[INFO] fetching crate snocat 0.2.0-alpha.13...
[INFO] documenting snocat-0.2.0-alpha.13 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate snocat 0.2.0-alpha.13 into /workspace/builds/worker-104/source
[INFO] validating manifest of crates.io crate snocat 0.2.0-alpha.13 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate snocat 0.2.0-alpha.13
[INFO] finished tweaking crates.io crate snocat 0.2.0-alpha.13
[INFO] tweaked toml for crates.io crate snocat 0.2.0-alpha.13 written to /workspace/builds/worker-104/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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" "+1.54.0" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 59f9a15ae4f093a31c5110a6e477652149ac6c8ed131c60fb60591ad1992f365
[INFO] running `Command { std: "docker" "start" "-a" "59f9a15ae4f093a31c5110a6e477652149ac6c8ed131c60fb60591ad1992f365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "59f9a15ae4f093a31c5110a6e477652149ac6c8ed131c60fb60591ad1992f365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59f9a15ae4f093a31c5110a6e477652149ac6c8ed131c60fb60591ad1992f365", kill_on_drop: false }`
[INFO] [stdout] 59f9a15ae4f093a31c5110a6e477652149ac6c8ed131c60fb60591ad1992f365
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-104/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0d5d88781058a1662f92ad5b75cad05f0c457581c080cfb7f2e90effd4f9a40
[INFO] running `Command { std: "docker" "start" "-a" "d0d5d88781058a1662f92ad5b75cad05f0c457581c080cfb7f2e90effd4f9a40", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking slab v0.4.4
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking futures-sink v0.3.16
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking futures-io v0.3.16
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling anyhow v1.0.42
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking downcast-rs v1.2.0
[INFO] [stderr]     Checking tinyvec v1.3.1
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking tracing-core v0.1.18
[INFO] [stderr]     Checking sharded-slab v0.1.3
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking socket2 v0.3.19
[INFO] [stderr]     Checking tracing-log v0.1.2
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking sct v0.6.1
[INFO] [stderr]     Checking webpki v0.21.4
[INFO] [stderr]     Checking ct-logs v0.8.0
[INFO] [stderr]     Checking rustls v0.19.1
[INFO] [stderr]     Checking rustls-native-certs v0.5.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.15
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]     Checking tracing v0.1.26
[INFO] [stderr]     Checking pin-project v1.0.8
[INFO] [stderr]     Checking quinn-proto v0.7.3
[INFO] [stderr]     Checking tracing-futures v0.2.5
[INFO] [stderr]     Checking futures-executor v0.3.16
[INFO] [stderr]     Checking futures v0.3.16
[INFO] [stderr]     Checking gen-z v0.1.0
[INFO] [stderr]     Checking tokio-util v0.6.7
[INFO] [stderr]     Checking quinn v0.7.2
[INFO] [stderr]     Checking tokio-stream v0.1.7
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]     Checking tracing-subscriber v0.2.19
[INFO] [stderr]  Documenting snocat v0.2.0-alpha.13 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(async_closure)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(backtrace)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(label_break_value)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(try_blocks)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(type_ascription)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![feature(generic_associated_types)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 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 `snocat`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type rlib --crate-type cdylib --crate-name snocat src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="core"' --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-c71486e08dde7454.rmeta --extern downcast_rs=/opt/rustwide/target/debug/deps/libdowncast_rs-a09f2941b4ede59d.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-0a04d8860f0b4bf8.rmeta --extern futures_io=/opt/rustwide/target/debug/deps/libfutures_io-83cca1fc4fd17372.rmeta --extern gen_z=/opt/rustwide/target/debug/deps/libgen_z-c26b3ea178042139.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f8abb66ffc16068c.rmeta --extern quinn=/opt/rustwide/target/debug/deps/libquinn-e55261bcc16f75da.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-df1c680f233dbcab.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-41a3def67325b585.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-e6f46b178d972a75.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-9fe9bf1e39b05987.rmeta --extern tokio_stream=/opt/rustwide/target/debug/deps/libtokio_stream-81667694109ddc9f.rmeta --extern tokio_util=/opt/rustwide/target/debug/deps/libtokio_util-8ba32a90bae9ee9e.rmeta --extern tracing=/opt/rustwide/target/debug/deps/libtracing-00664e863ff3aa1f.rmeta --extern tracing_futures=/opt/rustwide/target/debug/deps/libtracing_futures-d8b6d0c23e844ad0.rmeta --extern tracing_subscriber=/opt/rustwide/target/debug/deps/libtracing_subscriber-bde9993549d7ed23.rmeta --cap-lints=warn --crate-version 0.2.0-alpha.13` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d0d5d88781058a1662f92ad5b75cad05f0c457581c080cfb7f2e90effd4f9a40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0d5d88781058a1662f92ad5b75cad05f0c457581c080cfb7f2e90effd4f9a40", kill_on_drop: false }`
[INFO] [stdout] d0d5d88781058a1662f92ad5b75cad05f0c457581c080cfb7f2e90effd4f9a40
