Aug 01 23:36:04.460 INFO checking rust-freqdist-0.1.5 against 1.27.2+tmplazy for lazy_static-1
Aug 01 23:36:04.460 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:36:04.460 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:36:04.460 INFO running `"docker" "create" "-v" "/tmp/crater.pSHay0F2jZfM:/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 01 23:36:04.675 INFO blam! 095cf83e1d99c619878e3c18340eee5eea84b0b9ea57782f85bde1e511c022d4
Aug 01 23:36:04.677 INFO running `"docker" "start" "-a" "095cf83e1d99c619878e3c18340eee5eea84b0b9ea57782f85bde1e511c022d4"`
Aug 01 23:36:05.823 INFO kablam!     Checking rust-freqdist v0.1.5 (file:///source)
Aug 01 23:36:06.256 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 23:36:06.256 INFO kablam!   --> src/lib.rs:29:19
Aug 01 23:36:06.256 INFO kablam!    |
Aug 01 23:36:06.256 INFO kablam! 29 | #![cfg_attr(test, feature(test))]
Aug 01 23:36:06.256 INFO kablam!    |                   ^^^^^^^^^^^^^^
Aug 01 23:36:06.256 INFO kablam! 
Aug 01 23:36:06.257 INFO kablam! error: aborting due to previous error
Aug 01 23:36:06.257 INFO kablam! 
Aug 01 23:36:06.257 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 23:36:06.265 INFO kablam! error: Could not compile `rust-freqdist`.
Aug 01 23:36:06.265 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 23:36:06.602 INFO kablam! error: build failed
Aug 01 23:36:06.603 INFO kablam! su: No module specific data is present
Aug 01 23:36:07.319 INFO running `"docker" "rm" "-f" "095cf83e1d99c619878e3c18340eee5eea84b0b9ea57782f85bde1e511c022d4"`
Aug 01 23:36:07.536 INFO blam! 095cf83e1d99c619878e3c18340eee5eea84b0b9ea57782f85bde1e511c022d4