[INFO] fetching crate ffgen 0.3.5...
[INFO] documenting ffgen-0.3.5 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate ffgen 0.3.5 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate ffgen 0.3.5 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 ffgen 0.3.5
[INFO] finished tweaking crates.io crate ffgen 0.3.5
[INFO] tweaked toml for crates.io crate ffgen 0.3.5 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate ffgen 0.3.5 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]  Downloading crates ...
[INFO] [stderr]   Downloaded clap_complete v3.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 203eb1a2e5e5be75c869b3b24bc48edbf2dcd37724d7a8163a0570fdcfb12f92
[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" "203eb1a2e5e5be75c869b3b24bc48edbf2dcd37724d7a8163a0570fdcfb12f92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "203eb1a2e5e5be75c869b3b24bc48edbf2dcd37724d7a8163a0570fdcfb12f92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "203eb1a2e5e5be75c869b3b24bc48edbf2dcd37724d7a8163a0570fdcfb12f92", kill_on_drop: false }`
[INFO] [stdout] 203eb1a2e5e5be75c869b3b24bc48edbf2dcd37724d7a8163a0570fdcfb12f92
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 98f6cee558b69bfe3098a080238658a08a0b434900123c2ae73edf37570c17a0
[INFO] running `Command { std: "docker" "start" "-a" "98f6cee558b69bfe3098a080238658a08a0b434900123c2ae73edf37570c17a0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling syn v1.0.84
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling serde_derive v1.0.133
[INFO] [stderr]    Compiling serde v1.0.133
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling anyhow v1.0.52
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling serde_json v1.0.74
[INFO] [stderr]     Checking md5 v0.7.0
[INFO] [stderr]    Compiling erased-serde v0.3.17
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]     Checking os_str_bytes v6.0.0
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling textwrap v0.14.2
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking crypto-common v0.1.1
[INFO] [stderr]     Checking block-buffer v0.10.0
[INFO] [stderr]     Checking digest v0.10.1
[INFO] [stderr]     Checking md-5 v0.10.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling clap_derive v3.0.0
[INFO] [stderr]    Compiling strum_macros v0.23.1
[INFO] [stderr]    Compiling strum v0.23.0
[INFO] [stderr]    Compiling clap v3.0.1
[INFO] [stderr]     Checking clap_complete v3.0.1
[INFO] [stderr]    Compiling ffgen v0.3.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_yaml v0.8.23
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking fake v2.4.3
[INFO] [stderr]  Documenting ffgen v0.3.5 (/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(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 `ffgen`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name ffgen src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=a2fb1f50f8cbb391 -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-6acff3152a12ecf8.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-07254a5aa23a3adf.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-c21f1af516582481.rmeta --extern clap_complete=/opt/rustwide/target/debug/deps/libclap_complete-6c7dc9ce04d7c3d4.rmeta --extern csv=/opt/rustwide/target/debug/deps/libcsv-2ef2fbacfaaa4339.rmeta --extern erased_serde=/opt/rustwide/target/debug/deps/liberased_serde-a0c7992f04eaa098.rmeta --extern fake=/opt/rustwide/target/debug/deps/libfake-ce47128b9a4557bd.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern md5=/opt/rustwide/target/debug/deps/libmd5-3fb36678135c2c90.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-9648225ad6ebebae.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-160640b61594a687.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-bdb2b5ab26864839.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-1a9537064c2e28de.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-0a853c5dbcac1969.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-72c3cbfa048b1cc9.rmeta --cap-lints=warn --crate-version 0.3.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "98f6cee558b69bfe3098a080238658a08a0b434900123c2ae73edf37570c17a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98f6cee558b69bfe3098a080238658a08a0b434900123c2ae73edf37570c17a0", kill_on_drop: false }`
[INFO] [stdout] 98f6cee558b69bfe3098a080238658a08a0b434900123c2ae73edf37570c17a0