Aug 01 21:46:31.025 INFO checking sorting_networks-0.1.0 against 1.27.2 for lazy_static-1
Aug 01 21:46:31.025 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:46:31.025 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:46:31.025 INFO running `"docker" "create" "-v" "/tmp/crater.iO4VghMAsJXS:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2:/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 01 21:46:31.198 INFO blam! 75a07b7a63d735cac08ca33432cbacea29925a1f73b6476d220448bce38863c2
Aug 01 21:46:31.200 INFO running `"docker" "start" "-a" "75a07b7a63d735cac08ca33432cbacea29925a1f73b6476d220448bce38863c2"`
Aug 01 21:46:32.310 INFO kablam!    Compiling sorting_networks v0.1.0 (file:///source)
Aug 01 21:46:35.991 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:46:35.991 INFO kablam!  --> src/lib.rs:2:24
Aug 01 21:46:35.991 INFO kablam!   |
Aug 01 21:46:35.991 INFO kablam! 2 | #![cfg_attr(not(test), feature(lang_items))]
Aug 01 21:46:35.991 INFO kablam!   |                        ^^^^^^^^^^^^^^^^^^^^
Aug 01 21:46:35.991 INFO kablam! 
Aug 01 21:46:35.992 INFO kablam! error: aborting due to previous error
Aug 01 21:46:35.992 INFO kablam! 
Aug 01 21:46:35.992 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:46:36.001 INFO kablam! error: Could not compile `sorting_networks`.
Aug 01 21:46:36.001 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 21:46:36.668 INFO kablam! error: build failed
Aug 01 21:46:36.670 INFO kablam! su: No module specific data is present
Aug 01 21:46:37.201 INFO running `"docker" "rm" "-f" "75a07b7a63d735cac08ca33432cbacea29925a1f73b6476d220448bce38863c2"`
Aug 01 21:46:37.331 INFO blam! 75a07b7a63d735cac08ca33432cbacea29925a1f73b6476d220448bce38863c2