Aug 02 00:28:52.508 INFO checking rlibcex-0.1.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 00:28:52.508 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:28:52.508 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:28:52.508 INFO running `"docker" "create" "-v" "/tmp/crater.d10sv0v7uCno:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-1/1.27.2+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 00:28:52.735 INFO blam! 2f1ebebd3c9763d8c55662deea7a52e82ff41e07abe622aeccce01546da67981
Aug 02 00:28:52.737 INFO running `"docker" "start" "-a" "2f1ebebd3c9763d8c55662deea7a52e82ff41e07abe622aeccce01546da67981"`
Aug 02 00:28:54.009 INFO kablam!     Checking rlibcex v0.1.2 (file:///source)
Aug 02 00:28:54.413 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 00:28:54.413 INFO kablam!  --> src/lib.rs:3:19
Aug 02 00:28:54.413 INFO kablam!   |
Aug 02 00:28:54.413 INFO kablam! 3 | #![cfg_attr(test, feature(test))]
Aug 02 00:28:54.413 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 00:28:54.413 INFO kablam! 
Aug 02 00:28:54.419 INFO kablam! error: aborting due to previous error
Aug 02 00:28:54.419 INFO kablam! 
Aug 02 00:28:54.420 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 00:28:54.422 INFO kablam! error: Could not compile `rlibcex`.
Aug 02 00:28:54.422 INFO kablam! 
Aug 02 00:28:54.422 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 00:28:54.425 INFO kablam! su: No module specific data is present
Aug 02 00:28:55.216 INFO running `"docker" "rm" "-f" "2f1ebebd3c9763d8c55662deea7a52e82ff41e07abe622aeccce01546da67981"`
Aug 02 00:28:55.329 INFO blam! 2f1ebebd3c9763d8c55662deea7a52e82ff41e07abe622aeccce01546da67981