[INFO] fetching crate copernica-protocols 0.1.0...
[INFO] documenting copernica-protocols-0.1.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate copernica-protocols 0.1.0 into /workspace/builds/worker-96/source
[INFO] validating manifest of crates.io crate copernica-protocols 0.1.0 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate copernica-protocols 0.1.0
[INFO] finished tweaking crates.io crate copernica-protocols 0.1.0
[INFO] tweaked toml for crates.io crate copernica-protocols 0.1.0 written to /workspace/builds/worker-96/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bech32 v0.7.3
[INFO] [stderr]   Downloaded cryptoxide v0.3.6
[INFO] [stderr]   Downloaded copernica-common v0.1.0
[INFO] [stderr]   Downloaded keynesis v1.4.0
[INFO] [stderr]   Downloaded copernica-packets v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f87f66f4176f3a1cf79c468d215c4779e4aa7b2d3b4ad3f2c748235b1708d5f5
[INFO] running `Command { std: "docker" "start" "-a" "f87f66f4176f3a1cf79c468d215c4779e4aa7b2d3b4ad3f2c748235b1708d5f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f87f66f4176f3a1cf79c468d215c4779e4aa7b2d3b4ad3f2c748235b1708d5f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f87f66f4176f3a1cf79c468d215c4779e4aa7b2d3b4ad3f2c748235b1708d5f5", kill_on_drop: false }`
[INFO] [stdout] f87f66f4176f3a1cf79c468d215c4779e4aa7b2d3b4ad3f2c748235b1708d5f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-96/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f642be1f115a11724a12d587ba2272462a53e654fc309f34f8128440d46430a
[INFO] running `Command { std: "docker" "start" "-a" "2f642be1f115a11724a12d587ba2272462a53e654fc309f34f8128440d46430a", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling anyhow v1.0.57
[INFO] [stderr]     Checking cryptoxide v0.3.6
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking bech32 v0.7.3
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking serde v1.0.137
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking fern v0.5.9
[INFO] [stderr]    Compiling thiserror-impl v1.0.31
[INFO] [stderr]     Checking copernica-common v0.1.0
[INFO] [stderr]     Checking thiserror v1.0.31
[INFO] [stderr]     Checking keynesis v1.4.0
[INFO] [stderr]     Checking copernica-packets v0.1.0
[INFO] [stderr]  Documenting copernica-protocols v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(map_first_last)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `copernica-protocols`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name copernica_protocols src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f115ccbd13f790b8 -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-a2ad8fa07e0781ab.rmeta --extern bincode=/opt/rustwide/target/debug/deps/libbincode-a7c649b1a2b759b8.rmeta --extern copernica_common=/opt/rustwide/target/debug/deps/libcopernica_common-59a39c9815c3f101.rmeta --extern copernica_packets=/opt/rustwide/target/debug/deps/libcopernica_packets-557b84d6c8ff75b5.rmeta --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-0828918ca0bde37b.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-4c2b941844e2fcbb.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2f642be1f115a11724a12d587ba2272462a53e654fc309f34f8128440d46430a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f642be1f115a11724a12d587ba2272462a53e654fc309f34f8128440d46430a", kill_on_drop: false }`
[INFO] [stdout] 2f642be1f115a11724a12d587ba2272462a53e654fc309f34f8128440d46430a