[INFO] fetching crate oursh 0.2.0...
[INFO] documenting oursh-0.2.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate oursh 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate oursh 0.2.0 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 oursh 0.2.0
[INFO] finished tweaking crates.io crate oursh 0.2.0
[INFO] tweaked toml for crates.io crate oursh 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 6e130a7d6a9c4c999701181b6eb1bc7f927e5571386e32d6323bdf8f83c67953
[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" "6e130a7d6a9c4c999701181b6eb1bc7f927e5571386e32d6323bdf8f83c67953", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6e130a7d6a9c4c999701181b6eb1bc7f927e5571386e32d6323bdf8f83c67953", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e130a7d6a9c4c999701181b6eb1bc7f927e5571386e32d6323bdf8f83c67953", kill_on_drop: false }`
[INFO] [stdout] 6e130a7d6a9c4c999701181b6eb1bc7f927e5571386e32d6323bdf8f83c67953
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 57b0dccc8a0bd321e5b62b9edbed64a2a93b1b84235b4e542bb152913aed7f8d
[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" "57b0dccc8a0bd321e5b62b9edbed64a2a93b1b84235b4e542bb152913aed7f8d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling bit-vec v0.6.2
[INFO] [stderr]    Compiling lalrpop-util v0.16.3
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking utf8 v0.0.2
[INFO] [stderr]    Compiling ena v0.11.0
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]     Checking docopt v0.8.3
[INFO] [stderr]     Checking pwd v1.3.0
[INFO] [stderr]    Compiling string_cache v0.7.5
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]     Checking termion v1.5.5
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling sha2 v0.8.2
[INFO] [stderr]    Compiling lalrpop v0.16.3
[INFO] [stderr]    Compiling oursh v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting oursh v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:77:1
[INFO] [stdout]    |
[INFO] [stdout] 77 | #![feature(alloc_system, box_syntax, box_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 `oursh`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name oursh src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="history"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern docopt=/opt/rustwide/target/debug/deps/libdocopt-08a9c80ebf5854a3.rmeta --extern lalrpop_util=/opt/rustwide/target/debug/deps/liblalrpop_util-d0cdef6646c65ea2.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-fd0758429a6d2482.rmeta --extern pwd=/opt/rustwide/target/debug/deps/libpwd-d60363b0543b9b6b.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-9a2a36c880f9f1fd.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-5a248c86dd2f6ec8.rmeta --extern utf8=/opt/rustwide/target/debug/deps/libutf8-9fb461c992bb8bc7.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "57b0dccc8a0bd321e5b62b9edbed64a2a93b1b84235b4e542bb152913aed7f8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57b0dccc8a0bd321e5b62b9edbed64a2a93b1b84235b4e542bb152913aed7f8d", kill_on_drop: false }`
[INFO] [stdout] 57b0dccc8a0bd321e5b62b9edbed64a2a93b1b84235b4e542bb152913aed7f8d