[INFO] updating cached repository sargeras55/rust-edu
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sargeras55/rust-edu
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sargeras55/rust-edu" "work/ex/beta-1.38-1/sources/1.37.0/gh/sargeras55/rust-edu"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sargeras55/rust-edu'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sargeras55/rust-edu" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sargeras55/rust-edu"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sargeras55/rust-edu'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ee2da3f47399b90560f66f09bdfd79b52b3648a0
[INFO] sha for GitHub repo sargeras55/rust-edu: ee2da3f47399b90560f66f09bdfd79b52b3648a0
[INFO] validating manifest of sargeras55/rust-edu 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 sargeras55/rust-edu 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 sargeras55/rust-edu
[INFO] finished frobbing sargeras55/rust-edu
[INFO] frobbed toml for sargeras55/rust-edu written to work/ex/beta-1.38-1/sources/1.37.0/gh/sargeras55/rust-edu/Cargo.toml
[INFO] started frobbing sargeras55/rust-edu
[INFO] finished frobbing sargeras55/rust-edu
[INFO] frobbed toml for sargeras55/rust-edu written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sargeras55/rust-edu/Cargo.toml
[INFO] crate sargeras55/rust-edu 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 sargeras55/rust-edu 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-7/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/sargeras55/rust-edu:/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] 55dd238ad413e2bb35d7abfe86dfd58c52075ae0fbca1b2885b5d5a5fd81dffe
[INFO] running `"docker" "start" "-a" "55dd238ad413e2bb35d7abfe86dfd58c52075ae0fbca1b2885b5d5a5fd81dffe"`
[INFO] [stderr]    Compiling rust_edu v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: `Node` doesn't implement `std::fmt::Display`
[INFO] [stderr]   --> src/main.rs:18:6
[INFO] [stderr]    |
[INFO] [stderr] 18 | impl Graph for MyGraph {
[INFO] [stderr]    |      ^^^^^ `Node` cannot be formatted with the default formatter
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::fmt::Display` is not implemented for `Node`
[INFO] [stderr]    = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `rust_edu`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "55dd238ad413e2bb35d7abfe86dfd58c52075ae0fbca1b2885b5d5a5fd81dffe"`
[INFO] running `"docker" "rm" "-f" "55dd238ad413e2bb35d7abfe86dfd58c52075ae0fbca1b2885b5d5a5fd81dffe"`
[INFO] [stdout] 55dd238ad413e2bb35d7abfe86dfd58c52075ae0fbca1b2885b5d5a5fd81dffe