Aug 02 00:26:20.491 INFO checking rmp-serde-0.13.7 against 1.27.2 for lazy_static-1
Aug 02 00:26:20.491 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:26:20.491 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:26:20.491 INFO running `"docker" "create" "-v" "/tmp/crater.p9NMohZD3ydn:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2:/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 00:26:20.718 INFO blam! 8041159db5044d308a9a0ac4ca9eee3d431b8e3514d4aaa3143edf5ddf728d87
Aug 02 00:26:20.727 INFO running `"docker" "start" "-a" "8041159db5044d308a9a0ac4ca9eee3d431b8e3514d4aaa3143edf5ddf728d87"`
Aug 02 00:26:21.878 INFO kablam!     Checking rmp-serde v0.13.7 (file:///source)
Aug 02 00:26:26.163 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 00:26:26.163 INFO kablam!  --> benches/buf.rs:1:1
Aug 02 00:26:26.163 INFO kablam!   |
Aug 02 00:26:26.163 INFO kablam! 1 | #![feature(test)]
Aug 02 00:26:26.163 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 00:26:26.168 INFO kablam! 
Aug 02 00:26:26.169 INFO kablam! error: aborting due to previous error
Aug 02 00:26:26.169 INFO kablam! 
Aug 02 00:26:26.169 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 00:26:26.239 INFO kablam! error: Could not compile `rmp-serde`.
Aug 02 00:26:26.239 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 00:26:30.325 INFO kablam! error: build failed
Aug 02 00:26:30.331 INFO kablam! su: No module specific data is present
Aug 02 00:26:30.938 INFO running `"docker" "rm" "-f" "8041159db5044d308a9a0ac4ca9eee3d431b8e3514d4aaa3143edf5ddf728d87"`
Aug 02 00:26:31.082 INFO blam! 8041159db5044d308a9a0ac4ca9eee3d431b8e3514d4aaa3143edf5ddf728d87