[INFO] updating cached repository https://github.com/ice1000/test_proto_bench
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 058d7e383b52a0a5707836d2aa02192b6c4c20ea
[INFO] documenting ice1000/test_proto_bench against master#394e1b40d264aa6928811919c1124fa248e7d802 for pr-73566
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fice1000%2Ftest_proto_bench" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ice1000/test_proto_bench on toolchain 394e1b40d264aa6928811919c1124fa248e7d802
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ice1000/test_proto_bench
[INFO] finished tweaking git repo https://github.com/ice1000/test_proto_bench
[INFO] tweaked toml for git repo https://github.com/ice1000/test_proto_bench written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/ice1000/test_proto_bench already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ade29c8b7df4369672f5228c8d344d0851a0fc5d70a54af2a3861d5d0bba31a6
[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" "ade29c8b7df4369672f5228c8d344d0851a0fc5d70a54af2a3861d5d0bba31a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ade29c8b7df4369672f5228c8d344d0851a0fc5d70a54af2a3861d5d0bba31a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ade29c8b7df4369672f5228c8d344d0851a0fc5d70a54af2a3861d5d0bba31a6", kill_on_drop: false }`
[INFO] [stdout] ade29c8b7df4369672f5228c8d344d0851a0fc5d70a54af2a3861d5d0bba31a6
[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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", 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] b509c3bde6772c3170029ad5705dea6c9a50f67fc7fec74781cb30f74f18d42e
[INFO] running `Command { std: "docker" "start" "-a" "b509c3bde6772c3170029ad5705dea6c9a50f67fc7fec74781cb30f74f18d42e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling cc v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling autocfg v0.1.1
[INFO] [stderr]    Compiling failure_derive v0.1.3
[INFO] [stderr]    Compiling cfg-if v0.1.6
[INFO] [stderr]    Compiling rustc-demangle v0.1.11
[INFO] [stderr]    Compiling byteorder v1.2.7
[INFO] [stderr]    Compiling either v1.5.0
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling termcolor v1.0.4
[INFO] [stderr]    Compiling fixedbitset v0.1.9
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling protobuf v2.2.0
[INFO] [stderr]    Compiling multimap v0.4.0
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling humantime v1.2.0
[INFO] [stderr]    Compiling petgraph v0.4.13
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling backtrace-sys v0.1.26
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling bytes v0.4.11
[INFO] [stderr]     Checking prost v0.4.0
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]     Checking protobuf-codegen v2.2.0
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]     Checking protobuf-codegen-pure v2.2.0
[INFO] [stderr]    Compiling failure v0.1.3
[INFO] [stderr]     Checking quick-protobuf v0.6.3
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling prost-derive v0.4.0
[INFO] [stderr]    Compiling prost-build v0.4.0
[INFO] [stderr]    Compiling prost-types v0.4.0
[INFO] [stderr]    Compiling test_proto_bench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting test_proto_bench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(custom_attribute)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]   |
[INFO] [stdout]   = note: removed in favor of `#![register_tool]` and `#![register_attr]`
[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 E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `test_proto_bench`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name test_proto_bench 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 bytes=/opt/rustwide/target/debug/deps/libbytes-c5de4a7fc2008081.rmeta --extern prost=/opt/rustwide/target/debug/deps/libprost-439d3e349e6b1370.rmeta --extern prost_derive=/opt/rustwide/target/debug/deps/libprost_derive-43040e87e1bf066a.so --extern protobuf=/opt/rustwide/target/debug/deps/libprotobuf-9aa4fb8e2658f2b3.rmeta --extern protobuf_codegen_pure=/opt/rustwide/target/debug/deps/libprotobuf_codegen_pure-c1d9274d5efa9044.rmeta --extern quick_protobuf=/opt/rustwide/target/debug/deps/libquick_protobuf-b92f1698ff14ca94.rmeta --cap-lints=forbid` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b509c3bde6772c3170029ad5705dea6c9a50f67fc7fec74781cb30f74f18d42e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b509c3bde6772c3170029ad5705dea6c9a50f67fc7fec74781cb30f74f18d42e", kill_on_drop: false }`
[INFO] [stdout] b509c3bde6772c3170029ad5705dea6c9a50f67fc7fec74781cb30f74f18d42e