Nov 02 00:10:10.699 INFO checking csv_challenge-0.1.0 against try#d7816399d50d407bbce1efe9dbadf8faaaf568fc for pr-55538
Nov 02 00:10:10.699 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-55538/worker-7/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/pr-55538/try#d7816399d50d407bbce1efe9dbadf8faaaf568fc:/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 +d7816399d50d407bbce1efe9dbadf8faaaf568fc-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 02 00:10:10.968 INFO blam! e5c0516dc1212d387289905f77d844234c965b7949a5d2be68e561bb4a5e4bf2
Nov 02 00:10:10.974 INFO running `"docker" "start" "-a" "e5c0516dc1212d387289905f77d844234c965b7949a5d2be68e561bb4a5e4bf2"`
Nov 02 00:10:11.618 INFO kablam! usermod: no changes
Nov 02 00:10:11.681 INFO kablam!     Checking csv_challenge v0.1.0 (/source)
Nov 02 00:10:13.220 INFO kablam! warning: unused variable: `filename`
Nov 02 00:10:13.220 INFO kablam!   --> src/core/read.rs:68:13
Nov 02 00:10:13.220 INFO kablam!    |
Nov 02 00:10:13.220 INFO kablam! 68 |         let filename = PathBuf::from("./input/challenge.csv");
Nov 02 00:10:13.220 INFO kablam!    |             ^^^^^^^^ help: consider using `_filename` instead
Nov 02 00:10:13.220 INFO kablam!    |
Nov 02 00:10:13.220 INFO kablam!    = note: #[warn(unused_variables)] on by default
Nov 02 00:10:13.220 INFO kablam! 
Nov 02 00:10:16.721 INFO kablam! warning: unused import: `Opt`
Nov 02 00:10:16.723 INFO kablam!  --> tests/integration_test.rs:6:9
Nov 02 00:10:16.724 INFO kablam!   |
Nov 02 00:10:16.744 INFO kablam! 6 |         Opt,
Nov 02 00:10:16.745 INFO kablam!   |         ^^^
Nov 02 00:10:16.745 INFO kablam!   |
Nov 02 00:10:16.745 INFO kablam!   = note: #[warn(unused_imports)] on by default
Nov 02 00:10:16.746 INFO kablam! 
Nov 02 00:10:16.797 INFO kablam! error[E0658]: use of extern prelude names introduced with `extern crate` items is unstable (see issue #54658)
Nov 02 00:10:16.797 INFO kablam!  --> benches/file_op_bench.rs:3:5
Nov 02 00:10:16.798 INFO kablam!   |
Nov 02 00:10:16.798 INFO kablam! 3 | use test::Bencher;
Nov 02 00:10:16.798 INFO kablam!   |     ^^^^
Nov 02 00:10:16.798 INFO kablam!   |
Nov 02 00:10:16.799 INFO kablam!   = help: add #![feature(extern_crate_item_prelude)] to the crate attributes to enable
Nov 02 00:10:16.799 INFO kablam! 
Nov 02 00:10:16.799 INFO kablam! warning: unused import: `Opt`
Nov 02 00:10:16.800 INFO kablam!  --> benches/file_op_bench.rs:6:5
Nov 02 00:10:16.800 INFO kablam!   |
Nov 02 00:10:16.800 INFO kablam! 6 |     Opt,
Nov 02 00:10:16.800 INFO kablam!   |     ^^^
Nov 02 00:10:16.801 INFO kablam!   |
Nov 02 00:10:16.801 INFO kablam!   = note: #[warn(unused_imports)] on by default
Nov 02 00:10:16.801 INFO kablam! 
Nov 02 00:10:16.840 INFO kablam! error: aborting due to previous error
Nov 02 00:10:16.840 INFO kablam! 
Nov 02 00:10:16.840 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Nov 02 00:10:16.866 INFO kablam! error: Could not compile `csv_challenge`.
Nov 02 00:10:16.867 INFO kablam! warning: build failed, waiting for other jobs to finish...
Nov 02 00:10:16.960 INFO kablam! error: build failed
Nov 02 00:10:16.962 INFO kablam! su: No module specific data is present
Nov 02 00:10:17.350 INFO running `"docker" "rm" "-f" "e5c0516dc1212d387289905f77d844234c965b7949a5d2be68e561bb4a5e4bf2"`
Nov 02 00:10:17.465 INFO blam! e5c0516dc1212d387289905f77d844234c965b7949a5d2be68e561bb4a5e4bf2