[INFO] cloning repository https://github.com/smirnovvad/test_ex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/smirnovvad/test_ex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmirnovvad%2Ftest_ex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmirnovvad%2Ftest_ex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 48963f2c9bbed4ec061a7943d9e8e2197d63d1ac
[INFO] testing smirnovvad/test_ex against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsmirnovvad%2Ftest_ex" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/smirnovvad/test_ex 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 git repo https://github.com/smirnovvad/test_ex
[INFO] finished tweaking git repo https://github.com/smirnovvad/test_ex
[INFO] tweaked toml for git repo https://github.com/smirnovvad/test_ex written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/smirnovvad/test_ex already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 666ea669388925c77bf66f40a38dd137fbdcc51cb8556a0a7c47a80f17bcfbd5
[INFO] running `Command { std: "docker" "start" "-a" "666ea669388925c77bf66f40a38dd137fbdcc51cb8556a0a7c47a80f17bcfbd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "666ea669388925c77bf66f40a38dd137fbdcc51cb8556a0a7c47a80f17bcfbd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "666ea669388925c77bf66f40a38dd137fbdcc51cb8556a0a7c47a80f17bcfbd5", kill_on_drop: false }`
[INFO] [stdout] 666ea669388925c77bf66f40a38dd137fbdcc51cb8556a0a7c47a80f17bcfbd5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e7e61f1adc432b2cd0bfe412c63790b2929f0a5f4b4cd61f2867ba9c6788708
[INFO] running `Command { std: "docker" "start" "-a" "9e7e61f1adc432b2cd0bfe412c63790b2929f0a5f4b4cd61f2867ba9c6788708", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling pin-project-lite v0.2.4
[INFO] [stderr]    Compiling futures-core v0.3.12
[INFO] [stderr]    Compiling futures-sink v0.3.12
[INFO] [stderr]    Compiling futures-io v0.3.12
[INFO] [stderr]    Compiling tokio v1.2.0
[INFO] [stderr]    Compiling lock_api v0.4.2
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling futures-channel v0.3.12
[INFO] [stderr]    Compiling futures-task v0.3.12
[INFO] [stderr]    Compiling parking_lot_core v0.8.2
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.7
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling futures-macro v0.3.12
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]    Compiling futures-util v0.3.12
[INFO] [stderr]    Compiling futures-executor v0.3.12
[INFO] [stderr]    Compiling futures v0.3.12
[INFO] [stderr]    Compiling test_ex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[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 `test_ex` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9e7e61f1adc432b2cd0bfe412c63790b2929f0a5f4b4cd61f2867ba9c6788708", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e7e61f1adc432b2cd0bfe412c63790b2929f0a5f4b4cd61f2867ba9c6788708", kill_on_drop: false }`
[INFO] [stdout] 9e7e61f1adc432b2cd0bfe412c63790b2929f0a5f4b4cd61f2867ba9c6788708