[INFO] fetching crate loalang 0.1.20...
[INFO] documenting loalang-0.1.20 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate loalang 0.1.20 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate loalang 0.1.20 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 loalang 0.1.20
[INFO] finished tweaking crates.io crate loalang 0.1.20
[INFO] tweaked toml for crates.io crate loalang 0.1.20 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate loalang 0.1.20 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] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 40fc6387dbb4d8abab00584155e49828403f83e1836584c80629227e00a79d70
[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" "40fc6387dbb4d8abab00584155e49828403f83e1836584c80629227e00a79d70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "40fc6387dbb4d8abab00584155e49828403f83e1836584c80629227e00a79d70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40fc6387dbb4d8abab00584155e49828403f83e1836584c80629227e00a79d70", kill_on_drop: false }`
[INFO] [stdout] 40fc6387dbb4d8abab00584155e49828403f83e1836584c80629227e00a79d70
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5ca33d6ad1a656b0b81105ab7162102205fbeb2b295cf9279257c9e17dc8ee4f
[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" "5ca33d6ad1a656b0b81105ab7162102205fbeb2b295cf9279257c9e17dc8ee4f", kill_on_drop: false }`
[INFO] [stderr] warning: only one of `license` or `license-file` is necessary
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.5
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling unicode-segmentation v1.5.0
[INFO] [stderr]     Checking strum v0.17.1
[INFO] [stderr]     Checking peekmore v0.4.0
[INFO] [stderr]     Checking ngrammatic v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling bincode v1.2.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]    Compiling strum_macros v0.17.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking fraction v0.6.2
[INFO] [stderr]  Documenting loalang v0.1.20 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib/mod.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_patterns, try_trait)]
[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 `loalang`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name loa src/lib/mod.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern atty=/opt/rustwide/target/debug/deps/libatty-27b4c9d546abb603.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-d9a5f966c1d832aa.rmeta --extern fraction=/opt/rustwide/target/debug/deps/libfraction-b0988923dd7c4c9c.rmeta --extern glob=/opt/rustwide/target/debug/deps/libglob-91c2b32d0ceb9511.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-8323f990c1bf056d.rmeta --extern matches=/opt/rustwide/target/debug/deps/libmatches-375a61cf355a0c26.rmeta --extern ngrammatic=/opt/rustwide/target/debug/deps/libngrammatic-101e6d7a7a9f4fbf.rmeta --extern num_bigint=/opt/rustwide/target/debug/deps/libnum_bigint-cc2a29b1322fb060.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-661f8bc1128d8c0f.rmeta --extern peekmore=/opt/rustwide/target/debug/deps/libpeekmore-8c4e0119c5e4ee82.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-6c87d1455ffce48a.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-9522db049f6070ad.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-bc259169550716a0.so --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "5ca33d6ad1a656b0b81105ab7162102205fbeb2b295cf9279257c9e17dc8ee4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ca33d6ad1a656b0b81105ab7162102205fbeb2b295cf9279257c9e17dc8ee4f", kill_on_drop: false }`
[INFO] [stdout] 5ca33d6ad1a656b0b81105ab7162102205fbeb2b295cf9279257c9e17dc8ee4f