Dec 19 06:21:56.957 INFO checking upenn-cis198-2018f/Lecture6 against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 06:21:56.957 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-6/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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=forbid" "-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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 06:21:57.145 INFO [stdout] 4064a972375254c9a20fde060ade30dbe7b171efe6d09e8cb37b4c7a57f4e58a
Dec 19 06:21:57.147 INFO running `"docker" "start" "-a" "4064a972375254c9a20fde060ade30dbe7b171efe6d09e8cb37b4c7a57f4e58a"`
Dec 19 06:21:58.035 INFO [stderr]     Checking lecture6 v0.1.0 (/opt/crater/workdir)
Dec 19 06:21:58.288 INFO [stderr] warning: unused import: `std::fmt::Display`
Dec 19 06:21:58.288 INFO [stderr]  --> src/generics.rs:4:5
Dec 19 06:21:58.288 INFO [stderr]   |
Dec 19 06:21:58.288 INFO [stderr] 4 | use std::fmt::Display;
Dec 19 06:21:58.288 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^
Dec 19 06:21:58.288 INFO [stderr]   |
Dec 19 06:21:58.288 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:21:58.288 INFO [stderr] 
Dec 19 06:21:58.310 INFO [stderr] warning: unused import: `std::fmt::Display`
Dec 19 06:21:58.310 INFO [stderr]  --> src/generics.rs:4:5
Dec 19 06:21:58.310 INFO [stderr]   |
Dec 19 06:21:58.310 INFO [stderr] 4 | use std::fmt::Display;
Dec 19 06:21:58.310 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^
Dec 19 06:21:58.310 INFO [stderr]   |
Dec 19 06:21:58.310 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:21:58.310 INFO [stderr] 
Dec 19 06:21:58.348 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
Dec 19 06:21:58.952 INFO running `"docker" "inspect" "4064a972375254c9a20fde060ade30dbe7b171efe6d09e8cb37b4c7a57f4e58a"`
Dec 19 06:21:59.073 INFO running `"docker" "rm" "-f" "4064a972375254c9a20fde060ade30dbe7b171efe6d09e8cb37b4c7a57f4e58a"`
Dec 19 06:21:59.216 INFO [stdout] 4064a972375254c9a20fde060ade30dbe7b171efe6d09e8cb37b4c7a57f4e58a