[INFO] cloning repository https://github.com/mbbxAdam/minigrep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mbbxAdam/minigrep" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmbbxAdam%2Fminigrep", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmbbxAdam%2Fminigrep'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c16d0309e9cc9e1b302d5f3c6e8f4bd00321fcf1
[INFO] testing mbbxAdam/minigrep against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FmbbxAdam%2Fminigrep" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mbbxAdam/minigrep on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mbbxAdam/minigrep
[INFO] finished tweaking git repo https://github.com/mbbxAdam/minigrep
[INFO] tweaked toml for git repo https://github.com/mbbxAdam/minigrep written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/mbbxAdam/minigrep already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3faa1762da5453898fc84e4b9a59a44a301c89df4cf15dc99ebae7ba95dd24c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d3faa1762da5453898fc84e4b9a59a44a301c89df4cf15dc99ebae7ba95dd24c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3faa1762da5453898fc84e4b9a59a44a301c89df4cf15dc99ebae7ba95dd24c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3faa1762da5453898fc84e4b9a59a44a301c89df4cf15dc99ebae7ba95dd24c", kill_on_drop: false }`
[INFO] [stdout] d3faa1762da5453898fc84e4b9a59a44a301c89df4cf15dc99ebae7ba95dd24c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d7a96754fa2f0cdb8c31e0f94562090dc46c741072e5fcd55ca450bc49897b2e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d7a96754fa2f0cdb8c31e0f94562090dc46c741072e5fcd55ca450bc49897b2e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:20:27
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |    ---                    ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `std::result::Result<(), std::boxed::Box<(dyn std::error::Error + 'static)>>`
[INFO] [stdout]            found unit type `()`
[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 E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `minigrep`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d7a96754fa2f0cdb8c31e0f94562090dc46c741072e5fcd55ca450bc49897b2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7a96754fa2f0cdb8c31e0f94562090dc46c741072e5fcd55ca450bc49897b2e", kill_on_drop: false }`
[INFO] [stdout] d7a96754fa2f0cdb8c31e0f94562090dc46c741072e5fcd55ca450bc49897b2e