Aug 02 06:14:44.800 INFO checking json_str-0.5.2 against 1.27.2 for lazy_static-1
Aug 02 06:14:44.800 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:14:44.800 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:14:44.800 INFO running `"docker" "create" "-v" "/tmp/crater.Q9tfD2dL3bvQ:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2:/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 06:14:45.053 INFO blam! 3f870aa4d584e998f8844b75d07a4bcac89c4435ac68694011ab9575f270d3e2
Aug 02 06:14:45.054 INFO running `"docker" "start" "-a" "3f870aa4d584e998f8844b75d07a4bcac89c4435ac68694011ab9575f270d3e2"`
Aug 02 06:14:45.890 INFO kablam!    Compiling json_str v0.5.2 (file:///source)
Aug 02 06:14:49.438 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 06:14:49.438 INFO kablam!  --> benches/mod.rs:1:1
Aug 02 06:14:49.438 INFO kablam!   |
Aug 02 06:14:49.438 INFO kablam! 1 | #![feature(test, plugin, custom_derive)]
Aug 02 06:14:49.438 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 02 06:14:49.438 INFO kablam! 
Aug 02 06:14:49.439 INFO kablam! error: aborting due to previous error
Aug 02 06:14:49.439 INFO kablam! 
Aug 02 06:14:49.440 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 06:14:49.447 INFO kablam! error: Could not compile `json_str`.
Aug 02 06:14:49.447 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 06:14:49.645 INFO kablam! error: build failed
Aug 02 06:14:49.652 INFO kablam! su: No module specific data is present
Aug 02 06:14:50.360 INFO running `"docker" "rm" "-f" "3f870aa4d584e998f8844b75d07a4bcac89c4435ac68694011ab9575f270d3e2"`
Aug 02 06:14:50.509 INFO blam! 3f870aa4d584e998f8844b75d07a4bcac89c4435ac68694011ab9575f270d3e2