Aug 02 10:28:34.448 INFO checking expression-num-0.2.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 10:28:34.448 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 10:28:34.448 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 10:28:34.448 INFO running `"docker" "create" "-v" "/tmp/crater.N5al1ZRlel7Z:/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 10:28:34.742 INFO blam! c58cf53d78174e06718055b43695d958d712c13d40a1a24690c9663328b3390b
Aug 02 10:28:34.747 INFO running `"docker" "start" "-a" "c58cf53d78174e06718055b43695d958d712c13d40a1a24690c9663328b3390b"`
Aug 02 10:28:35.574 INFO kablam!     Checking expression v0.3.3
Aug 02 10:28:36.000 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 10:28:36.000 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/expression-0.3.3/src/lib.rs:1:1
Aug 02 10:28:36.000 INFO kablam!   |
Aug 02 10:28:36.000 INFO kablam! 1 | #![feature(box_syntax)]
Aug 02 10:28:36.000 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^
Aug 02 10:28:36.000 INFO kablam! 
Aug 02 10:28:36.001 INFO kablam! error: aborting due to previous error
Aug 02 10:28:36.001 INFO kablam! 
Aug 02 10:28:36.001 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 10:28:36.008 INFO kablam! error: Could not compile `expression`.
Aug 02 10:28:36.008 INFO kablam! 
Aug 02 10:28:36.008 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 10:28:36.010 INFO kablam! su: No module specific data is present
Aug 02 10:28:36.522 INFO running `"docker" "rm" "-f" "c58cf53d78174e06718055b43695d958d712c13d40a1a24690c9663328b3390b"`
Aug 02 10:28:36.674 INFO blam! c58cf53d78174e06718055b43695d958d712c13d40a1a24690c9663328b3390b