Aug 01 23:11:51.036 INFO checking rwcell-0.1.2 against 1.27.2 for lazy_static-1
Aug 01 23:11:51.036 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:11:51.036 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:11:51.036 INFO running `"docker" "create" "-v" "/tmp/crater.LE0AiHdbMGgN:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 23:11:51.271 INFO blam! 4051ecf5309c0b359720878d9149617fd98aa5a8a2205630b9d3ba7021567fbf
Aug 01 23:11:51.274 INFO running `"docker" "start" "-a" "4051ecf5309c0b359720878d9149617fd98aa5a8a2205630b9d3ba7021567fbf"`
Aug 01 23:11:52.218 INFO kablam!     Checking rwcell v0.1.2 (file:///source)
Aug 01 23:11:52.851 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 23:11:52.851 INFO kablam!  --> src/lib.rs:2:1
Aug 01 23:11:52.851 INFO kablam!   |
Aug 01 23:11:52.851 INFO kablam! 2 | #![feature(time2)]
Aug 01 23:11:52.851 INFO kablam!   | ^^^^^^^^^^^^^^^^^^
Aug 01 23:11:52.851 INFO kablam! 
Aug 01 23:11:52.852 INFO kablam! error: aborting due to previous error
Aug 01 23:11:52.853 INFO kablam! 
Aug 01 23:11:52.853 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 23:11:52.860 INFO kablam! error: Could not compile `rwcell`.
Aug 01 23:11:52.860 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 23:11:52.878 INFO kablam! error: build failed
Aug 01 23:11:52.880 INFO kablam! su: No module specific data is present
Aug 01 23:11:53.466 INFO running `"docker" "rm" "-f" "4051ecf5309c0b359720878d9149617fd98aa5a8a2205630b9d3ba7021567fbf"`
Aug 01 23:11:53.629 INFO blam! 4051ecf5309c0b359720878d9149617fd98aa5a8a2205630b9d3ba7021567fbf