[INFO] updating cached repository marionebl/rust-by-example-exercises
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/marionebl/rust-by-example-exercises
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/marionebl/rust-by-example-exercises" "work/ex/beta-1.38-1/sources/1.37.0/gh/marionebl/rust-by-example-exercises"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/marionebl/rust-by-example-exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/marionebl/rust-by-example-exercises" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marionebl/rust-by-example-exercises"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marionebl/rust-by-example-exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b22ea9a4d0448f54fdbc20b0d014f13f44ae816e
[INFO] sha for GitHub repo marionebl/rust-by-example-exercises: b22ea9a4d0448f54fdbc20b0d014f13f44ae816e
[INFO] validating manifest of marionebl/rust-by-example-exercises 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 marionebl/rust-by-example-exercises 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 marionebl/rust-by-example-exercises
[INFO] finished frobbing marionebl/rust-by-example-exercises
[INFO] frobbed toml for marionebl/rust-by-example-exercises written to work/ex/beta-1.38-1/sources/1.37.0/gh/marionebl/rust-by-example-exercises/Cargo.toml
[INFO] started frobbing marionebl/rust-by-example-exercises
[INFO] finished frobbing marionebl/rust-by-example-exercises
[INFO] frobbed toml for marionebl/rust-by-example-exercises written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/marionebl/rust-by-example-exercises/Cargo.toml
[INFO] crate marionebl/rust-by-example-exercises 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 marionebl/rust-by-example-exercises 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/marionebl/rust-by-example-exercises:/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] 661dc5c913c709803f4392960cf863b49b108b4e27ee7de651db633b6bc435e9
[INFO] running `"docker" "start" "-a" "661dc5c913c709803f4392960cf863b49b108b4e27ee7de651db633b6bc435e9"`
[INFO] [stderr]    Compiling rust-by-example-exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused arithmetic operation that must be used
[INFO] [stderr]   --> src/bin/7-expressions.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |         2 * x;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: expected item, found `36`
[INFO] [stderr]   --> src/bin/13-5-2-generic-bounds-multiple.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | 36
[INFO] [stderr]    | ^^ expected item
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust-by-example-exercises`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/bin/8-2-loop.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         println!("This point will never be reached");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unreachable_code)] on by default
[INFO] [stderr]    = note: this warning 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: build failed
[INFO] running `"docker" "inspect" "661dc5c913c709803f4392960cf863b49b108b4e27ee7de651db633b6bc435e9"`
[INFO] running `"docker" "rm" "-f" "661dc5c913c709803f4392960cf863b49b108b4e27ee7de651db633b6bc435e9"`
[INFO] [stdout] 661dc5c913c709803f4392960cf863b49b108b4e27ee7de651db633b6bc435e9