Nov 01 20:23:46.945 INFO testing JosephFerano/rust_os against 1.30.0 for beta-1.31-1
Nov 01 20:23:46.945 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-1/worker-4/1.30.0:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/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 01 20:23:47.495 INFO blam! b9fb3b96790cd37c89dad45e1f2677142aa321b5e0d2190b943fe885f4c840da
Nov 01 20:23:47.496 INFO running `"docker" "start" "-a" "b9fb3b96790cd37c89dad45e1f2677142aa321b5e0d2190b943fe885f4c840da"`
Nov 01 20:23:48.695 INFO kablam! usermod: no changes
Nov 01 20:23:48.760 INFO kablam!    Compiling multiboot2 v0.7.1
Nov 01 20:23:49.547 INFO kablam!    Compiling first_os v0.1.0 (/source)
Nov 01 20:23:49.699 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Nov 01 20:23:49.699 INFO kablam!  --> src/lib.rs:1:1
Nov 01 20:23:49.699 INFO kablam!   |
Nov 01 20:23:49.699 INFO kablam! 1 | #![feature(lang_items)]
Nov 01 20:23:49.699 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^
Nov 01 20:23:49.699 INFO kablam! 
Nov 01 20:23:49.699 INFO kablam! error: aborting due to previous error
Nov 01 20:23:49.699 INFO kablam! 
Nov 01 20:23:49.699 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Nov 01 20:23:49.707 INFO kablam! error: Could not compile `first_os`.
Nov 01 20:23:49.707 INFO kablam! 
Nov 01 20:23:49.707 INFO kablam! To learn more, run the command again with --verbose.
Nov 01 20:23:49.707 INFO kablam! su: No module specific data is present
Nov 01 20:23:50.205 INFO running `"docker" "rm" "-f" "b9fb3b96790cd37c89dad45e1f2677142aa321b5e0d2190b943fe885f4c840da"`
Nov 01 20:23:50.503 INFO blam! b9fb3b96790cd37c89dad45e1f2677142aa321b5e0d2190b943fe885f4c840da
