[INFO] cloning repository https://github.com/camjw/obj-duplicator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/camjw/obj-duplicator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamjw%2Fobj-duplicator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamjw%2Fobj-duplicator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f154740c62931563cfc565e3c370a840670fed9f
[INFO] testing camjw/obj-duplicator against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcamjw%2Fobj-duplicator" "/workspace/builds/worker-39/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-39/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/camjw/obj-duplicator on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/camjw/obj-duplicator
[INFO] finished tweaking git repo https://github.com/camjw/obj-duplicator
[INFO] tweaked toml for git repo https://github.com/camjw/obj-duplicator written to /workspace/builds/worker-39/source/Cargo.toml
[INFO] crate git repo https://github.com/camjw/obj-duplicator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 331c9ef9d8bf7c4e159dd62c2fd0ac211bc3cdedf0c65685c573c6e7029c3138
[INFO] running `Command { std: "docker" "start" "-a" "331c9ef9d8bf7c4e159dd62c2fd0ac211bc3cdedf0c65685c573c6e7029c3138", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "331c9ef9d8bf7c4e159dd62c2fd0ac211bc3cdedf0c65685c573c6e7029c3138", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "331c9ef9d8bf7c4e159dd62c2fd0ac211bc3cdedf0c65685c573c6e7029c3138", kill_on_drop: false }`
[INFO] [stdout] 331c9ef9d8bf7c4e159dd62c2fd0ac211bc3cdedf0c65685c573c6e7029c3138
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eff57249d96d30adcaac939d7808fe9ff2950e640b60e2465742b28101fd17c6
[INFO] running `Command { std: "docker" "start" "-a" "eff57249d96d30adcaac939d7808fe9ff2950e640b60e2465742b28101fd17c6", kill_on_drop: false }`
[INFO] [stderr]    Compiling obj-double-sider v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(pattern)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/main.rs:6:42
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::{BufRead, BufReader, Error, Write};
[INFO] [stdout]   |                                          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `obj-double-sider` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "eff57249d96d30adcaac939d7808fe9ff2950e640b60e2465742b28101fd17c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eff57249d96d30adcaac939d7808fe9ff2950e640b60e2465742b28101fd17c6", kill_on_drop: false }`
[INFO] [stdout] eff57249d96d30adcaac939d7808fe9ff2950e640b60e2465742b28101fd17c6