Sep 10 10:44:20.767 INFO checking rust-sort-0.1.4 against try#3a2610c2a16575649896925631bf8cec4f4b1961 for pr-54090
Sep 10 10:44:20.768 INFO running: cargo +3a2610c2a16575649896925631bf8cec4f4b1961-alt check --frozen --all --all-targets
Sep 10 10:44:20.768 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-54090/try#3a2610c2a16575649896925631bf8cec4f4b1961:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-4/try#3a2610c2a16575649896925631bf8cec4f4b1961:/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 +3a2610c2a16575649896925631bf8cec4f4b1961-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-m" "2G" "crater"`
Sep 10 10:44:20.989 INFO blam! b3e1d995f5169fd1d6ef05a7087e63396a088f456b14fc6ec15b2986ad747903
Sep 10 10:44:20.992 INFO running `"docker" "start" "-a" "b3e1d995f5169fd1d6ef05a7087e63396a088f456b14fc6ec15b2986ad747903"`
Sep 10 10:44:22.158 INFO kablam! usermod: no changes
Sep 10 10:44:22.202 INFO kablam!     Checking commandext v0.1.0
Sep 10 10:44:22.202 INFO kablam!     Checking rust-sort v0.1.4 (file:///source)
Sep 10 10:44:22.613 INFO kablam!     Checking utils v0.0.1
Sep 10 10:44:22.783 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 10 10:44:22.783 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:83:3
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam! 83 | #[experimental]
Sep 10 10:44:22.783 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.783 INFO kablam! 
Sep 10 10:44:22.783 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 10 10:44:22.783 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:77:3
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam! 77 | #[experimental]
Sep 10 10:44:22.783 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.783 INFO kablam! 
Sep 10 10:44:22.783 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 10 10:44:22.783 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:37:3
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam! 37 | #[experimental]
Sep 10 10:44:22.783 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.783 INFO kablam!    |
Sep 10 10:44:22.783 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.783 INFO kablam! 
Sep 10 10:44:22.784 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 10 10:44:22.784 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:29:3
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam! 29 | #[experimental]
Sep 10 10:44:22.784 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.784 INFO kablam! 
Sep 10 10:44:22.784 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 10 10:44:22.784 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/lib.rs:13:3
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam! 13 | #[experimental]
Sep 10 10:44:22.784 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.784 INFO kablam! 
Sep 10 10:44:22.784 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 10 10:44:22.784 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:63:3
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam! 63 | #[experimental]
Sep 10 10:44:22.784 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.784 INFO kablam! 
Sep 10 10:44:22.784 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 10 10:44:22.784 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:45:3
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam! 45 | #[experimental]
Sep 10 10:44:22.784 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.784 INFO kablam!    |
Sep 10 10:44:22.784 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 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 10 10:44:22.785 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:37:3
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam! 37 | #[experimental]
Sep 10 10:44:22.785 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 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 10 10:44:22.785 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:29:3
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam! 29 | #[experimental]
Sep 10 10:44:22.785 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 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 10 10:44:22.785 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:21:3
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam! 21 | #[experimental]
Sep 10 10:44:22.785 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 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 10 10:44:22.785 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/utils-0.0.1/src/empty.rs:14:3
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam! 14 | #[experimental]
Sep 10 10:44:22.785 INFO kablam!    |   ^^^^^^^^^^^^
Sep 10 10:44:22.785 INFO kablam!    |
Sep 10 10:44:22.785 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 INFO kablam! error: aborting due to 11 previous errors
Sep 10 10:44:22.785 INFO kablam! 
Sep 10 10:44:22.785 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 10 10:44:22.789 INFO kablam! error: Could not compile `utils`.
Sep 10 10:44:22.789 INFO kablam! 
Sep 10 10:44:22.789 INFO kablam! To learn more, run the command again with --verbose.
Sep 10 10:44:22.790 INFO kablam! su: No module specific data is present
Sep 10 10:44:23.589 INFO running `"docker" "rm" "-f" "b3e1d995f5169fd1d6ef05a7087e63396a088f456b14fc6ec15b2986ad747903"`
Sep 10 10:44:23.695 INFO blam! b3e1d995f5169fd1d6ef05a7087e63396a088f456b14fc6ec15b2986ad747903