Aug 02 04:28:02.379 INFO checking merkle-tree-stream-0.5.0 against 1.27.2 for lazy_static-1
Aug 02 04:28:02.379 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:28:02.379 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:28:02.379 INFO running `"docker" "create" "-v" "/tmp/crater.6eMTuXtecmQo:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2:/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 04:28:02.642 INFO blam! abcd44409bdce683dea96d2ab1aa42c01d2548a8e97effe11e63a05d0af55a35
Aug 02 04:28:02.644 INFO running `"docker" "start" "-a" "abcd44409bdce683dea96d2ab1aa42c01d2548a8e97effe11e63a05d0af55a35"`
Aug 02 04:28:03.824 INFO kablam!     Checking flat-tree v3.3.0
Aug 02 04:28:04.398 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 04:28:04.399 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/flat-tree-3.3.0/src/lib.rs:2:1
Aug 02 04:28:04.399 INFO kablam!   |
Aug 02 04:28:04.399 INFO kablam! 2 | #![feature(external_doc)]
Aug 02 04:28:04.399 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 02 04:28:04.399 INFO kablam! 
Aug 02 04:28:04.400 INFO kablam! error: aborting due to previous error
Aug 02 04:28:04.400 INFO kablam! 
Aug 02 04:28:04.400 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 04:28:04.411 INFO kablam! error: Could not compile `flat-tree`.
Aug 02 04:28:04.411 INFO kablam! 
Aug 02 04:28:04.411 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 04:28:04.413 INFO kablam! su: No module specific data is present
Aug 02 04:28:05.439 INFO running `"docker" "rm" "-f" "abcd44409bdce683dea96d2ab1aa42c01d2548a8e97effe11e63a05d0af55a35"`
Aug 02 04:28:05.602 INFO blam! abcd44409bdce683dea96d2ab1aa42c01d2548a8e97effe11e63a05d0af55a35