[INFO] updating cached repository upenn-cis198-2018f/Lecture6
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/upenn-cis198-2018f/Lecture6
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/upenn-cis198-2018f/Lecture6" "work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/upenn-cis198-2018f/Lecture6" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/upenn-cis198-2018f/Lecture6"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/upenn-cis198-2018f/Lecture6'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b24735f2feb566aa92d433c6c4c6550092e78365
[INFO] sha for GitHub repo upenn-cis198-2018f/Lecture6: b24735f2feb566aa92d433c6c4c6550092e78365
[INFO] validating manifest of upenn-cis198-2018f/Lecture6 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of upenn-cis198-2018f/Lecture6 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing upenn-cis198-2018f/Lecture6
[INFO] finished frobbing upenn-cis198-2018f/Lecture6
[INFO] frobbed toml for upenn-cis198-2018f/Lecture6 written to work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6/Cargo.toml
[INFO] started frobbing upenn-cis198-2018f/Lecture6
[INFO] finished frobbing upenn-cis198-2018f/Lecture6
[INFO] frobbed toml for upenn-cis198-2018f/Lecture6 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/upenn-cis198-2018f/Lecture6/Cargo.toml
[INFO] crate upenn-cis198-2018f/Lecture6 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing upenn-cis198-2018f/Lecture6 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 5859acbafdb07e4e8421ad5769ecc9972dab83e3955ef6f406205742aa0b7e87
[INFO] running `"docker" "start" "-a" "5859acbafdb07e4e8421ad5769ecc9972dab83e3955ef6f406205742aa0b7e87"`
[INFO] [stderr]    Compiling lecture6 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::fmt::Display`
[INFO] [stderr]  --> src/generics.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fmt::Display;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "5859acbafdb07e4e8421ad5769ecc9972dab83e3955ef6f406205742aa0b7e87"`
[INFO] running `"docker" "rm" "-f" "5859acbafdb07e4e8421ad5769ecc9972dab83e3955ef6f406205742aa0b7e87"`
[INFO] [stdout] 5859acbafdb07e4e8421ad5769ecc9972dab83e3955ef6f406205742aa0b7e87
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] beb9b04a0aa0f05f79c25165af14d753ecd350e16a818b606ec8f10854c52c54
[INFO] running `"docker" "start" "-a" "beb9b04a0aa0f05f79c25165af14d753ecd350e16a818b606ec8f10854c52c54"`
[INFO] [stderr]    Compiling lecture6 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::fmt::Display`
[INFO] [stderr]  --> src/generics.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::fmt::Display;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `"docker" "inspect" "beb9b04a0aa0f05f79c25165af14d753ecd350e16a818b606ec8f10854c52c54"`
[INFO] running `"docker" "rm" "-f" "beb9b04a0aa0f05f79c25165af14d753ecd350e16a818b606ec8f10854c52c54"`
[INFO] [stdout] beb9b04a0aa0f05f79c25165af14d753ecd350e16a818b606ec8f10854c52c54
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/upenn-cis198-2018f/Lecture6:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] e446dbd3bf508e96f5553db40db922ab72e2026839c51caae30b70b5fd0dce28
[INFO] running `"docker" "start" "-a" "e446dbd3bf508e96f5553db40db922ab72e2026839c51caae30b70b5fd0dce28"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/lecture6-5a67499c726bfb34
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "e446dbd3bf508e96f5553db40db922ab72e2026839c51caae30b70b5fd0dce28"`
[INFO] running `"docker" "rm" "-f" "e446dbd3bf508e96f5553db40db922ab72e2026839c51caae30b70b5fd0dce28"`
[INFO] [stdout] e446dbd3bf508e96f5553db40db922ab72e2026839c51caae30b70b5fd0dce28