Nov 30 00:59:22.397 INFO checking jfredett/synacor against master#a49316ddc99d9d595193557fc899f6c52e4d9af9 for pr-56323
Nov 30 00:59:22.397 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-1/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56323/master#a49316ddc99d9d595193557fc899f6c52e4d9af9:/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 +a49316ddc99d9d595193557fc899f6c52e4d9af9-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"`
Nov 30 00:59:22.612 INFO [stdout] a8f01e8ad0d4957a480e0171513086d51166d09b3274f976a8c23075a5a378bc
Nov 30 00:59:22.614 INFO running `"docker" "start" "-a" "a8f01e8ad0d4957a480e0171513086d51166d09b3274f976a8c23075a5a378bc"`
Nov 30 00:59:23.736 INFO [stderr] usermod: no changes
Nov 30 00:59:23.920 INFO [stderr]     Checking clap v2.29.0
Nov 30 00:59:30.880 INFO [stderr]     Checking synacor v0.1.0 (/source)
Nov 30 00:59:31.456 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 30 00:59:31.456 INFO [stderr]    --> src/vm.rs:186:9
Nov 30 00:59:31.456 INFO [stderr]     |
Nov 30 00:59:31.456 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Nov 30 00:59:31.456 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 00:59:31.456 INFO [stderr]     |
Nov 30 00:59:31.456 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 30 00:59:31.456 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 30 00:59:31.456 INFO [stderr] 
Nov 30 00:59:35.340 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 30 00:59:35.340 INFO [stderr]    --> src/u15.rs:163:30
Nov 30 00:59:35.340 INFO [stderr]     |
Nov 30 00:59:35.340 INFO [stderr] 163 |         fn sub_underflow() { u15(0) - u15(2); }
Nov 30 00:59:35.340 INFO [stderr]     |                              ^^^^^^^^^^^^^^^
Nov 30 00:59:35.340 INFO [stderr]     |
Nov 30 00:59:35.340 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 30 00:59:35.340 INFO [stderr] 
Nov 30 00:59:35.340 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 30 00:59:35.340 INFO [stderr]    --> src/u15.rs:167:28
Nov 30 00:59:35.340 INFO [stderr]     |
Nov 30 00:59:35.340 INFO [stderr] 167 |         fn div_by_zero() { u15(1) / u15(0); }
Nov 30 00:59:35.340 INFO [stderr]     |                            ^^^^^^^^^^^^^^^
Nov 30 00:59:35.340 INFO [stderr] 
Nov 30 00:59:35.360 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 30 00:59:35.360 INFO [stderr]    --> src/u15.rs:223:26
Nov 30 00:59:35.360 INFO [stderr]     |
Nov 30 00:59:35.360 INFO [stderr] 223 |         fn sub_panic() { u15(16) - u15(17); }
Nov 30 00:59:35.360 INFO [stderr]     |                          ^^^^^^^^^^^^^^^^^
Nov 30 00:59:35.360 INFO [stderr] 
Nov 30 00:59:35.438 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 30 00:59:35.438 INFO [stderr]    --> src/vm.rs:186:9
Nov 30 00:59:35.438 INFO [stderr]     |
Nov 30 00:59:35.438 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Nov 30 00:59:35.438 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 30 00:59:35.438 INFO [stderr]     |
Nov 30 00:59:35.438 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 30 00:59:35.438 INFO [stderr] 
Nov 30 00:59:35.552 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.77s
Nov 30 00:59:35.560 INFO [stderr] su: No module specific data is present
Nov 30 00:59:36.428 INFO running `"docker" "inspect" "a8f01e8ad0d4957a480e0171513086d51166d09b3274f976a8c23075a5a378bc"`
Nov 30 00:59:36.778 INFO running `"docker" "rm" "-f" "a8f01e8ad0d4957a480e0171513086d51166d09b3274f976a8c23075a5a378bc"`
Nov 30 00:59:37.008 INFO [stdout] a8f01e8ad0d4957a480e0171513086d51166d09b3274f976a8c23075a5a378bc