Aug 02 02:39:47.948 INFO checking parser-combinators-0.2.6 against 1.27.2 for lazy_static-1
Aug 02 02:39:47.949 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 02:39:47.949 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 02:39:47.949 INFO running `"docker" "create" "-v" "/tmp/crater.tbTgLqZ52kI4:/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 02:39:48.217 INFO blam! cf99cdf892d12745bdba4183096f123185d39bc5e90a9ed373cb884ad13290c4
Aug 02 02:39:48.217 INFO running `"docker" "start" "-a" "cf99cdf892d12745bdba4183096f123185d39bc5e90a9ed373cb884ad13290c4"`
Aug 02 02:39:49.203 INFO kablam!     Checking parser-combinators v0.2.6 (file:///source)
Aug 02 02:39:50.083 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 02:39:50.083 INFO kablam!  --> src/lib.rs:1:19
Aug 02 02:39:50.083 INFO kablam!   |
Aug 02 02:39:50.083 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 02:39:50.083 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 02:39:50.083 INFO kablam! 
Aug 02 02:39:50.097 INFO kablam! error: aborting due to previous error
Aug 02 02:39:50.097 INFO kablam! 
Aug 02 02:39:50.097 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 02:39:50.116 INFO kablam! error: Could not compile `parser-combinators`.
Aug 02 02:39:50.116 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 02:39:51.379 INFO kablam! error: build failed
Aug 02 02:39:51.381 INFO kablam! su: No module specific data is present
Aug 02 02:39:51.900 INFO running `"docker" "rm" "-f" "cf99cdf892d12745bdba4183096f123185d39bc5e90a9ed373cb884ad13290c4"`
Aug 02 02:39:52.094 INFO blam! cf99cdf892d12745bdba4183096f123185d39bc5e90a9ed373cb884ad13290c4