Aug 01 20:04:46.833 INFO checking tree-index-0.4.0 against 1.27.2 for lazy_static-1
Aug 01 20:04:46.833 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 20:04:46.833 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 20:04:46.833 INFO running `"docker" "create" "-v" "/tmp/crater.aPILKDe6Qaxe:/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 20:04:47.015 INFO blam! f7ffa9caa66da837fdc86b9bbb235efbdb6eb1624a5bf983018ec7f6bea41d8f
Aug 01 20:04:47.017 INFO running `"docker" "start" "-a" "f7ffa9caa66da837fdc86b9bbb235efbdb6eb1624a5bf983018ec7f6bea41d8f"`
Aug 01 20:04:47.877 INFO kablam!     Checking memory-pager v0.6.1
Aug 01 20:04:47.877 INFO kablam!     Checking flat-tree v3.3.0
Aug 01 20:04:48.295 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 20:04:48.295 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/flat-tree-3.3.0/src/lib.rs:2:1
Aug 01 20:04:48.295 INFO kablam!   |
Aug 01 20:04:48.295 INFO kablam! 2 | #![feature(external_doc)]
Aug 01 20:04:48.295 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 01 20:04:48.298 INFO kablam! 
Aug 01 20:04:48.300 INFO kablam! error: aborting due to previous error
Aug 01 20:04:48.300 INFO kablam! 
Aug 01 20:04:48.301 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 20:04:48.309 INFO kablam! error: Could not compile `flat-tree`.
Aug 01 20:04:48.310 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 20:04:48.461 INFO kablam! error: build failed
Aug 01 20:04:48.463 INFO kablam! su: No module specific data is present
Aug 01 20:04:49.161 INFO running `"docker" "rm" "-f" "f7ffa9caa66da837fdc86b9bbb235efbdb6eb1624a5bf983018ec7f6bea41d8f"`
Aug 01 20:04:49.314 INFO blam! f7ffa9caa66da837fdc86b9bbb235efbdb6eb1624a5bf983018ec7f6bea41d8f