[INFO] fetching crate atter 0.1.1...
[INFO] documenting atter-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate atter 0.1.1 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate atter 0.1.1 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 atter 0.1.1
[INFO] finished tweaking crates.io crate atter 0.1.1
[INFO] tweaked toml for crates.io crate atter 0.1.1 written to /workspace/builds/worker-20/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 rusqlite v0.27.0
[INFO] [stderr]   Downloaded uuid v0.6.5
[INFO] [stderr]   Downloaded bincode v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 5d2ca4354c22f6a0b01791a040500b2961588a130530f45859643eb2bdf5cb5e
[INFO] running `Command { std: "docker" "start" "-a" "5d2ca4354c22f6a0b01791a040500b2961588a130530f45859643eb2bdf5cb5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5d2ca4354c22f6a0b01791a040500b2961588a130530f45859643eb2bdf5cb5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d2ca4354c22f6a0b01791a040500b2961588a130530f45859643eb2bdf5cb5e", kill_on_drop: false }`
[INFO] [stdout] 5d2ca4354c22f6a0b01791a040500b2961588a130530f45859643eb2bdf5cb5e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 066220eb058138b4f3a6c1b4bfc349588bc2219567d31970d6afeb0547e26dca
[INFO] running `Command { std: "docker" "start" "-a" "066220eb058138b4f3a6c1b4bfc349588bc2219567d31970d6afeb0547e26dca", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling vcpkg v0.2.15
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]     Checking gimli v0.26.1
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking matches v0.1.9
[INFO] [stderr]     Checking ucd-util v0.1.8
[INFO] [stderr]     Checking unicode-bidi v0.3.8
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]     Checking sha1_smol v1.0.0
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking fallible-iterator v0.2.0
[INFO] [stderr]     Checking fallible-streaming-iterator v0.1.9
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking utf8-ranges v1.0.5
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]     Checking sha1 v0.6.1
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling libsqlite3-sys v0.24.2
[INFO] [stderr]    Compiling backtrace v0.3.65
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]     Checking object v0.28.4
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking hashlink v0.7.0
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking rusqlite v0.27.0
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking uuid v0.6.5
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]    Compiling getset v0.1.2
[INFO] [stderr]  Documenting atter v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:279:12
[INFO] [stdout]     |
[INFO] [stdout] 279 | #![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 `atter`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name atter src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=9cbb8d8cde96a0db -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-7118074d766106e3.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-6d746c54ca487b20.rmeta --extern getset=/opt/rustwide/target/debug/deps/libgetset-37fadd36a44ea26f.so --extern regex=/opt/rustwide/target/debug/deps/libregex-31428ec11cfa1761.rmeta --extern rusqlite=/opt/rustwide/target/debug/deps/librusqlite-c2136d2dfd9d8f83.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-495ec9fdc6b7531e.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-83f91e0782093c72.so --extern toml=/opt/rustwide/target/debug/deps/libtoml-018c3e2955d2d58f.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-29972a20cdb13f26.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-b0529a7bad8eed88.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "066220eb058138b4f3a6c1b4bfc349588bc2219567d31970d6afeb0547e26dca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "066220eb058138b4f3a6c1b4bfc349588bc2219567d31970d6afeb0547e26dca", kill_on_drop: false }`
[INFO] [stdout] 066220eb058138b4f3a6c1b4bfc349588bc2219567d31970d6afeb0547e26dca