Nov 02 23:45:56.739 INFO testing combinatorics-0.0.1 against 1.30.0 for beta-1.31-1
Nov 02 23:45:56.739 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-1/worker-2/1.30.0:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/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"`
Nov 02 23:45:57.175 INFO blam! 1c535e02f4b044108705df84a8113ccdbc9dbfbfd40ff62cf641b906508550f7
Nov 02 23:45:57.191 INFO running `"docker" "start" "-a" "1c535e02f4b044108705df84a8113ccdbc9dbfbfd40ff62cf641b906508550f7"`
Nov 02 23:45:59.719 INFO kablam! usermod: no changes
Nov 02 23:45:59.795 INFO kablam!    Compiling combinatorics v0.0.1 (/source)
Nov 02 23:46:00.573 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Nov 02 23:46:00.573 INFO kablam!  --> src/lib.rs:1:1
Nov 02 23:46:00.574 INFO kablam!   |
Nov 02 23:46:00.574 INFO kablam! 1 | #![feature(libc)]
Nov 02 23:46:00.574 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Nov 02 23:46:00.574 INFO kablam! 
Nov 02 23:46:00.575 INFO kablam! error: aborting due to previous error
Nov 02 23:46:00.575 INFO kablam! 
Nov 02 23:46:00.575 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Nov 02 23:46:00.577 INFO kablam! error: Could not compile `combinatorics`.
Nov 02 23:46:00.577 INFO kablam! 
Nov 02 23:46:00.577 INFO kablam! To learn more, run the command again with --verbose.
Nov 02 23:46:00.583 INFO kablam! su: No module specific data is present
Nov 02 23:46:01.805 INFO running `"docker" "rm" "-f" "1c535e02f4b044108705df84a8113ccdbc9dbfbfd40ff62cf641b906508550f7"`
Nov 02 23:46:02.016 INFO blam! 1c535e02f4b044108705df84a8113ccdbc9dbfbfd40ff62cf641b906508550f7
