Dec 04 16:41:09.261 INFO checking jfredett/synacor against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 04 16:41:09.261 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-2/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1df97983eb2057dc6a8f7eb364e263b51ae23230-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 04 16:41:10.415 INFO [stdout] 1c9c439733079bde65a5a393f05b3a27fcb8ac5bf29180f42340bde2b1af5a5e
Dec 04 16:41:10.421 INFO running `"docker" "start" "-a" "1c9c439733079bde65a5a393f05b3a27fcb8ac5bf29180f42340bde2b1af5a5e"`
Dec 04 16:41:10.959 INFO [stderr] usermod: no changes
Dec 04 16:41:11.035 INFO [stderr]     Checking synacor v0.1.0 (/source)
Dec 04 16:41:12.301 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 04 16:41:12.301 INFO [stderr]    --> src/vm.rs:186:9
Dec 04 16:41:12.301 INFO [stderr]     |
Dec 04 16:41:12.302 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Dec 04 16:41:12.302 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 04 16:41:12.302 INFO [stderr]     |
Dec 04 16:41:12.303 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 04 16:41:12.303 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 04 16:41:12.303 INFO [stderr] 
Dec 04 16:41:16.671 INFO [stderr] warning: unused arithmetic operation that must be used
Dec 04 16:41:16.671 INFO [stderr]    --> src/u15.rs:163:30
Dec 04 16:41:16.671 INFO [stderr]     |
Dec 04 16:41:16.671 INFO [stderr] 163 |         fn sub_underflow() { u15(0) - u15(2); }
Dec 04 16:41:16.671 INFO [stderr]     |                              ^^^^^^^^^^^^^^^
Dec 04 16:41:16.671 INFO [stderr]     |
Dec 04 16:41:16.671 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 04 16:41:16.671 INFO [stderr] 
Dec 04 16:41:16.671 INFO [stderr] warning: unused arithmetic operation that must be used
Dec 04 16:41:16.671 INFO [stderr]    --> src/u15.rs:167:28
Dec 04 16:41:16.671 INFO [stderr]     |
Dec 04 16:41:16.671 INFO [stderr] 167 |         fn div_by_zero() { u15(1) / u15(0); }
Dec 04 16:41:16.671 INFO [stderr]     |                            ^^^^^^^^^^^^^^^
Dec 04 16:41:16.671 INFO [stderr] 
Dec 04 16:41:16.679 INFO [stderr] warning: unused arithmetic operation that must be used
Dec 04 16:41:16.679 INFO [stderr]    --> src/u15.rs:223:26
Dec 04 16:41:16.679 INFO [stderr]     |
Dec 04 16:41:16.679 INFO [stderr] 223 |         fn sub_panic() { u15(16) - u15(17); }
Dec 04 16:41:16.679 INFO [stderr]     |                          ^^^^^^^^^^^^^^^^^
Dec 04 16:41:16.679 INFO [stderr] 
Dec 04 16:41:16.731 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 04 16:41:16.731 INFO [stderr]    --> src/vm.rs:186:9
Dec 04 16:41:16.731 INFO [stderr]     |
Dec 04 16:41:16.731 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Dec 04 16:41:16.731 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 04 16:41:16.731 INFO [stderr]     |
Dec 04 16:41:16.731 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 04 16:41:16.731 INFO [stderr] 
Dec 04 16:41:16.802 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.81s
Dec 04 16:41:16.805 INFO [stderr] su: No module specific data is present
Dec 04 16:41:17.150 INFO running `"docker" "inspect" "1c9c439733079bde65a5a393f05b3a27fcb8ac5bf29180f42340bde2b1af5a5e"`
Dec 04 16:41:17.264 INFO running `"docker" "rm" "-f" "1c9c439733079bde65a5a393f05b3a27fcb8ac5bf29180f42340bde2b1af5a5e"`
Dec 04 16:41:17.385 INFO [stdout] 1c9c439733079bde65a5a393f05b3a27fcb8ac5bf29180f42340bde2b1af5a5e