[INFO] fetching crate vec-with-gaps 0.7.0...
[INFO] checking vec-with-gaps-0.7.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate vec-with-gaps 0.7.0 into /workspace/builds/worker-73/source
[INFO] validating manifest of crates.io crate vec-with-gaps 0.7.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vec-with-gaps 0.7.0
[INFO] finished tweaking crates.io crate vec-with-gaps 0.7.0
[INFO] tweaked toml for crates.io crate vec-with-gaps 0.7.0 written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "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 pcg v4.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ed4262eb567970fc0f7ef59215f5c0d0840a675589990441bec8bbaf634c51c
[INFO] running `Command { std: "docker" "start" "-a" "8ed4262eb567970fc0f7ef59215f5c0d0840a675589990441bec8bbaf634c51c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ed4262eb567970fc0f7ef59215f5c0d0840a675589990441bec8bbaf634c51c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ed4262eb567970fc0f7ef59215f5c0d0840a675589990441bec8bbaf634c51c", kill_on_drop: false }`
[INFO] [stdout] 8ed4262eb567970fc0f7ef59215f5c0d0840a675589990441bec8bbaf634c51c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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" "RUSTFLAGS=--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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91e11221e565c8d4d4b248fcea8ea9e33c33971539dcfde0b4a4cf11cadb1521
[INFO] running `Command { std: "docker" "start" "-a" "91e11221e565c8d4d4b248fcea8ea9e33c33971539dcfde0b4a4cf11cadb1521", 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]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking vec-with-gaps v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     generic_associated_types,
[INFO] [stdout] 3 | |     allocator_api,
[INFO] [stdout] 4 | |     exact_size_is_empty,
[INFO] [stdout] 5 | |     type_ascription
[INFO] [stdout] 6 | | )]
[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 compile `vec-with-gaps` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "91e11221e565c8d4d4b248fcea8ea9e33c33971539dcfde0b4a4cf11cadb1521", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91e11221e565c8d4d4b248fcea8ea9e33c33971539dcfde0b4a4cf11cadb1521", kill_on_drop: false }`
[INFO] [stdout] 91e11221e565c8d4d4b248fcea8ea9e33c33971539dcfde0b4a4cf11cadb1521
