Aug 01 21:56:48.712 INFO checking smallbitvec-2.1.1 against 1.27.2 for lazy_static-1
Aug 01 21:56:48.712 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:56:48.712 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:56:48.712 INFO running `"docker" "create" "-v" "/tmp/crater.T25P7Bs6xzXY:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-4/1.27.2:/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 01 21:56:48.946 INFO blam! 804b8681ba50bd14e0434629b626934ea9796d816fbf028a2e342093b7e14255
Aug 01 21:56:48.949 INFO running `"docker" "start" "-a" "804b8681ba50bd14e0434629b626934ea9796d816fbf028a2e342093b7e14255"`
Aug 01 21:56:49.839 INFO kablam!     Checking smallbitvec v2.1.1 (file:///source)
Aug 01 21:56:51.523 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:56:51.523 INFO kablam!   --> benches/bench.rs:12:1
Aug 01 21:56:51.523 INFO kablam!    |
Aug 01 21:56:51.523 INFO kablam! 12 | #![feature(test)]
Aug 01 21:56:51.523 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 01 21:56:51.523 INFO kablam! 
Aug 01 21:56:51.524 INFO kablam! error: aborting due to previous error
Aug 01 21:56:51.524 INFO kablam! 
Aug 01 21:56:51.524 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:56:51.531 INFO kablam! error: Could not compile `smallbitvec`.
Aug 01 21:56:51.531 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 21:56:52.056 INFO kablam! error: build failed
Aug 01 21:56:52.058 INFO kablam! su: No module specific data is present
Aug 01 21:56:52.698 INFO running `"docker" "rm" "-f" "804b8681ba50bd14e0434629b626934ea9796d816fbf028a2e342093b7e14255"`
Aug 01 21:56:52.860 INFO blam! 804b8681ba50bd14e0434629b626934ea9796d816fbf028a2e342093b7e14255