Aug 02 10:52:29.816 INFO checking emit-0.10.0 against 1.27.2 for lazy_static-1
Aug 02 10:52:29.816 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 10:52:29.816 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 10:52:29.816 INFO running `"docker" "create" "-v" "/tmp/crater.vgMg8LMr5FLz:/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 10:52:30.074 INFO blam! a433e8c28866ec0ea718e226e030a9d71d7f0118617880a905ab18af194a2adb
Aug 02 10:52:30.077 INFO running `"docker" "start" "-a" "a433e8c28866ec0ea718e226e030a9d71d7f0118617880a905ab18af194a2adb"`
Aug 02 10:52:31.149 INFO kablam!     Checking serde_json v0.7.4
Aug 02 10:52:33.841 INFO kablam!     Checking emit v0.10.0 (file:///source)
Aug 02 10:52:36.513 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 10:52:36.513 INFO kablam!  --> benches/mod.rs:1:1
Aug 02 10:52:36.513 INFO kablam!   |
Aug 02 10:52:36.513 INFO kablam! 1 | #![feature(test)]
Aug 02 10:52:36.513 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 10:52:36.513 INFO kablam! 
Aug 02 10:52:36.514 INFO kablam! error: aborting due to previous error
Aug 02 10:52:36.514 INFO kablam! 
Aug 02 10:52:36.514 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 10:52:36.525 INFO kablam! error: Could not compile `emit`.
Aug 02 10:52:36.525 INFO kablam! 
Aug 02 10:52:36.525 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 10:52:36.527 INFO kablam! su: No module specific data is present
Aug 02 10:52:37.047 INFO running `"docker" "rm" "-f" "a433e8c28866ec0ea718e226e030a9d71d7f0118617880a905ab18af194a2adb"`
Aug 02 10:52:37.228 INFO blam! a433e8c28866ec0ea718e226e030a9d71d7f0118617880a905ab18af194a2adb