Aug 02 05:41:33.695 INFO checking lettre-0.8.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 05:41:33.695 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:41:33.695 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:41:33.695 INFO running `"docker" "create" "-v" "/tmp/crater.aET53SD2dTIh:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2+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 05:41:33.936 INFO blam! 7f748092326dae36fa41e8ced9291a796dda7982b637ac71b343681ca3d14bc6
Aug 02 05:41:33.937 INFO running `"docker" "start" "-a" "7f748092326dae36fa41e8ced9291a796dda7982b637ac71b343681ca3d14bc6"`
Aug 02 05:41:35.121 INFO kablam!     Checking lettre v0.8.2 (file:///source)
Aug 02 05:41:52.764 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 05:41:52.764 INFO kablam!  --> benches/transport_smtp.rs:1:1
Aug 02 05:41:52.764 INFO kablam!   |
Aug 02 05:41:52.764 INFO kablam! 1 | #![feature(test)]
Aug 02 05:41:52.764 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 05:41:52.764 INFO kablam! 
Aug 02 05:41:52.764 INFO kablam! error: aborting due to previous error
Aug 02 05:41:52.764 INFO kablam! 
Aug 02 05:41:52.764 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 05:41:52.847 INFO kablam! error: Could not compile `lettre`.
Aug 02 05:41:52.847 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 05:41:55.153 INFO kablam! error: build failed
Aug 02 05:41:55.155 INFO kablam! su: No module specific data is present
Aug 02 05:41:55.731 INFO running `"docker" "rm" "-f" "7f748092326dae36fa41e8ced9291a796dda7982b637ac71b343681ca3d14bc6"`
Aug 02 05:41:55.879 INFO blam! 7f748092326dae36fa41e8ced9291a796dda7982b637ac71b343681ca3d14bc6