[INFO] fetching crate singlemap 0.1.5...
[INFO] documenting singlemap-0.1.5 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate singlemap 0.1.5 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate singlemap 0.1.5 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 singlemap 0.1.5
[INFO] finished tweaking crates.io crate singlemap 0.1.5
[INFO] tweaked toml for crates.io crate singlemap 0.1.5 written to /workspace/builds/worker-24/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] edc912303d78efa94817623316a3e91659120bf51e0eb7b1868388c0550d2654
[INFO] running `Command { std: "docker" "start" "-a" "edc912303d78efa94817623316a3e91659120bf51e0eb7b1868388c0550d2654", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "edc912303d78efa94817623316a3e91659120bf51e0eb7b1868388c0550d2654", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edc912303d78efa94817623316a3e91659120bf51e0eb7b1868388c0550d2654", kill_on_drop: false }`
[INFO] [stdout] edc912303d78efa94817623316a3e91659120bf51e0eb7b1868388c0550d2654
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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] f98da4d0d9a2c81ffafc58c30c98a8b80e86bf9f74bd8cf7593742d8fdbeeff0
[INFO] running `Command { std: "docker" "start" "-a" "f98da4d0d9a2c81ffafc58c30c98a8b80e86bf9f74bd8cf7593742d8fdbeeff0", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling parking_lot_core v0.9.3
[INFO] [stderr]     Checking hashbrown v0.12.1
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]     Checking parking_lot v0.12.0
[INFO] [stderr]     Checking dashmap v5.3.4
[INFO] [stderr]  Documenting singlemap v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.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 `singlemap`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name singlemap src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=cd90ae7d75aed902 -L dependency=/opt/rustwide/target/debug/deps --extern dashmap=/opt/rustwide/target/debug/deps/libdashmap-d6375f9e901e14ae.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-6a77d5dadf64d1bc.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-c40c7c37ac9ee99c.rmeta --cap-lints=warn --crate-version 0.1.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f98da4d0d9a2c81ffafc58c30c98a8b80e86bf9f74bd8cf7593742d8fdbeeff0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f98da4d0d9a2c81ffafc58c30c98a8b80e86bf9f74bd8cf7593742d8fdbeeff0", kill_on_drop: false }`
[INFO] [stdout] f98da4d0d9a2c81ffafc58c30c98a8b80e86bf9f74bd8cf7593742d8fdbeeff0