Nov 28 03:22:53.277 INFO checking jfredett/synacor against try#db42d4dad33013eba11ef37342ad9f614e5652b8 for pr-56074
Nov 28 03:22:53.277 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-1/try#db42d4dad33013eba11ef37342ad9f614e5652b8:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56074/try#db42d4dad33013eba11ef37342ad9f614e5652b8:/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 +db42d4dad33013eba11ef37342ad9f614e5652b8-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 28 03:22:53.676 INFO [stdout] 69b74639467470f8de3d158e272d25ad257b8a978de130e991b0a910cbc25d67
Nov 28 03:22:53.678 INFO running `"docker" "start" "-a" "69b74639467470f8de3d158e272d25ad257b8a978de130e991b0a910cbc25d67"`
Nov 28 03:22:54.715 INFO [stderr] usermod: no changes
Nov 28 03:22:54.798 INFO [stderr]     Checking synacor v0.1.0 (/source)
Nov 28 03:22:56.020 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 03:22:56.021 INFO [stderr]    --> src/vm.rs:186:9
Nov 28 03:22:56.022 INFO [stderr]     |
Nov 28 03:22:56.022 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Nov 28 03:22:56.023 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 03:22:56.024 INFO [stderr]     |
Nov 28 03:22:56.024 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 03:22:56.025 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 03:22:56.025 INFO [stderr] 
Nov 28 03:22:59.402 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 28 03:22:59.402 INFO [stderr]    --> src/u15.rs:163:30
Nov 28 03:22:59.402 INFO [stderr]     |
Nov 28 03:22:59.402 INFO [stderr] 163 |         fn sub_underflow() { u15(0) - u15(2); }
Nov 28 03:22:59.402 INFO [stderr]     |                              ^^^^^^^^^^^^^^^
Nov 28 03:22:59.402 INFO [stderr]     |
Nov 28 03:22:59.402 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 28 03:22:59.402 INFO [stderr] 
Nov 28 03:22:59.402 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 28 03:22:59.402 INFO [stderr]    --> src/u15.rs:167:28
Nov 28 03:22:59.402 INFO [stderr]     |
Nov 28 03:22:59.402 INFO [stderr] 167 |         fn div_by_zero() { u15(1) / u15(0); }
Nov 28 03:22:59.402 INFO [stderr]     |                            ^^^^^^^^^^^^^^^
Nov 28 03:22:59.402 INFO [stderr] 
Nov 28 03:22:59.403 INFO [stderr] warning: unused arithmetic operation that must be used
Nov 28 03:22:59.403 INFO [stderr]    --> src/u15.rs:223:26
Nov 28 03:22:59.403 INFO [stderr]     |
Nov 28 03:22:59.403 INFO [stderr] 223 |         fn sub_panic() { u15(16) - u15(17); }
Nov 28 03:22:59.403 INFO [stderr]     |                          ^^^^^^^^^^^^^^^^^
Nov 28 03:22:59.404 INFO [stderr] 
Nov 28 03:22:59.460 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 28 03:22:59.460 INFO [stderr]    --> src/vm.rs:186:9
Nov 28 03:22:59.460 INFO [stderr]     |
Nov 28 03:22:59.460 INFO [stderr] 186 |         stdin.read_exact(&mut buf);
Nov 28 03:22:59.460 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 03:22:59.460 INFO [stderr]     |
Nov 28 03:22:59.460 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 28 03:22:59.460 INFO [stderr] 
Nov 28 03:22:59.521 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.77s
Nov 28 03:22:59.526 INFO [stderr] su: No module specific data is present
Nov 28 03:22:59.915 INFO running `"docker" "inspect" "69b74639467470f8de3d158e272d25ad257b8a978de130e991b0a910cbc25d67"`
Nov 28 03:23:00.007 INFO running `"docker" "rm" "-f" "69b74639467470f8de3d158e272d25ad257b8a978de130e991b0a910cbc25d67"`
Nov 28 03:23:00.158 INFO [stdout] 69b74639467470f8de3d158e272d25ad257b8a978de130e991b0a910cbc25d67