[INFO] fetching crate monotonic_solver 0.5.0...
[INFO] testing monotonic_solver-0.5.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate monotonic_solver 0.5.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate monotonic_solver 0.5.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "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-5-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 152d68755a4a4e5ca69f5a21800508efd2285caffb7071183dbafb22353583e1
[INFO] running `Command { std: "docker" "start" "-a" "152d68755a4a4e5ca69f5a21800508efd2285caffb7071183dbafb22353583e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "152d68755a4a4e5ca69f5a21800508efd2285caffb7071183dbafb22353583e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "152d68755a4a4e5ca69f5a21800508efd2285caffb7071183dbafb22353583e1", kill_on_drop: false }`
[INFO] [stdout] 152d68755a4a4e5ca69f5a21800508efd2285caffb7071183dbafb22353583e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f48a200ceca136bf36ed80dfb7fec4c2056dadd5c5dd45ae1055e9198afa2b73
[INFO] running `Command { std: "docker" "start" "-a" "f48a200ceca136bf36ed80dfb7fec4c2056dadd5c5dd45ae1055e9198afa2b73", kill_on_drop: false }`
[INFO] [stderr]    Compiling monotonic_solver v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "f48a200ceca136bf36ed80dfb7fec4c2056dadd5c5dd45ae1055e9198afa2b73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f48a200ceca136bf36ed80dfb7fec4c2056dadd5c5dd45ae1055e9198afa2b73", kill_on_drop: false }`
[INFO] [stdout] f48a200ceca136bf36ed80dfb7fec4c2056dadd5c5dd45ae1055e9198afa2b73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f5ac20a1f6706f1dedef9e59e1f39db39a57f2b8ac5edd6c21922a4bec4c6ce
[INFO] running `Command { std: "docker" "start" "-a" "1f5ac20a1f6706f1dedef9e59e1f39db39a57f2b8ac5edd6c21922a4bec4c6ce", 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` (example "drama") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "1f5ac20a1f6706f1dedef9e59e1f39db39a57f2b8ac5edd6c21922a4bec4c6ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f5ac20a1f6706f1dedef9e59e1f39db39a57f2b8ac5edd6c21922a4bec4c6ce", kill_on_drop: false }`
[INFO] [stdout] 1f5ac20a1f6706f1dedef9e59e1f39db39a57f2b8ac5edd6c21922a4bec4c6ce
