Aug 01 20:04:46.710 INFO checking tree-index-0.4.0 against 1.27.2+tmplazy for lazy_static-1
Aug 01 20:04:46.710 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 20:04:46.710 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 20:04:46.710 INFO running `"docker" "create" "-v" "/tmp/crater.xK9ARPtS1GmE:/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 20:04:46.906 INFO blam! 2147b9be120a03bcfe195ff9003e48897bac58c54967cfa1fc4941ec038c28aa
Aug 01 20:04:46.908 INFO running `"docker" "start" "-a" "2147b9be120a03bcfe195ff9003e48897bac58c54967cfa1fc4941ec038c28aa"`
Aug 01 20:04:47.800 INFO kablam!     Checking memory-pager v0.6.1
Aug 01 20:04:47.802 INFO kablam!     Checking flat-tree v3.3.0
Aug 01 20:04:48.327 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 20:04:48.327 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/flat-tree-3.3.0/src/lib.rs:2:1
Aug 01 20:04:48.327 INFO kablam!   |
Aug 01 20:04:48.327 INFO kablam! 2 | #![feature(external_doc)]
Aug 01 20:04:48.327 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 01 20:04:48.327 INFO kablam! 
Aug 01 20:04:48.327 INFO kablam! error: aborting due to previous error
Aug 01 20:04:48.327 INFO kablam! 
Aug 01 20:04:48.327 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 20:04:48.334 INFO kablam! error: Could not compile `flat-tree`.
Aug 01 20:04:48.334 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 20:04:48.469 INFO kablam! error: build failed
Aug 01 20:04:48.471 INFO kablam! su: No module specific data is present
Aug 01 20:04:49.275 INFO running `"docker" "rm" "-f" "2147b9be120a03bcfe195ff9003e48897bac58c54967cfa1fc4941ec038c28aa"`
Aug 01 20:04:49.423 INFO blam! 2147b9be120a03bcfe195ff9003e48897bac58c54967cfa1fc4941ec038c28aa