[INFO] fetching crate zeros 19.0.0...
[INFO] testing zeros-19.0.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate zeros 19.0.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate zeros 19.0.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate zeros 19.0.0
[INFO] tweaked toml for crates.io crate zeros 19.0.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate zeros 19.0.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate zeros 19.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded find-msvc-tools v0.1.0
[INFO] [stderr]   Downloaded chacha20-poly1305-aead v0.1.2
[INFO] [stderr]   Downloaded kib v7.1.1
[INFO] [stderr]   Downloaded cc v1.2.35
[INFO] [stderr]   Downloaded bnum v0.13.0
[INFO] [stderr]   Downloaded libc v0.2.175
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7bf16b0837c64e02ed59b144af6271d02f9fd47909bf7f0c4bf6bd8d27c2dc6
[INFO] running `Command { std: "docker" "start" "-a" "c7bf16b0837c64e02ed59b144af6271d02f9fd47909bf7f0c4bf6bd8d27c2dc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7bf16b0837c64e02ed59b144af6271d02f9fd47909bf7f0c4bf6bd8d27c2dc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7bf16b0837c64e02ed59b144af6271d02f9fd47909bf7f0c4bf6bd8d27c2dc6", kill_on_drop: false }`
[INFO] [stdout] c7bf16b0837c64e02ed59b144af6271d02f9fd47909bf7f0c4bf6bd8d27c2dc6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2d04c04cb19e3cd465f406d3e733cf7a9dee4385a43bc0655b7f1e4bc0555058
[INFO] running `Command { std: "docker" "start" "-a" "2d04c04cb19e3cd465f406d3e733cf7a9dee4385a43bc0655b7f1e4bc0555058", kill_on_drop: false }`
[INFO] [stderr]    Compiling zeros v19.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | #![feature(bigint_helper_methods)]
[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:67:1
[INFO] [stdout]    |
[INFO] [stdout] 67 | #![feature(doc_cfg)]
[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:68:1
[INFO] [stdout]    |
[INFO] [stdout] 68 | #![feature(test)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `zeros` (lib) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "2d04c04cb19e3cd465f406d3e733cf7a9dee4385a43bc0655b7f1e4bc0555058", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d04c04cb19e3cd465f406d3e733cf7a9dee4385a43bc0655b7f1e4bc0555058", kill_on_drop: false }`
[INFO] [stdout] 2d04c04cb19e3cd465f406d3e733cf7a9dee4385a43bc0655b7f1e4bc0555058