Aug 02 01:22:30.943 INFO checking random_choice-0.3.2 against 1.27.2 for lazy_static-1
Aug 02 01:22:30.943 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:22:30.943 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:22:30.944 INFO running `"docker" "create" "-v" "/tmp/crater.Vv54ZLa8TxhL:/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 01:22:31.187 INFO blam! 3af03f91ef6e4871bf93f60af223a83fcf2538c11887b5fa40ded02441e2c1f8
Aug 02 01:22:31.190 INFO running `"docker" "start" "-a" "3af03f91ef6e4871bf93f60af223a83fcf2538c11887b5fa40ded02441e2c1f8"`
Aug 02 01:22:32.672 INFO kablam!     Checking random_choice v0.3.2 (file:///source)
Aug 02 01:22:34.345 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 01:22:34.345 INFO kablam!  --> benches/lib.rs:1:19
Aug 02 01:22:34.345 INFO kablam!   |
Aug 02 01:22:34.345 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 01:22:34.345 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 01:22:34.347 INFO kablam! 
Aug 02 01:22:34.347 INFO kablam! error: aborting due to previous error
Aug 02 01:22:34.347 INFO kablam! 
Aug 02 01:22:34.348 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 01:22:34.355 INFO kablam! error: Could not compile `random_choice`.
Aug 02 01:22:34.355 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 01:22:34.694 INFO kablam! error: build failed
Aug 02 01:22:34.696 INFO kablam! su: No module specific data is present
Aug 02 01:22:35.455 INFO running `"docker" "rm" "-f" "3af03f91ef6e4871bf93f60af223a83fcf2538c11887b5fa40ded02441e2c1f8"`
Aug 02 01:22:35.680 INFO blam! 3af03f91ef6e4871bf93f60af223a83fcf2538c11887b5fa40ded02441e2c1f8