[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 beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvi%2Fnetmeasure2" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vi/netmeasure2 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vi/netmeasure2
[INFO] removed workspace from 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-9/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-9/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded counted-array v0.1.2
[INFO] [stderr]   Downloaded enum-unitary v0.4.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad35e0dfda609476cc51bab7f44627fdd1b93f2d9d8ac47a589dd05d73dd283f
[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" "ad35e0dfda609476cc51bab7f44627fdd1b93f2d9d8ac47a589dd05d73dd283f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad35e0dfda609476cc51bab7f44627fdd1b93f2d9d8ac47a589dd05d73dd283f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad35e0dfda609476cc51bab7f44627fdd1b93f2d9d8ac47a589dd05d73dd283f", kill_on_drop: false }`
[INFO] [stdout] ad35e0dfda609476cc51bab7f44627fdd1b93f2d9d8ac47a589dd05d73dd283f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 04c516409261ea18438192113fa34fea4d48d3fa82bc20709b82d4966d7b490b
[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" "04c516409261ea18438192113fa34fea4d48d3fa82bc20709b82d4966d7b490b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking half v1.6.0
[INFO] [stderr]     Checking counted-array v0.1.2
[INFO] [stderr]     Checking strum v0.19.2
[INFO] [stderr]     Checking spin_sleep v1.0.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking rand_xorshift v0.2.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[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 enum-iterator-derive v0.6.0
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]    Compiling strum_macros v0.19.2
[INFO] [stderr]    Compiling serde_derive v1.0.115
[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 beta 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-23dff0c64805ed62.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-cea469b3ed57026e.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-364c148656283980.rmeta --extern counted_array=/opt/rustwide/target/debug/deps/libcounted_array-0ddf0b4b8e0cf81c.rmeta --extern derivative=/opt/rustwide/target/debug/deps/libderivative-91686d30f2ca4c14.so --extern enum_unitary=/opt/rustwide/target/debug/deps/libenum_unitary-891234ff1b0894dd.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-389af87ce6697360.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-349a2a0a9f44bd1f.rmeta --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-5c0048496bfb240e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1a0148d363561a2a.rmeta --extern serde_cbor=/opt/rustwide/target/debug/deps/libserde_cbor-879999f1858fd39a.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-89ca884293cadaed.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-df7e1517dab2b2b1.rmeta --extern spin_sleep=/opt/rustwide/target/debug/deps/libspin_sleep-ba39200c4d41a9e6.rmeta --extern static_assertions=/opt/rustwide/target/debug/deps/libstatic_assertions-cc8e46707ea09364.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-2a94b16d57d0a39d.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-a598e74983bdba8d.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-d23ae4ca79623e9e.so --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "04c516409261ea18438192113fa34fea4d48d3fa82bc20709b82d4966d7b490b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04c516409261ea18438192113fa34fea4d48d3fa82bc20709b82d4966d7b490b", kill_on_drop: false }`
[INFO] [stdout] 04c516409261ea18438192113fa34fea4d48d3fa82bc20709b82d4966d7b490b