[INFO] updating cached repository mbbxAdam/minigrep
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mbbxAdam/minigrep
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mbbxAdam/minigrep" "work/ex/beta-1.38-1/sources/1.37.0/gh/mbbxAdam/minigrep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mbbxAdam/minigrep'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mbbxAdam/minigrep" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mbbxAdam/minigrep"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mbbxAdam/minigrep'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c16d0309e9cc9e1b302d5f3c6e8f4bd00321fcf1
[INFO] sha for GitHub repo mbbxAdam/minigrep: c16d0309e9cc9e1b302d5f3c6e8f4bd00321fcf1
[INFO] validating manifest of mbbxAdam/minigrep on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mbbxAdam/minigrep on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mbbxAdam/minigrep
[INFO] finished frobbing mbbxAdam/minigrep
[INFO] frobbed toml for mbbxAdam/minigrep written to work/ex/beta-1.38-1/sources/1.37.0/gh/mbbxAdam/minigrep/Cargo.toml
[INFO] started frobbing mbbxAdam/minigrep
[INFO] finished frobbing mbbxAdam/minigrep
[INFO] frobbed toml for mbbxAdam/minigrep written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mbbxAdam/minigrep/Cargo.toml
[INFO] crate mbbxAdam/minigrep already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mbbxAdam/minigrep against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mbbxAdam/minigrep:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] f3f5d1b09e3f6de9eaba61d4dc7d1403459f7b5c0d933b983497579ccb8ac2aa
[INFO] running `"docker" "start" "-a" "f3f5d1b09e3f6de9eaba61d4dc7d1403459f7b5c0d933b983497579ccb8ac2aa"`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/main.rs:20:27
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
[INFO] [stderr]    |    ---                    ^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found ()
[INFO] [stderr]    |    |
[INFO] [stderr]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `std::result::Result<(), std::boxed::Box<(dyn std::error::Error + 'static)>>`
[INFO] [stderr]               found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `minigrep`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f3f5d1b09e3f6de9eaba61d4dc7d1403459f7b5c0d933b983497579ccb8ac2aa"`
[INFO] running `"docker" "rm" "-f" "f3f5d1b09e3f6de9eaba61d4dc7d1403459f7b5c0d933b983497579ccb8ac2aa"`
[INFO] [stdout] f3f5d1b09e3f6de9eaba61d4dc7d1403459f7b5c0d933b983497579ccb8ac2aa