[INFO] cloning repository https://github.com/vi/netmeasure2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vi/netmeasure2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Fnetmeasure2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Fnetmeasure2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 72f2cf5dc36bf194558c1bf16398e7ac95dd037b
[INFO] documenting vi/netmeasure2 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Fnetmeasure2" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vi/netmeasure2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vi/netmeasure2
[INFO] finished tweaking git repo https://github.com/vi/netmeasure2
[INFO] tweaked toml for git repo https://github.com/vi/netmeasure2 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/vi/netmeasure2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 981179c4fc30215aaaf816eb91b06235210fd69fb5e52778d15dcbf91ef793cd
[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" "981179c4fc30215aaaf816eb91b06235210fd69fb5e52778d15dcbf91ef793cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "981179c4fc30215aaaf816eb91b06235210fd69fb5e52778d15dcbf91ef793cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "981179c4fc30215aaaf816eb91b06235210fd69fb5e52778d15dcbf91ef793cd", kill_on_drop: false }`
[INFO] [stdout] 981179c4fc30215aaaf816eb91b06235210fd69fb5e52778d15dcbf91ef793cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb9d3bf7be9f3a467d245475aff66f511bc1a79ee7aa3b6deb240f28b13b550f
[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" "bb9d3bf7be9f3a467d245475aff66f511bc1a79ee7aa3b6deb240f28b13b550f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking strum v0.19.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand_xorshift v0.2.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_cbor v0.9.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling enum-iterator-derive v0.6.0
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]    Compiling strum_macros v0.19.2
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]     Checking enum-iterator v0.6.0
[INFO] [stderr]     Checking enum-unitary v0.4.2
[INFO] [stderr]     Checking structopt v0.3.17
[INFO] [stderr]  Documenting netmeasure2 v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_blocks)]
[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 `netmeasure2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name netmeasure2 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-1ddb0cb3ede81055.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-f272eb36c0afd908.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-461198e3a3e1689c.rmeta --extern counted_array=/opt/rustwide/target/debug/deps/libcounted_array-aa388058b053afc7.rmeta --extern derivative=/opt/rustwide/target/debug/deps/libderivative-6cdff7bc04e79283.so --extern enum_unitary=/opt/rustwide/target/debug/deps/libenum_unitary-558a065514fd86b9.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-6c9bbe20ce8635c1.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-9f201f71c70a2ee1.rmeta --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-07d1dac511172a59.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-01fac05cb4910d25.rmeta --extern serde_cbor=/opt/rustwide/target/debug/deps/libserde_cbor-d3a5e5bc7cc596fc.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-2193dfb1e2bc1622.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f16726dc95c391dc.rmeta --extern spin_sleep=/opt/rustwide/target/debug/deps/libspin_sleep-ca8744a04e0c3b8e.rmeta --extern static_assertions=/opt/rustwide/target/debug/deps/libstatic_assertions-140fe15ab40ccc28.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-bf278a6b1d451eba.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-cbcc8ba6f447e3a7.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-6a08b0cdfed6a1b2.so --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bb9d3bf7be9f3a467d245475aff66f511bc1a79ee7aa3b6deb240f28b13b550f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb9d3bf7be9f3a467d245475aff66f511bc1a79ee7aa3b6deb240f28b13b550f", kill_on_drop: false }`
[INFO] [stdout] bb9d3bf7be9f3a467d245475aff66f511bc1a79ee7aa3b6deb240f28b13b550f
