[INFO] cloning repository https://github.com/Edgeworth/mhrono
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Edgeworth/mhrono" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdgeworth%2Fmhrono", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdgeworth%2Fmhrono'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 212fe1c8908fef5c4cedc151b81e72669fa737ef
[INFO] documenting Edgeworth/mhrono against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdgeworth%2Fmhrono" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Edgeworth/mhrono 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 git repo https://github.com/Edgeworth/mhrono
[INFO] finished tweaking git repo https://github.com/Edgeworth/mhrono
[INFO] tweaked toml for git repo https://github.com/Edgeworth/mhrono written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/Edgeworth/mhrono already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/Edgeworth/moldenfile`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded uncased v0.9.7
[INFO] [stderr]   Downloaded rust_decimal_macros v1.23.1
[INFO] [stderr]   Downloaded rust_decimal v1.23.1
[INFO] [stderr]   Downloaded once_cell v1.11.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c394983965654d57ad7188c9e15bbfdb88b0e5f3476ceb8b1220ee2ba9559002
[INFO] running `Command { std: "docker" "start" "-a" "c394983965654d57ad7188c9e15bbfdb88b0e5f3476ceb8b1220ee2ba9559002", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c394983965654d57ad7188c9e15bbfdb88b0e5f3476ceb8b1220ee2ba9559002", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c394983965654d57ad7188c9e15bbfdb88b0e5f3476ceb8b1220ee2ba9559002", kill_on_drop: false }`
[INFO] [stdout] c394983965654d57ad7188c9e15bbfdb88b0e5f3476ceb8b1220ee2ba9559002
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d7ed2d2f49fc98ebf41750a8576e5060d983eaf905c16797851c65021746e6cf
[INFO] running `Command { std: "docker" "start" "-a" "d7ed2d2f49fc98ebf41750a8576e5060d983eaf905c16797851c65021746e6cf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling siphasher v0.3.10
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]    Compiling rust_decimal v1.23.1
[INFO] [stderr]    Compiling arrayvec v0.7.2
[INFO] [stderr]    Compiling eyre v0.6.8
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]     Checking indenter v0.3.3
[INFO] [stderr]     Checking once_cell v1.11.0
[INFO] [stderr]    Compiling uncased v0.9.7
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling phf_shared v0.10.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling getrandom v0.2.6
[INFO] [stderr]     Checking phf v0.10.1
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling regex v1.5.5
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling parse-zoneinfo v0.3.0
[INFO] [stderr]     Checking num-integer v0.1.45
[INFO] [stderr]    Compiling phf_generator v0.10.0
[INFO] [stderr]    Compiling phf_codegen v0.10.0
[INFO] [stderr]    Compiling chrono-tz-build v0.0.2
[INFO] [stderr]    Compiling chrono-tz v0.6.1
[INFO] [stderr]    Compiling rust_decimal_macros v1.23.1
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]  Documenting mhrono 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:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #![feature(once_cell, trait_alias)]
[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 `mhrono`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name mhrono src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=84c2427d6114f9ea -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-a792734e6aa053cd.rmeta --extern chrono_tz=/opt/rustwide/target/debug/deps/libchrono_tz-117d4c05cfdb4dc0.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-ae1f45806efe266e.so --extern eyre=/opt/rustwide/target/debug/deps/libeyre-00e638f5edb9eb78.rmeta --extern num_derive=/opt/rustwide/target/debug/deps/libnum_derive-8c60ddfa262ba106.so --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-881ce0f8723e0e2d.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-efb7a43670652d5c.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-6f05a460e7f44d13.rmeta --extern rust_decimal=/opt/rustwide/target/debug/deps/librust_decimal-6bc2059aa91af117.rmeta --extern rust_decimal_macros=/opt/rustwide/target/debug/deps/librust_decimal_macros-60edc7b09ff8778f.so --extern serde=/opt/rustwide/target/debug/deps/libserde-b3b87f46a79345b8.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d7ed2d2f49fc98ebf41750a8576e5060d983eaf905c16797851c65021746e6cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7ed2d2f49fc98ebf41750a8576e5060d983eaf905c16797851c65021746e6cf", kill_on_drop: false }`
[INFO] [stdout] d7ed2d2f49fc98ebf41750a8576e5060d983eaf905c16797851c65021746e6cf