Aug 02 05:31:44.437 INFO checking libgo-0.4.0 against 1.27.2 for lazy_static-1
Aug 02 05:31:44.437 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:31:44.437 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:31:44.437 INFO running `"docker" "create" "-v" "/tmp/crater.myuoxgCjJ01N:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2:/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 05:31:44.683 INFO blam! e2706b9a28aeb336db4ef9847286ea9a55307c7be06cd89617cb8cb5ee9519a1
Aug 02 05:31:44.685 INFO running `"docker" "start" "-a" "e2706b9a28aeb336db4ef9847286ea9a55307c7be06cd89617cb8cb5ee9519a1"`
Aug 02 05:31:46.496 INFO kablam!     Checking libgo v0.4.0 (file:///source)
Aug 02 05:31:49.443 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 05:31:49.443 INFO kablam!  --> benches/benchmarks.rs:1:1
Aug 02 05:31:49.443 INFO kablam!   |
Aug 02 05:31:49.443 INFO kablam! 1 | #![feature(test)]
Aug 02 05:31:49.443 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 05:31:49.443 INFO kablam! 
Aug 02 05:31:49.443 INFO kablam! error: aborting due to previous error
Aug 02 05:31:49.443 INFO kablam! 
Aug 02 05:31:49.444 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 05:31:49.454 INFO kablam! error: Could not compile `libgo`.
Aug 02 05:31:49.454 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 05:31:49.710 INFO kablam! error: build failed
Aug 02 05:31:49.712 INFO kablam! su: No module specific data is present
Aug 02 05:31:50.657 INFO running `"docker" "rm" "-f" "e2706b9a28aeb336db4ef9847286ea9a55307c7be06cd89617cb8cb5ee9519a1"`
Aug 02 05:31:50.825 INFO blam! e2706b9a28aeb336db4ef9847286ea9a55307c7be06cd89617cb8cb5ee9519a1