `gitmoji`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name gitmoji 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 clap=/opt/rustwide/target/debug/deps/libclap-91e017e367b41b07.rmeta --extern colored=/opt/rustwide/target/debug/deps/libcolored-7dee46ddd35497e6.rmeta --extern confy=/opt/rustwide/target/debug/deps/libconfy-50b9c4236e599eab.rmeta --extern dialoguer=/opt/rustwide/target/debug/deps/libdialoguer-b685b12d828523d8.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-05d656eaec448d28.rmeta --extern enquirer=/opt/rustwide/target/debug/deps/libenquirer-b0da9cb095b52662.rmeta --extern json=/opt/rustwide/target/debug/deps/libjson-b9e47b1c0d3bd49b.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-73595990842a8ae4.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-a9e16b12fe0de2e8.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ad08fc17c2d1843f.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-b191b361f400b9b2.so --extern spinners=/opt/rustwide/target/debug/deps/libspinners-9dea7e50f42d23f5.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "d5becbd6fae6781f4de2000daa7e0d05e873e9236ae43b140884f5631f56b7de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5becbd6fae6781f4de2000daa7e0d05e873e9236ae43b140884f5631f56b7de", kill_on_drop: false }`
[INFO] [stdout] d5becbd6fae6781f4de2000daa7e0d05e873e9236ae43b140884f5631f56b7de