Aug 01 21:56:16.227 INFO checking smallvec-0.5.1 against 1.27.2 for lazy_static-1
Aug 01 21:56:16.227 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:56:16.227 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:56:16.227 INFO running `"docker" "create" "-v" "/tmp/crater.qRijMADFZ6v2:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-4/1.27.2:/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 21:56:16.467 INFO blam! 72fae0b3bda710336e42383f90138018e36b12ab944b4d60d5e8521be8b0e87d
Aug 01 21:56:16.469 INFO running `"docker" "start" "-a" "72fae0b3bda710336e42383f90138018e36b12ab944b4d60d5e8521be8b0e87d"`
Aug 01 21:56:17.597 INFO kablam!     Checking smallvec v0.5.1 (file:///source)
Aug 01 21:56:20.436 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:56:20.436 INFO kablam!  --> benches/bench.rs:1:1
Aug 01 21:56:20.437 INFO kablam!   |
Aug 01 21:56:20.437 INFO kablam! 1 | #![feature(test)]
Aug 01 21:56:20.437 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 01 21:56:20.437 INFO kablam! 
Aug 01 21:56:20.442 INFO kablam! error: aborting due to previous error
Aug 01 21:56:20.442 INFO kablam! 
Aug 01 21:56:20.442 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:56:20.454 INFO kablam! error: Could not compile `smallvec`.
Aug 01 21:56:20.455 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 21:56:21.958 INFO kablam! error: build failed
Aug 01 21:56:21.960 INFO kablam! su: No module specific data is present
Aug 01 21:56:22.575 INFO running `"docker" "rm" "-f" "72fae0b3bda710336e42383f90138018e36b12ab944b4d60d5e8521be8b0e87d"`
Aug 01 21:56:22.740 INFO blam! 72fae0b3bda710336e42383f90138018e36b12ab944b4d60d5e8521be8b0e87d