Aug 02 04:36:39.590 INFO checking mc-varint-0.1.1 against 1.27.2 for lazy_static-1
Aug 02 04:36:39.590 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:36:39.590 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:36:39.590 INFO running `"docker" "create" "-v" "/tmp/crater.5lZTBu0gM70Y:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2:/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 02 04:36:39.814 INFO blam! b2046f9496c641cb6afc8436771375012e956c37c97969674d51845a6d36e8f0
Aug 02 04:36:39.817 INFO running `"docker" "start" "-a" "b2046f9496c641cb6afc8436771375012e956c37c97969674d51845a6d36e8f0"`
Aug 02 04:36:40.799 INFO kablam!     Checking mc-varint v0.1.1 (file:///source)
Aug 02 04:36:43.102 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 04:36:43.102 INFO kablam!  --> benches/var_int.rs:1:1
Aug 02 04:36:43.102 INFO kablam!   |
Aug 02 04:36:43.102 INFO kablam! 1 | #![feature(test)]
Aug 02 04:36:43.102 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 04:36:43.102 INFO kablam! 
Aug 02 04:36:43.103 INFO kablam! error: aborting due to previous error
Aug 02 04:36:43.103 INFO kablam! 
Aug 02 04:36:43.103 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 04:36:43.110 INFO kablam! error: Could not compile `mc-varint`.
Aug 02 04:36:43.110 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 04:36:43.343 INFO kablam! error: build failed
Aug 02 04:36:43.344 INFO kablam! su: No module specific data is present
Aug 02 04:36:43.931 INFO running `"docker" "rm" "-f" "b2046f9496c641cb6afc8436771375012e956c37c97969674d51845a6d36e8f0"`
Aug 02 04:36:44.115 INFO blam! b2046f9496c641cb6afc8436771375012e956c37c97969674d51845a6d36e8f0