Oct 13 09:18:45.366 INFO checking rust-mpfr-0.1.7 against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 13 09:18:45.366 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 13 09:18:45.741 INFO blam! cb7562cdbf029bbba13a36a7a59243e9dfa60d67420059f1fbf70c772ff47601
Oct 13 09:18:45.753 INFO running `"docker" "start" "-a" "cb7562cdbf029bbba13a36a7a59243e9dfa60d67420059f1fbf70c772ff47601"`
Oct 13 09:18:46.300 INFO kablam! usermod: no changes
Oct 13 09:18:46.333 INFO kablam!     Checking rust-mpfr v0.1.7 (/source)
Oct 13 09:18:47.250 INFO kablam! warning: unused arithmetic operation which must be used
Oct 13 09:18:47.250 INFO kablam!   --> src/test.rs:42:5
Oct 13 09:18:47.250 INFO kablam!    |
Oct 13 09:18:47.250 INFO kablam! 42 |     x / y;
Oct 13 09:18:47.250 INFO kablam!    |     ^^^^^
Oct 13 09:18:47.250 INFO kablam!    |
Oct 13 09:18:47.250 INFO kablam!    = note: #[warn(unused_must_use)] on by default
Oct 13 09:18:47.250 INFO kablam! 
Oct 13 09:18:47.283 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
Oct 13 09:18:47.287 INFO kablam! su: No module specific data is present
Oct 13 09:18:47.748 INFO running `"docker" "rm" "-f" "cb7562cdbf029bbba13a36a7a59243e9dfa60d67420059f1fbf70c772ff47601"`
Oct 13 09:18:48.080 INFO blam! cb7562cdbf029bbba13a36a7a59243e9dfa60d67420059f1fbf70c772ff47601