Oct 31 15:18:50.375 INFO testing yymm/rust-exercise against 1.30.0 for beta-1.31-1
Oct 31 15:18:50.375 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-1/worker-6/1.30.0:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/beta-1.31-1/1.30.0:/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 +1.30.0 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Oct 31 15:18:50.762 INFO blam! a972332dfc6371ab218ba7247b1490726b7d930a022e37eaf29df4d039865b0b
Oct 31 15:18:50.767 INFO running `"docker" "start" "-a" "a972332dfc6371ab218ba7247b1490726b7d930a022e37eaf29df4d039865b0b"`
Oct 31 15:18:52.040 INFO kablam! usermod: no changes
Oct 31 15:18:52.082 INFO kablam!    Compiling exercise v0.1.0 (/source)
Oct 31 15:18:52.269 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Oct 31 15:18:52.270 INFO kablam!  --> src/lib.rs:1:1
Oct 31 15:18:52.271 INFO kablam!   |
Oct 31 15:18:52.271 INFO kablam! 1 | #![feature(test)]
Oct 31 15:18:52.271 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Oct 31 15:18:52.271 INFO kablam! 
Oct 31 15:18:52.271 INFO kablam! error: aborting due to previous error
Oct 31 15:18:52.271 INFO kablam! 
Oct 31 15:18:52.271 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Oct 31 15:18:52.282 INFO kablam! error: Could not compile `exercise`.
Oct 31 15:18:52.282 INFO kablam! 
Oct 31 15:18:52.282 INFO kablam! To learn more, run the command again with --verbose.
Oct 31 15:18:52.284 INFO kablam! su: No module specific data is present
Oct 31 15:18:53.510 INFO running `"docker" "rm" "-f" "a972332dfc6371ab218ba7247b1490726b7d930a022e37eaf29df4d039865b0b"`
Oct 31 15:18:53.788 INFO blam! a972332dfc6371ab218ba7247b1490726b7d930a022e37eaf29df4d039865b0b
