Aug 30 00:28:07.580 INFO checking trie-0.2.0 against master#ede55518431154bc761f7b2438cce9078c162700 for pr-53707
Aug 30 00:28:07.581 INFO running: cargo +ede55518431154bc761f7b2438cce9078c162700-alt check --frozen --all --all-targets
Aug 30 00:28:07.581 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53707/master#ede55518431154bc761f7b2438cce9078c162700:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53707/worker-2/master#ede55518431154bc761f7b2438cce9078c162700:/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" "-e" "USER_ID=500" "-e" "CMD=cargo +ede55518431154bc761f7b2438cce9078c162700-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Aug 30 00:28:07.714 INFO blam! 3a91526af2e518bdf872d9afe10980b3fb27d053357e4aa47bee366394f273f1
Aug 30 00:28:07.716 INFO running `"docker" "start" "-a" "3a91526af2e518bdf872d9afe10980b3fb27d053357e4aa47bee366394f273f1"`
Aug 30 00:28:08.487 INFO kablam!     Checking trie v0.2.0 (file:///source)
Aug 30 00:28:10.538 INFO kablam! error[E0635]: unknown feature `step_by`
Aug 30 00:28:10.538 INFO kablam!   --> src/lib.rs:13:38
Aug 30 00:28:10.538 INFO kablam!    |
Aug 30 00:28:10.539 INFO kablam! 13 | #![cfg_attr(test, feature(fn_traits, step_by, test, unboxed_closures))]
Aug 30 00:28:10.539 INFO kablam!    |                                      ^^^^^^^
Aug 30 00:28:10.539 INFO kablam! 
Aug 30 00:28:10.582 INFO kablam! error: aborting due to previous error
Aug 30 00:28:10.582 INFO kablam! 
Aug 30 00:28:10.582 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 30 00:28:10.591 INFO kablam! error: Could not compile `trie`.
Aug 30 00:28:10.591 INFO kablam! 
Aug 30 00:28:10.591 INFO kablam! To learn more, run the command again with --verbose.
Aug 30 00:28:10.592 INFO kablam! su: No module specific data is present
Aug 30 00:28:10.970 INFO running `"docker" "rm" "-f" "3a91526af2e518bdf872d9afe10980b3fb27d053357e4aa47bee366394f273f1"`
Aug 30 00:28:11.057 INFO blam! 3a91526af2e518bdf872d9afe10980b3fb27d053357e4aa47bee366394f273f1