Aug 02 12:27:50.396 INFO checking cons-list-0.0.3 against 1.27.2 for lazy_static-1
Aug 02 12:27:50.396 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 12:27:50.396 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 12:27:50.396 INFO running `"docker" "create" "-v" "/tmp/crater.kWuAuZGo65Z4:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home/git:/cargo-home/git:rw,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +1.27.2 check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "crater"`
Aug 02 12:27:50.609 INFO blam! c99f95ea4d09ceddfb0f3474618be6a4aa92c2053c35aa6b4cbd0607af855744
Aug 02 12:27:50.611 INFO running `"docker" "start" "-a" "c99f95ea4d09ceddfb0f3474618be6a4aa92c2053c35aa6b4cbd0607af855744"`
Aug 02 12:27:52.060 INFO kablam!     Checking cons-list v0.0.3 (file:///source)
Aug 02 12:27:52.780 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 12:27:52.780 INFO kablam!   --> src/lib.rs:13:19
Aug 02 12:27:52.781 INFO kablam!    |
Aug 02 12:27:52.781 INFO kablam! 13 | #![cfg_attr(test, feature(test))]
Aug 02 12:27:52.781 INFO kablam!    |                   ^^^^^^^^^^^^^^
Aug 02 12:27:52.781 INFO kablam! 
Aug 02 12:27:52.783 INFO kablam! error: aborting due to previous error
Aug 02 12:27:52.783 INFO kablam! 
Aug 02 12:27:52.783 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 12:27:52.795 INFO kablam! error: Could not compile `cons-list`.
Aug 02 12:27:52.796 INFO kablam! 
Aug 02 12:27:52.796 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 12:27:52.798 INFO kablam! su: No module specific data is present
Aug 02 12:27:53.739 INFO running `"docker" "rm" "-f" "c99f95ea4d09ceddfb0f3474618be6a4aa92c2053c35aa6b4cbd0607af855744"`
Aug 02 12:27:53.923 INFO blam! c99f95ea4d09ceddfb0f3474618be6a4aa92c2053c35aa6b4cbd0607af855744