Aug 02 04:25:13.971 INFO checking metrohash-1.0.5 against 1.27.2+tmplazy for lazy_static-1
Aug 02 04:25:13.971 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:25:13.971 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:25:13.971 INFO running `"docker" "create" "-v" "/tmp/crater.PKdJm5tylOeR:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2+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 04:25:14.222 INFO blam! 49b719aea360bb8dcff9a0bff79d48752340d4822f43c1d0d78e0e62dcae9bec
Aug 02 04:25:14.225 INFO running `"docker" "start" "-a" "49b719aea360bb8dcff9a0bff79d48752340d4822f43c1d0d78e0e62dcae9bec"`
Aug 02 04:25:15.330 INFO kablam!     Checking metrohash v1.0.5 (file:///source)
Aug 02 04:25:17.433 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 04:25:17.434 INFO kablam!  --> benches/bench.rs:1:19
Aug 02 04:25:17.434 INFO kablam!   |
Aug 02 04:25:17.434 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 04:25:17.434 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 04:25:17.434 INFO kablam! 
Aug 02 04:25:17.434 INFO kablam! error: aborting due to previous error
Aug 02 04:25:17.434 INFO kablam! 
Aug 02 04:25:17.434 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 04:25:17.441 INFO kablam! error: Could not compile `metrohash`.
Aug 02 04:25:17.441 INFO kablam! 
Aug 02 04:25:17.441 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 04:25:17.443 INFO kablam! su: No module specific data is present
Aug 02 04:25:18.196 INFO running `"docker" "rm" "-f" "49b719aea360bb8dcff9a0bff79d48752340d4822f43c1d0d78e0e62dcae9bec"`
Aug 02 04:25:18.347 INFO blam! 49b719aea360bb8dcff9a0bff79d48752340d4822f43c1d0d78e0e62dcae9bec