[INFO] fetching crate trie 0.2.1...
[INFO] testing trie-0.2.1 against 1.54.0 for beta-1.55-1
[INFO] extracting crate trie 0.2.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate trie 0.2.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate trie 0.2.1
[INFO] finished tweaking crates.io crate trie 0.2.1
[INFO] tweaked toml for crates.io crate trie 0.2.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 192741a35c221fef109d288017c716803d96e3f4339caa94b177a476f2e5e617
[INFO] running `Command { std: "docker" "start" "-a" "192741a35c221fef109d288017c716803d96e3f4339caa94b177a476f2e5e617", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "192741a35c221fef109d288017c716803d96e3f4339caa94b177a476f2e5e617", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "192741a35c221fef109d288017c716803d96e3f4339caa94b177a476f2e5e617", kill_on_drop: false }`
[INFO] [stdout] 192741a35c221fef109d288017c716803d96e3f4339caa94b177a476f2e5e617
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c331a43a374d17114eae4e1822e926ac4417d2edcc7ae1d8d97053ab7cc302c
[INFO] running `Command { std: "docker" "start" "-a" "8c331a43a374d17114eae4e1822e926ac4417d2edcc7ae1d8d97053ab7cc302c", kill_on_drop: false }`
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling ordered_iter v0.1.2
[INFO] [stderr]    Compiling trie v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.96s
[INFO] running `Command { std: "docker" "inspect" "8c331a43a374d17114eae4e1822e926ac4417d2edcc7ae1d8d97053ab7cc302c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c331a43a374d17114eae4e1822e926ac4417d2edcc7ae1d8d97053ab7cc302c", kill_on_drop: false }`
[INFO] [stdout] 8c331a43a374d17114eae4e1822e926ac4417d2edcc7ae1d8d97053ab7cc302c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e15ba23a68ce42f3881318f486613994f2fa1230ea8855c2240b793f872571f5
[INFO] running `Command { std: "docker" "start" "-a" "e15ba23a68ce42f3881318f486613994f2fa1230ea8855c2240b793f872571f5", kill_on_drop: false }`
[INFO] [stderr]    Compiling trie v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:13:19
[INFO] [stdout]    |
[INFO] [stdout] 13 | #![cfg_attr(test, feature(fn_traits, test, unboxed_closures))]
[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 `trie`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e15ba23a68ce42f3881318f486613994f2fa1230ea8855c2240b793f872571f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e15ba23a68ce42f3881318f486613994f2fa1230ea8855c2240b793f872571f5", kill_on_drop: false }`
[INFO] [stdout] e15ba23a68ce42f3881318f486613994f2fa1230ea8855c2240b793f872571f5
