Aug 02 14:22:05.389 INFO checking base64-0.9.2 against 1.27.2 for lazy_static-1
Aug 02 14:22:05.389 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:22:05.389 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:22:05.390 INFO running `"docker" "create" "-v" "/tmp/crater.v9ZZyZMfyth9:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2:/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 14:22:05.563 INFO blam! 4724c4b13a3c0e246d861765ad352bf2209481e133d9dc6109b00fd828c38ace
Aug 02 14:22:05.564 INFO running `"docker" "start" "-a" "4724c4b13a3c0e246d861765ad352bf2209481e133d9dc6109b00fd828c38ace"`
Aug 02 14:22:06.751 INFO kablam!     Checking base64 v0.9.2 (file:///source)
Aug 02 14:22:10.694 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 14:22:10.694 INFO kablam!  --> benches/benchmarks.rs:1:1
Aug 02 14:22:10.694 INFO kablam!   |
Aug 02 14:22:10.695 INFO kablam! 1 | #![feature(test)]
Aug 02 14:22:10.695 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 14:22:10.695 INFO kablam! 
Aug 02 14:22:10.696 INFO kablam! error: aborting due to previous error
Aug 02 14:22:10.696 INFO kablam! 
Aug 02 14:22:10.696 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 14:22:10.725 INFO kablam! error: Could not compile `base64`.
Aug 02 14:22:10.725 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 14:22:11.561 INFO kablam! error: build failed
Aug 02 14:22:11.564 INFO kablam! su: No module specific data is present
Aug 02 14:22:12.317 INFO running `"docker" "rm" "-f" "4724c4b13a3c0e246d861765ad352bf2209481e133d9dc6109b00fd828c38ace"`
Aug 02 14:22:12.451 INFO blam! 4724c4b13a3c0e246d861765ad352bf2209481e133d9dc6109b00fd828c38ace