[INFO] fetching crate ncomm-executors 1.1.4...
[INFO] testing ncomm-executors-1.1.4 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ncomm-executors 1.1.4 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate ncomm-executors 1.1.4
[INFO] finished tweaking crates.io crate ncomm-executors 1.1.4
[INFO] tweaked toml for crates.io crate ncomm-executors 1.1.4 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ncomm-executors 1.1.4 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 34 packages to latest compatible versions
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded ncomm-core v1.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 3abdde13766870ade3451a1ec4b6fe37efcdadea7bcb5c623c43351d3be686cd
[INFO] running `Command { std: "docker" "start" "-a" "3abdde13766870ade3451a1ec4b6fe37efcdadea7bcb5c623c43351d3be686cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3abdde13766870ade3451a1ec4b6fe37efcdadea7bcb5c623c43351d3be686cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3abdde13766870ade3451a1ec4b6fe37efcdadea7bcb5c623c43351d3be686cd", kill_on_drop: false }`
[INFO] [stdout] 3abdde13766870ade3451a1ec4b6fe37efcdadea7bcb5c623c43351d3be686cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] c9c11efbbe9cb81688f0dcab18e71cc728baac33accfeca7ac29daa60844b3d8
[INFO] running `Command { std: "docker" "start" "-a" "c9c11efbbe9cb81688f0dcab18e71cc728baac33accfeca7ac29daa60844b3d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling ncomm-core v1.1.4
[INFO] [stderr]    Compiling crossbeam-queue v0.3.12
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling crossbeam-deque v0.8.6
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling crossbeam v0.8.4
[INFO] [stderr]    Compiling ncomm-executors v1.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.71s
[INFO] running `Command { std: "docker" "inspect" "c9c11efbbe9cb81688f0dcab18e71cc728baac33accfeca7ac29daa60844b3d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9c11efbbe9cb81688f0dcab18e71cc728baac33accfeca7ac29daa60844b3d8", kill_on_drop: false }`
[INFO] [stdout] c9c11efbbe9cb81688f0dcab18e71cc728baac33accfeca7ac29daa60844b3d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96bec1d43a731d409f07ceafb69d3bc145abb5e6819cb9071c575d1a9dd44738
[INFO] running `Command { std: "docker" "start" "-a" "96bec1d43a731d409f07ceafb69d3bc145abb5e6819cb9071c575d1a9dd44738", kill_on_drop: false }`
[INFO] [stderr]    Compiling ncomm-executors v1.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:17:19
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![cfg_attr(test, feature(downcast_unchecked))]
[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 `ncomm-executors` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "96bec1d43a731d409f07ceafb69d3bc145abb5e6819cb9071c575d1a9dd44738", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96bec1d43a731d409f07ceafb69d3bc145abb5e6819cb9071c575d1a9dd44738", kill_on_drop: false }`
[INFO] [stdout] 96bec1d43a731d409f07ceafb69d3bc145abb5e6819cb9071c575d1a9dd44738