[INFO] fetching crate monotonic_solver 0.5.0...
[INFO] testing monotonic_solver-0.5.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate monotonic_solver 0.5.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate monotonic_solver 0.5.0 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 monotonic_solver 0.5.0
[INFO] finished tweaking crates.io crate monotonic_solver 0.5.0
[INFO] tweaked toml for crates.io crate monotonic_solver 0.5.0 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] crate crates.io crate monotonic_solver 0.5.0 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]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 1535381e6007b04c08ed1fb8f4099470d9ed84ffab14c6a0cb74646401fb5559
[INFO] running `Command { std: "docker" "start" "-a" "1535381e6007b04c08ed1fb8f4099470d9ed84ffab14c6a0cb74646401fb5559", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1535381e6007b04c08ed1fb8f4099470d9ed84ffab14c6a0cb74646401fb5559", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1535381e6007b04c08ed1fb8f4099470d9ed84ffab14c6a0cb74646401fb5559", kill_on_drop: false }`
[INFO] [stdout] 1535381e6007b04c08ed1fb8f4099470d9ed84ffab14c6a0cb74646401fb5559
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 4d89e7744d3cbd47e319d3712bbcdb8a1d396f4c5988ba8308c9d97b9f657bb5
[INFO] running `Command { std: "docker" "start" "-a" "4d89e7744d3cbd47e319d3712bbcdb8a1d396f4c5988ba8308c9d97b9f657bb5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling monotonic_solver v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.24s
[INFO] running `Command { std: "docker" "inspect" "4d89e7744d3cbd47e319d3712bbcdb8a1d396f4c5988ba8308c9d97b9f657bb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d89e7744d3cbd47e319d3712bbcdb8a1d396f4c5988ba8308c9d97b9f657bb5", kill_on_drop: false }`
[INFO] [stdout] 4d89e7744d3cbd47e319d3712bbcdb8a1d396f4c5988ba8308c9d97b9f657bb5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5d0c443a3cdd703947d629835421c03cd32da34ecc39ed17d18f3c17ce2bb1e4
[INFO] running `Command { std: "docker" "start" "-a" "5d0c443a3cdd703947d629835421c03cd32da34ecc39ed17d18f3c17ce2bb1e4", kill_on_drop: false }`
[INFO] [stderr]    Compiling monotonic_solver v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> examples/drama.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_patterns)]
[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 `monotonic_solver` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5d0c443a3cdd703947d629835421c03cd32da34ecc39ed17d18f3c17ce2bb1e4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d0c443a3cdd703947d629835421c03cd32da34ecc39ed17d18f3c17ce2bb1e4", kill_on_drop: false }`
[INFO] [stdout] 5d0c443a3cdd703947d629835421c03cd32da34ecc39ed17d18f3c17ce2bb1e4