Oct 12 19:49:24.462 INFO checking jfredett/synacor against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 12 19:49:24.464 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-0/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-0/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/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 +4021bd0b3c5815b087d6db10ce461e7e4854ade7-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"`
Oct 12 19:49:24.726 INFO blam! 3c6bbe53036f84b67b8371eb9978c1afc4253db8eae88b6da057d482a98f3e73
Oct 12 19:49:24.727 INFO running `"docker" "start" "-a" "3c6bbe53036f84b67b8371eb9978c1afc4253db8eae88b6da057d482a98f3e73"`
Oct 12 19:49:25.543 INFO kablam! usermod: no changes
Oct 12 19:49:25.634 INFO kablam!     Checking synacor v0.1.0 (/source)
Oct 12 19:49:26.941 INFO kablam! warning: unused `std::result::Result` which must be used
Oct 12 19:49:26.941 INFO kablam!    --> src/vm.rs:186:9
Oct 12 19:49:26.942 INFO kablam!     |
Oct 12 19:49:26.942 INFO kablam! 186 |         stdin.read_exact(&mut buf);
Oct 12 19:49:26.942 INFO kablam!     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 12 19:49:26.942 INFO kablam!     |
Oct 12 19:49:26.943 INFO kablam!     = note: #[warn(unused_must_use)] on by default
Oct 12 19:49:26.943 INFO kablam!     = note: this `Result` may be an `Err` variant, which should be handled
Oct 12 19:49:26.943 INFO kablam! 
Oct 12 19:49:29.411 INFO kablam! warning: unused arithmetic operation which must be used
Oct 12 19:49:29.411 INFO kablam!    --> src/u15.rs:163:30
Oct 12 19:49:29.411 INFO kablam!     |
Oct 12 19:49:29.411 INFO kablam! 163 |         fn sub_underflow() { u15(0) - u15(2); }
Oct 12 19:49:29.411 INFO kablam!     |                              ^^^^^^^^^^^^^^^
Oct 12 19:49:29.411 INFO kablam!     |
Oct 12 19:49:29.411 INFO kablam!     = note: #[warn(unused_must_use)] on by default
Oct 12 19:49:29.411 INFO kablam! 
Oct 12 19:49:29.411 INFO kablam! warning: unused arithmetic operation which must be used
Oct 12 19:49:29.411 INFO kablam!    --> src/u15.rs:167:28
Oct 12 19:49:29.411 INFO kablam!     |
Oct 12 19:49:29.411 INFO kablam! 167 |         fn div_by_zero() { u15(1) / u15(0); }
Oct 12 19:49:29.411 INFO kablam!     |                            ^^^^^^^^^^^^^^^
Oct 12 19:49:29.411 INFO kablam! 
Oct 12 19:49:29.411 INFO kablam! warning: unused arithmetic operation which must be used
Oct 12 19:49:29.411 INFO kablam!    --> src/u15.rs:223:26
Oct 12 19:49:29.411 INFO kablam!     |
Oct 12 19:49:29.411 INFO kablam! 223 |         fn sub_panic() { u15(16) - u15(17); }
Oct 12 19:49:29.411 INFO kablam!     |                          ^^^^^^^^^^^^^^^^^
Oct 12 19:49:29.411 INFO kablam! 
Oct 12 19:49:29.505 INFO kablam! warning: unused `std::result::Result` which must be used
Oct 12 19:49:29.505 INFO kablam!    --> src/vm.rs:186:9
Oct 12 19:49:29.505 INFO kablam!     |
Oct 12 19:49:29.505 INFO kablam! 186 |         stdin.read_exact(&mut buf);
Oct 12 19:49:29.505 INFO kablam!     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Oct 12 19:49:29.505 INFO kablam!     |
Oct 12 19:49:29.505 INFO kablam!     = note: this `Result` may be an `Err` variant, which should be handled
Oct 12 19:49:29.505 INFO kablam! 
Oct 12 19:49:29.629 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 4.06s
Oct 12 19:49:29.633 INFO kablam! su: No module specific data is present
Oct 12 19:49:30.006 INFO running `"docker" "rm" "-f" "3c6bbe53036f84b67b8371eb9978c1afc4253db8eae88b6da057d482a98f3e73"`
Oct 12 19:49:30.093 INFO blam! 3c6bbe53036f84b67b8371eb9978c1afc4253db8eae88b6da057d482a98f3e73