[INFO] updating cached repository sammartin51/gamma
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sammartin51/gamma
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sammartin51/gamma" "work/ex/beta-1.38-1/sources/1.37.0/gh/sammartin51/gamma"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sammartin51/gamma'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sammartin51/gamma" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sammartin51/gamma"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sammartin51/gamma'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8b9af73f8d8b518784dd9ca0b4a73b61eee9e040
[INFO] sha for GitHub repo sammartin51/gamma: 8b9af73f8d8b518784dd9ca0b4a73b61eee9e040
[INFO] validating manifest of sammartin51/gamma 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 sammartin51/gamma 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 sammartin51/gamma
[INFO] finished frobbing sammartin51/gamma
[INFO] frobbed toml for sammartin51/gamma written to work/ex/beta-1.38-1/sources/1.37.0/gh/sammartin51/gamma/Cargo.toml
[INFO] started frobbing sammartin51/gamma
[INFO] finished frobbing sammartin51/gamma
[INFO] frobbed toml for sammartin51/gamma written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sammartin51/gamma/Cargo.toml
[INFO] crate sammartin51/gamma 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 sammartin51/gamma against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sammartin51/gamma:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3bd9388591a9082360bf93c455a53d16e4e9fb1b0484aed72f5e71c5ce2077a5
[INFO] running `"docker" "start" "-a" "3bd9388591a9082360bf93c455a53d16e4e9fb1b0484aed72f5e71c5ce2077a5"`
[INFO] [stderr]    Compiling text_io v0.1.6
[INFO] [stderr]    Compiling chrono v0.3.1
[INFO] [stderr]    Compiling hello_world v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/main.rs:44:18
[INFO] [stderr]    |
[INFO] [stderr] 44 |             _ => println!("try again")
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^^ expected struct `tree::NodeZipper`, found ()
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `tree::NodeZipper<task::Task>`
[INFO] [stderr]               found type `()`
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[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 `hello_world`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3bd9388591a9082360bf93c455a53d16e4e9fb1b0484aed72f5e71c5ce2077a5"`
[INFO] running `"docker" "rm" "-f" "3bd9388591a9082360bf93c455a53d16e4e9fb1b0484aed72f5e71c5ce2077a5"`
[INFO] [stdout] 3bd9388591a9082360bf93c455a53d16e4e9fb1b0484aed72f5e71c5ce2077a5