Aug 02 12:49:15.416 INFO checking classifier-measures-0.4.3 against 1.27.2+tmplazy for lazy_static-1
Aug 02 12:49:15.416 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 12:49:15.416 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 12:49:15.416 INFO running `"docker" "create" "-v" "/tmp/crater.fB8vXIke8Vp4:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2+tmplazy:/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 12:49:15.675 INFO blam! f7e8fe73474eded369e71e7429b0ad659b8bea1a891017f69020a570af771180
Aug 02 12:49:15.677 INFO running `"docker" "start" "-a" "f7e8fe73474eded369e71e7429b0ad659b8bea1a891017f69020a570af771180"`
Aug 02 12:49:17.442 INFO kablam!     Checking classifier-measures v0.4.3 (file:///source)
Aug 02 12:49:19.784 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 12:49:19.785 INFO kablam!  --> benches/bench.rs:1:1
Aug 02 12:49:19.785 INFO kablam!   |
Aug 02 12:49:19.785 INFO kablam! 1 | #![feature(test)]
Aug 02 12:49:19.785 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 12:49:19.785 INFO kablam! 
Aug 02 12:49:19.792 INFO kablam! error: aborting due to previous error
Aug 02 12:49:19.792 INFO kablam! 
Aug 02 12:49:19.792 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 12:49:19.818 INFO kablam! error: Could not compile `classifier-measures`.
Aug 02 12:49:19.818 INFO kablam! 
Aug 02 12:49:19.818 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 12:49:19.837 INFO kablam! su: No module specific data is present
Aug 02 12:49:20.545 INFO running `"docker" "rm" "-f" "f7e8fe73474eded369e71e7429b0ad659b8bea1a891017f69020a570af771180"`
Aug 02 12:49:20.645 INFO blam! f7e8fe73474eded369e71e7429b0ad659b8bea1a891017f69020a570af771180