Sep 21 03:58:50.355 INFO checking rust-sort-0.1.4 against try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6 for pr-54394
Sep 21 03:58:50.355 INFO running: cargo +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets
Sep 21 03:58:50.355 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-54394/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54394/worker-4/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/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" "-e" "USER_ID=1000" "-e" "CMD=cargo +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 21 03:58:50.567 INFO blam! 6983fa980191f99db0e9667c62e5bd731e27d78041eb8cdfeddad077a6e55a35
Sep 21 03:58:50.570 INFO running `"docker" "start" "-a" "6983fa980191f99db0e9667c62e5bd731e27d78041eb8cdfeddad077a6e55a35"`
Sep 21 03:58:52.003 INFO kablam! usermod: no changes
Sep 21 03:58:52.071 INFO kablam!     Checking rust-sort v0.1.4 (/source)
Sep 21 03:58:52.071 INFO kablam!     Checking utils v0.0.1
Sep 21 03:58:52.300 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.300 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:83:3
Sep 21 03:58:52.300 INFO kablam!    |
Sep 21 03:58:52.300 INFO kablam! 83 | #[experimental]
Sep 21 03:58:52.300 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.300 INFO kablam!    |
Sep 21 03:58:52.300 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.301 INFO kablam! 
Sep 21 03:58:52.301 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.301 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:77:3
Sep 21 03:58:52.301 INFO kablam!    |
Sep 21 03:58:52.301 INFO kablam! 77 | #[experimental]
Sep 21 03:58:52.301 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.301 INFO kablam!    |
Sep 21 03:58:52.301 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.301 INFO kablam! 
Sep 21 03:58:52.302 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.302 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:37:3
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam! 37 | #[experimental]
Sep 21 03:58:52.302 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.302 INFO kablam! 
Sep 21 03:58:52.302 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.302 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:29:3
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam! 29 | #[experimental]
Sep 21 03:58:52.302 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.302 INFO kablam! 
Sep 21 03:58:52.302 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.302 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:13:3
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam! 13 | #[experimental]
Sep 21 03:58:52.302 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.302 INFO kablam!    |
Sep 21 03:58:52.302 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.302 INFO kablam! 
Sep 21 03:58:52.303 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.303 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:63:3
Sep 21 03:58:52.303 INFO kablam!    |
Sep 21 03:58:52.303 INFO kablam! 63 | #[experimental]
Sep 21 03:58:52.303 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.303 INFO kablam!    |
Sep 21 03:58:52.303 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.303 INFO kablam! 
Sep 21 03:58:52.303 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.303 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:45:3
Sep 21 03:58:52.303 INFO kablam!    |
Sep 21 03:58:52.303 INFO kablam! 45 | #[experimental]
Sep 21 03:58:52.303 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.303 INFO kablam!    |
Sep 21 03:58:52.303 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.303 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.306 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:37:3
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam! 37 | #[experimental]
Sep 21 03:58:52.306 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.306 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.306 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:29:3
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam! 29 | #[experimental]
Sep 21 03:58:52.306 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.306 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.306 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:21:3
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam! 21 | #[experimental]
Sep 21 03:58:52.306 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.306 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! error[E0658]: The attribute `experimental` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 21 03:58:52.306 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:14:3
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam! 14 | #[experimental]
Sep 21 03:58:52.306 INFO kablam!    |   ^^^^^^^^^^^^
Sep 21 03:58:52.306 INFO kablam!    |
Sep 21 03:58:52.306 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 21 03:58:52.306 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! error: aborting due to 11 previous errors
Sep 21 03:58:52.306 INFO kablam! 
Sep 21 03:58:52.306 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 21 03:58:52.309 INFO kablam! error: Could not compile `utils`.
Sep 21 03:58:52.309 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 21 03:58:52.386 INFO kablam! error: build failed
Sep 21 03:58:52.387 INFO kablam! su: No module specific data is present
Sep 21 03:58:53.180 INFO running `"docker" "rm" "-f" "6983fa980191f99db0e9667c62e5bd731e27d78041eb8cdfeddad077a6e55a35"`
Sep 21 03:58:53.263 INFO blam! 6983fa980191f99db0e9667c62e5bd731e27d78041eb8cdfeddad077a6e55a35