Aug 02 03:20:38.888 INFO checking num-integer-0.1.39 against 1.27.2 for lazy_static-1
Aug 02 03:20:38.888 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:20:38.888 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:20:38.888 INFO running `"docker" "create" "-v" "/tmp/crater.1vwfQGpnRBWq:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 03:20:39.075 INFO blam! d97f102257973843b30432705a77319b1bf386eb28577c01a615fa41113ab585
Aug 02 03:20:39.075 INFO running `"docker" "start" "-a" "d97f102257973843b30432705a77319b1bf386eb28577c01a615fa41113ab585"`
Aug 02 03:20:40.160 INFO kablam!    Compiling num-integer v0.1.39 (file:///source)
Aug 02 03:20:43.987 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 03:20:43.987 INFO kablam!  --> benches/roots.rs:3:1
Aug 02 03:20:43.987 INFO kablam!   |
Aug 02 03:20:43.987 INFO kablam! 3 | #![feature(test)]
Aug 02 03:20:43.987 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 03:20:43.987 INFO kablam! 
Aug 02 03:20:43.988 INFO kablam! error: aborting due to previous error
Aug 02 03:20:43.988 INFO kablam! 
Aug 02 03:20:43.988 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 03:20:43.995 INFO kablam! error: Could not compile `num-integer`.
Aug 02 03:20:43.995 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 03:20:49.436 INFO kablam! error: build failed
Aug 02 03:20:49.437 INFO kablam! su: No module specific data is present
Aug 02 03:20:50.261 INFO running `"docker" "rm" "-f" "d97f102257973843b30432705a77319b1bf386eb28577c01a615fa41113ab585"`
Aug 02 03:20:50.419 INFO blam! d97f102257973843b30432705a77319b1bf386eb28577c01a615fa41113ab585