Sep 01 07:36:22.799 INFO checking safe_core-0.31.0 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53831
Sep 01 07:36:22.799 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 01 07:36:22.799 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53831/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53831/worker-2/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/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=500" "-e" "CMD=cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 01 07:36:23.059 INFO blam! 78d9477545089a5b28f152245d6adf1f709d7c7eba057e99bae2a9d29185e9f2
Sep 01 07:36:23.061 INFO running `"docker" "start" "-a" "78d9477545089a5b28f152245d6adf1f709d7c7eba057e99bae2a9d29185e9f2"`
Sep 01 07:36:24.539 INFO kablam!     Checking c_linked_list v1.1.1
Sep 01 07:36:24.539 INFO kablam!     Checking tiny-keccak v1.3.1
Sep 01 07:36:24.549 INFO kablam!     Checking lru_time_cache v0.7.0
Sep 01 07:36:24.549 INFO kablam!     Checking fake_clock v0.2.0
Sep 01 07:36:24.549 INFO kablam!    Compiling miniz_oxide v0.1.3
Sep 01 07:36:24.561 INFO kablam!     Checking fs2 v0.4.3
Sep 01 07:36:24.561 INFO kablam!     Checking atty v0.2.2
Sep 01 07:36:24.561 INFO kablam!     Checking termion v1.4.0
Sep 01 07:36:26.616 INFO kablam!    Compiling brotli-sys v0.3.0
Sep 01 07:36:26.772 INFO kablam!    Compiling walkdir v2.0.1
Sep 01 07:36:26.901 INFO kablam!     Checking base64 v0.9.2
Sep 01 07:36:26.998 INFO kablam!     Checking combine v2.5.2
Sep 01 07:36:27.219 INFO kablam!    Compiling msdos_time v0.1.6
Sep 01 07:36:29.753 INFO kablam!     Checking bytes v0.4.9
Sep 01 07:36:30.438 INFO kablam!     Checking textwrap v0.6.0
Sep 01 07:36:31.452 INFO kablam!     Checking crossbeam-epoch v0.5.2
Sep 01 07:36:31.566 INFO kablam!     Checking get_if_addrs v0.4.1
Sep 01 07:36:34.357 INFO kablam!    Compiling bzip2-sys v0.1.6
Sep 01 07:36:34.374 INFO kablam!     Checking url v1.5.1
Sep 01 07:36:34.453 INFO kablam!     Checking regex v0.2.11
Sep 01 07:36:36.376 INFO kablam!     Checking clap v2.25.1
Sep 01 07:36:37.238 INFO kablam!    Compiling flate2 v0.2.20
Sep 01 07:36:41.227 INFO kablam!     Checking bincode v0.8.0
Sep 01 07:36:41.338 INFO kablam!    Compiling jni v0.10.1
Sep 01 07:36:44.797 INFO kablam!    Compiling bzip2 v0.3.3
Sep 01 07:36:46.576 INFO kablam!     Checking config_file_handler v0.9.0
Sep 01 07:36:47.449 INFO kablam!     Checking crossbeam-deque v0.6.1
Sep 01 07:36:49.617 INFO kablam!     Checking tokio-io v0.1.8
Sep 01 07:36:49.700 INFO kablam!    Compiling miniz_oxide_c_api v0.1.3
Sep 01 07:36:50.549 INFO kablam!     Checking ws v0.7.3
Sep 01 07:36:52.341 INFO kablam!     Checking hyper v0.10.13
Sep 01 07:36:53.515 INFO kablam!     Checking tokio-threadpool v0.1.6
Sep 01 07:36:56.935 INFO kablam!     Checking log4rs v0.7.0
Sep 01 07:36:58.754 INFO kablam!    Compiling flate2 v1.0.2
Sep 01 07:37:01.691 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.691 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/file.rs:25:3
Sep 01 07:37:01.691 INFO kablam!    |
Sep 01 07:37:01.691 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.691 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.691 INFO kablam!    |
Sep 01 07:37:01.691 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.691 INFO kablam! 
Sep 01 07:37:01.691 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.691 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/console.rs:24:3
Sep 01 07:37:01.691 INFO kablam!    |
Sep 01 07:37:01.691 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.692 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.692 INFO kablam! 
Sep 01 07:37:01.692 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.692 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/roll/delete.rs:16:3
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.692 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.692 INFO kablam! 
Sep 01 07:37:01.692 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.692 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/roll/fixed_window.rs:17:3
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.692 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.692 INFO kablam! 
Sep 01 07:37:01.692 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.692 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/trigger/size.rs:21:3
Sep 01 07:37:01.692 INFO kablam!    |
Sep 01 07:37:01.692 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.692 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.700 INFO kablam!    |
Sep 01 07:37:01.700 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.701 INFO kablam! 
Sep 01 07:37:01.701 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.701 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 01 07:37:01.701 INFO kablam!    |
Sep 01 07:37:01.701 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.701 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.702 INFO kablam!    |
Sep 01 07:37:01.702 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.702 INFO kablam! 
Sep 01 07:37:01.703 INFO kablam! error[E0658]: The attribute `serde` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Sep 01 07:37:01.703 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/mod.rs:46:3
Sep 01 07:37:01.703 INFO kablam!    |
Sep 01 07:37:01.703 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 01 07:37:01.703 INFO kablam!    |   ^^^^^
Sep 01 07:37:01.703 INFO kablam!    |
Sep 01 07:37:01.703 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 01 07:37:01.703 INFO kablam! 
Sep 01 07:37:02.281 INFO kablam! error: aborting due to 7 previous errors
Sep 01 07:37:02.281 INFO kablam! 
Sep 01 07:37:02.281 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 01 07:37:02.318 INFO kablam! error: Could not compile `log4rs`.
Sep 01 07:37:02.318 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 01 07:37:12.561 INFO kablam! error: build failed
Sep 01 07:37:12.563 INFO kablam! su: No module specific data is present
Sep 01 07:37:13.327 INFO running `"docker" "rm" "-f" "78d9477545089a5b28f152245d6adf1f709d7c7eba057e99bae2a9d29185e9f2"`
Sep 01 07:37:13.490 INFO blam! 78d9477545089a5b28f152245d6adf1f709d7c7eba057e99bae2a9d29185e9f2