Aug 02 06:14:44.578 INFO checking json_str-0.5.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 06:14:44.578 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:14:44.578 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:14:44.578 INFO running `"docker" "create" "-v" "/tmp/crater.0VrJU3pORpg8:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-1/1.27.2+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 02 06:14:44.805 INFO blam! 86b51a1635c7382c14a17e57c92d07ee2047492473e048100e53046dbb14ec2e
Aug 02 06:14:44.806 INFO running `"docker" "start" "-a" "86b51a1635c7382c14a17e57c92d07ee2047492473e048100e53046dbb14ec2e"`
Aug 02 06:14:45.676 INFO kablam!    Compiling json_str v0.5.2 (file:///source)
Aug 02 06:14:49.459 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 06:14:49.459 INFO kablam!  --> benches/mod.rs:1:1
Aug 02 06:14:49.459 INFO kablam!   |
Aug 02 06:14:49.459 INFO kablam! 1 | #![feature(test, plugin, custom_derive)]
Aug 02 06:14:49.459 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 02 06:14:49.460 INFO kablam! 
Aug 02 06:14:49.460 INFO kablam! error: aborting due to previous error
Aug 02 06:14:49.460 INFO kablam! 
Aug 02 06:14:49.460 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 06:14:49.466 INFO kablam! error: Could not compile `json_str`.
Aug 02 06:14:49.466 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 06:14:49.594 INFO kablam! error: build failed
Aug 02 06:14:49.595 INFO kablam! su: No module specific data is present
Aug 02 06:14:50.318 INFO running `"docker" "rm" "-f" "86b51a1635c7382c14a17e57c92d07ee2047492473e048100e53046dbb14ec2e"`
Aug 02 06:14:50.475 INFO blam! 86b51a1635c7382c14a17e57c92d07ee2047492473e048100e53046dbb14ec2e