Aug 02 05:41:52.195 INFO checking lettre-0.7.0 against 1.27.2+tmplazy for lazy_static-1
Aug 02 05:41:52.195 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:41:52.195 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:41:52.195 INFO running `"docker" "create" "-v" "/tmp/crater.AsdrqBJzJyaN:/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 05:41:52.467 INFO blam! d64a5c6b173d8c9332d633c5d9c749580034634bdb12200b4744420a58c52a64
Aug 02 05:41:52.469 INFO running `"docker" "start" "-a" "d64a5c6b173d8c9332d633c5d9c749580034634bdb12200b4744420a58c52a64"`
Aug 02 05:41:53.705 INFO kablam!     Checking lettre v0.7.0 (file:///source)
Aug 02 05:42:06.562 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 05:42:06.562 INFO kablam!  --> benches/transport_smtp.rs:1:1
Aug 02 05:42:06.562 INFO kablam!   |
Aug 02 05:42:06.562 INFO kablam! 1 | #![feature(test)]
Aug 02 05:42:06.562 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 05:42:06.568 INFO kablam! 
Aug 02 05:42:06.569 INFO kablam! error: aborting due to previous error
Aug 02 05:42:06.569 INFO kablam! 
Aug 02 05:42:06.570 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 05:42:06.617 INFO kablam! error: Could not compile `lettre`.
Aug 02 05:42:06.617 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 05:42:07.998 INFO kablam! error: build failed
Aug 02 05:42:08.001 INFO kablam! su: No module specific data is present
Aug 02 05:42:08.560 INFO running `"docker" "rm" "-f" "d64a5c6b173d8c9332d633c5d9c749580034634bdb12200b4744420a58c52a64"`
Aug 02 05:42:08.732 INFO blam! d64a5c6b173d8c9332d633c5d9c749580034634bdb12200b4744420a58c52a64