Nov 01 21:08:36.976 INFO testing GGalizzi/composite against 1.30.0 for beta-1.31-1
Nov 01 21:08:36.976 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"`
Nov 01 21:08:37.174 INFO blam! 7678f75e089f7c96511e7fabcbf378bf318189089fe4651a3c6b9cbddadbfc90
Nov 01 21:08:37.179 INFO running `"docker" "start" "-a" "7678f75e089f7c96511e7fabcbf378bf318189089fe4651a3c6b9cbddadbfc90"`
Nov 01 21:08:37.775 INFO kablam! usermod: no changes
Nov 01 21:08:37.799 INFO kablam!    Compiling composite v0.1.0 (/source)
Nov 01 21:08:38.212 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Nov 01 21:08:38.212 INFO kablam!  --> src/lib.rs:5:1
Nov 01 21:08:38.213 INFO kablam!   |
Nov 01 21:08:38.213 INFO kablam! 5 | #![feature(append,drain)]
Nov 01 21:08:38.213 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 01 21:08:38.214 INFO kablam! 
Nov 01 21:08:38.215 INFO kablam! error: aborting due to previous error
Nov 01 21:08:38.215 INFO kablam! 
Nov 01 21:08:38.217 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Nov 01 21:08:38.219 INFO kablam! error: Could not compile `composite`.
Nov 01 21:08:38.220 INFO kablam! 
Nov 01 21:08:38.220 INFO kablam! To learn more, run the command again with --verbose.
Nov 01 21:08:38.220 INFO kablam! su: No module specific data is present
Nov 01 21:08:38.533 INFO running `"docker" "rm" "-f" "7678f75e089f7c96511e7fabcbf378bf318189089fe4651a3c6b9cbddadbfc90"`
Nov 01 21:08:38.715 INFO blam! 7678f75e089f7c96511e7fabcbf378bf318189089fe4651a3c6b9cbddadbfc90
