Oct 12 12:38:12.466 INFO checking taku-shimomura/building_vm against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 12 12:38:12.466 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-5/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-5/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 12:38:12.886 INFO blam! 4492aff16f56be8f5607643d99190a008b3413cd44affcf9a0c84214dca9e464
Oct 12 12:38:12.887 INFO running `"docker" "start" "-a" "4492aff16f56be8f5607643d99190a008b3413cd44affcf9a0c84214dca9e464"`
Oct 12 12:38:13.819 INFO kablam! usermod: no changes
Oct 12 12:38:13.888 INFO kablam!     Checking building_vm v0.1.0 (/source)
Oct 12 12:38:14.224 INFO kablam! warning: field is never used: `registers`
Oct 12 12:38:14.224 INFO kablam!  --> src/vm.rs:2:5
Oct 12 12:38:14.224 INFO kablam!   |
Oct 12 12:38:14.224 INFO kablam! 2 |     registers: [i32; 32]
Oct 12 12:38:14.225 INFO kablam!   |     ^^^^^^^^^^^^^^^^^^^^
Oct 12 12:38:14.225 INFO kablam!   |
Oct 12 12:38:14.225 INFO kablam!   = note: #[warn(dead_code)] on by default
Oct 12 12:38:14.225 INFO kablam! 
Oct 12 12:38:14.322 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
Oct 12 12:38:14.322 INFO kablam! su: No module specific data is present
Oct 12 12:38:14.853 INFO running `"docker" "rm" "-f" "4492aff16f56be8f5607643d99190a008b3413cd44affcf9a0c84214dca9e464"`
Oct 12 12:38:15.176 INFO blam! 4492aff16f56be8f5607643d99190a008b3413cd44affcf9a0c84214dca9e464