[INFO] fetching crate tree-automata 0.1.2...
[INFO] testing tree-automata-0.1.2 against 1.60.0 for beta-1.61-1
[INFO] extracting crate tree-automata 0.1.2 into /workspace/builds/worker-111/source
[INFO] validating manifest of crates.io crate tree-automata 0.1.2 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tree-automata 0.1.2
[INFO] finished tweaking crates.io crate tree-automata 0.1.2
[INFO] tweaked toml for crates.io crate tree-automata 0.1.2 written to /workspace/builds/worker-111/source/Cargo.toml
[INFO] crate crates.io crate tree-automata 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded terms v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 978db7198976b4981b630787361060bfc6603f6e024731a4aa7fdd8e298d7a50
[INFO] running `Command { std: "docker" "start" "-a" "978db7198976b4981b630787361060bfc6603f6e024731a4aa7fdd8e298d7a50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "978db7198976b4981b630787361060bfc6603f6e024731a4aa7fdd8e298d7a50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "978db7198976b4981b630787361060bfc6603f6e024731a4aa7fdd8e298d7a50", kill_on_drop: false }`
[INFO] [stdout] 978db7198976b4981b630787361060bfc6603f6e024731a4aa7fdd8e298d7a50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1770e4c1f698e98af69e3a56d664b35e75a7bf07252e6fc7847e8e18f950542c
[INFO] running `Command { std: "docker" "start" "-a" "1770e4c1f698e98af69e3a56d664b35e75a7bf07252e6fc7847e8e18f950542c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling crossbeam-channel v0.4.3
[INFO] [stderr]    Compiling terms v0.1.2
[INFO] [stderr]    Compiling tree-automata v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trait_alias)]
[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 `tree-automata` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1770e4c1f698e98af69e3a56d664b35e75a7bf07252e6fc7847e8e18f950542c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1770e4c1f698e98af69e3a56d664b35e75a7bf07252e6fc7847e8e18f950542c", kill_on_drop: false }`
[INFO] [stdout] 1770e4c1f698e98af69e3a56d664b35e75a7bf07252e6fc7847e8e18f950542c