Aug 02 05:54:02.573 INFO checking lab-0.4.3 against 1.27.2+tmplazy for lazy_static-1
Aug 02 05:54:02.573 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:54:02.573 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:54:02.573 INFO running `"docker" "create" "-v" "/tmp/crater.7TV6yVtiti2m:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-6/1.27.2+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 05:54:02.836 INFO blam! e1211d5be397625d9cfb5bf7cc28633e9f7f392cb19846ec7bb1ab86f834c9a0
Aug 02 05:54:02.839 INFO running `"docker" "start" "-a" "e1211d5be397625d9cfb5bf7cc28633e9f7f392cb19846ec7bb1ab86f834c9a0"`
Aug 02 05:54:03.913 INFO kablam!     Checking lab v0.4.3 (file:///source)
Aug 02 05:54:05.033 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 05:54:05.034 INFO kablam!  --> benches/bench.rs:1:1
Aug 02 05:54:05.034 INFO kablam!   |
Aug 02 05:54:05.034 INFO kablam! 1 | #![feature(test)]
Aug 02 05:54:05.034 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 05:54:05.034 INFO kablam! 
Aug 02 05:54:05.034 INFO kablam! error: aborting due to previous error
Aug 02 05:54:05.034 INFO kablam! 
Aug 02 05:54:05.034 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 05:54:05.040 INFO kablam! error: Could not compile `lab`.
Aug 02 05:54:05.040 INFO kablam! 
Aug 02 05:54:05.040 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 05:54:05.041 INFO kablam! su: No module specific data is present
Aug 02 05:54:05.881 INFO running `"docker" "rm" "-f" "e1211d5be397625d9cfb5bf7cc28633e9f7f392cb19846ec7bb1ab86f834c9a0"`
Aug 02 05:54:06.058 INFO blam! e1211d5be397625d9cfb5bf7cc28633e9f7f392cb19846ec7bb1ab86f834c9a0