[INFO] fetching crate rusty_alfred 0.1.1...
[INFO] testing rusty_alfred-0.1.1 against 1.54.0 for beta-1.55-1
[INFO] extracting crate rusty_alfred 0.1.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rusty_alfred 0.1.1 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 rusty_alfred 0.1.1
[INFO] finished tweaking crates.io crate rusty_alfred 0.1.1
[INFO] tweaked toml for crates.io crate rusty_alfred 0.1.1 written to /workspace/builds/worker-6/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] a9cd4af3ca65df8b495fefc01ab7a35c4ac5f8acb1fa00fc15dfc104bb2d0bc0
[INFO] running `Command { std: "docker" "start" "-a" "a9cd4af3ca65df8b495fefc01ab7a35c4ac5f8acb1fa00fc15dfc104bb2d0bc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9cd4af3ca65df8b495fefc01ab7a35c4ac5f8acb1fa00fc15dfc104bb2d0bc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9cd4af3ca65df8b495fefc01ab7a35c4ac5f8acb1fa00fc15dfc104bb2d0bc0", kill_on_drop: false }`
[INFO] [stdout] a9cd4af3ca65df8b495fefc01ab7a35c4ac5f8acb1fa00fc15dfc104bb2d0bc0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] e6e47245e8adab570716e614f99c9a322c0ee017a55c524cc6efc887fdbd727d
[INFO] running `Command { std: "docker" "start" "-a" "e6e47245e8adab570716e614f99c9a322c0ee017a55c524cc6efc887fdbd727d", kill_on_drop: false }`
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling serde_codegen v0.8.23
[INFO] [stderr]    Compiling error-chain v0.5.0
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling serde_derive v0.8.23
[INFO] [stderr]    Compiling rusty_alfred v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:21:1
[INFO] [stdout]    |
[INFO] [stdout] 21 | #![feature(proc_macro)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[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 `rusty_alfred`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e6e47245e8adab570716e614f99c9a322c0ee017a55c524cc6efc887fdbd727d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6e47245e8adab570716e614f99c9a322c0ee017a55c524cc6efc887fdbd727d", kill_on_drop: false }`
[INFO] [stdout] e6e47245e8adab570716e614f99c9a322c0ee017a55c524cc6efc887fdbd727d
