[INFO] fetching crate rustep 0.1.2...
[INFO] documenting rustep-0.1.2 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate rustep 0.1.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate rustep 0.1.2 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustep 0.1.2
[INFO] finished tweaking crates.io crate rustep 0.1.2
[INFO] tweaked toml for crates.io crate rustep 0.1.2 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 25f1e25fcd8f620c2b3404989fbffb401f5966b0c96e13c3095dbee36cd0230d
[INFO] running `Command { std: "docker" "start" "-a" "25f1e25fcd8f620c2b3404989fbffb401f5966b0c96e13c3095dbee36cd0230d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "25f1e25fcd8f620c2b3404989fbffb401f5966b0c96e13c3095dbee36cd0230d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25f1e25fcd8f620c2b3404989fbffb401f5966b0c96e13c3095dbee36cd0230d", kill_on_drop: false }`
[INFO] [stdout] 25f1e25fcd8f620c2b3404989fbffb401f5966b0c96e13c3095dbee36cd0230d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e755dea5ad49ea1286e092ba38c30306ce9b856242209ff4ce87f7f61792f90
[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" "9e755dea5ad49ea1286e092ba38c30306ce9b856242209ff4ce87f7f61792f90", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]     Checking enumflags v0.3.2
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling proc-macro2 v0.2.3
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]    Compiling quote v0.4.2
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]     Checking num-iter v0.1.41
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking backtrace v0.3.53
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]    Compiling enumflags_derive v0.4.1
[INFO] [stderr]  Documenting rustep v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:49:1
[INFO] [stdout]    |
[INFO] [stdout] 49 | #![feature(try_from)]
[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 `rustep`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name rustep 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 enumflags=/opt/rustwide/target/debug/deps/libenumflags-141bc8fb3fbb5282.rmeta --extern enumflags_derive=/opt/rustwide/target/debug/deps/libenumflags_derive-d4ac2b54906c1939.so --extern failure=/opt/rustwide/target/debug/deps/libfailure-132965df9748e5e2.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-12366c3799f0dcf1.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-3e15de0e5b9d5f60.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-2a74970208a63142.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-75d0567c7bbde356.rmeta --cap-lints=warn --crate-version 0.1.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9e755dea5ad49ea1286e092ba38c30306ce9b856242209ff4ce87f7f61792f90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e755dea5ad49ea1286e092ba38c30306ce9b856242209ff4ce87f7f61792f90", kill_on_drop: false }`
[INFO] [stdout] 9e755dea5ad49ea1286e092ba38c30306ce9b856242209ff4ce87f7f61792f90
