[INFO] fetching crate vidar 0.1.0...
[INFO] documenting vidar-0.1.0 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate vidar 0.1.0 into /workspace/builds/worker-18/source
[INFO] validating manifest of crates.io crate vidar 0.1.0 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vidar 0.1.0
[INFO] finished tweaking crates.io crate vidar 0.1.0
[INFO] tweaked toml for crates.io crate vidar 0.1.0 written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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" "+beta-2022-05-20" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9100d445cad4ca823526df4968c388322efab368dc918a2cb7288964873a558
[INFO] running `Command { std: "docker" "start" "-a" "a9100d445cad4ca823526df4968c388322efab368dc918a2cb7288964873a558", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9100d445cad4ca823526df4968c388322efab368dc918a2cb7288964873a558", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9100d445cad4ca823526df4968c388322efab368dc918a2cb7288964873a558", kill_on_drop: false }`
[INFO] [stdout] a9100d445cad4ca823526df4968c388322efab368dc918a2cb7288964873a558
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 42c99c4187293a5d0af8419da8decb21977a849d4ce6dad8fa4900ea623b502b
[INFO] running `Command { std: "docker" "start" "-a" "42c99c4187293a5d0af8419da8decb21977a849d4ce6dad8fa4900ea623b502b", 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]    Compiling unicode-xid v0.0.4
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking miniz_oxide v0.5.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]    Compiling derive_builder_core v0.2.0
[INFO] [stderr]    Compiling getset v0.0.5
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]  Documenting vidar v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(try_from)]
[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 `vidar`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name vidar src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b12d6c91b0632e6a -L dependency=/opt/rustwide/target/debug/deps --extern derive_builder=/opt/rustwide/target/debug/deps/libderive_builder-88ea071b7b2e6036.so --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-be03e3d90de2960e.rmeta --extern getset=/opt/rustwide/target/debug/deps/libgetset-f2adf8790fe25b1b.so --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "42c99c4187293a5d0af8419da8decb21977a849d4ce6dad8fa4900ea623b502b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42c99c4187293a5d0af8419da8decb21977a849d4ce6dad8fa4900ea623b502b", kill_on_drop: false }`
[INFO] [stdout] 42c99c4187293a5d0af8419da8decb21977a849d4ce6dad8fa4900ea623b502b