Sep 04 05:31:20.913 INFO checking rubrail-0.5.0 against try#6b43b862fabb13a0ce2a5371ea1e77ee1674b7e0 for pr-53893
Sep 04 05:31:20.913 INFO running: cargo +6b43b862fabb13a0ce2a5371ea1e77ee1674b7e0-alt check --frozen --all --all-targets
Sep 04 05:31:20.913 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53893/try#6b43b862fabb13a0ce2a5371ea1e77ee1674b7e0:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53893/worker-0/try#6b43b862fabb13a0ce2a5371ea1e77ee1674b7e0:/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 +6b43b862fabb13a0ce2a5371ea1e77ee1674b7e0-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 04 05:31:21.134 INFO blam! 9ca3f744a6f18395457296aee035c195f134c78e6bb49d09d4211a198045c38c
Sep 04 05:31:21.136 INFO running `"docker" "start" "-a" "9ca3f744a6f18395457296aee035c195f134c78e6bb49d09d4211a198045c38c"`
Sep 04 05:31:21.960 INFO kablam!    Compiling rubrail v0.5.0 (file:///source)
Sep 04 05:31:21.962 INFO kablam!     Checking serde_yaml v0.6.2
Sep 04 05:31:21.963 INFO kablam!     Checking ordered-float v0.4.0
Sep 04 05:31:23.311 INFO kablam!     Checking serde-value v0.4.1
Sep 04 05:31:24.726 INFO kablam!     Checking log4rs v0.6.3
Sep 04 05:31:26.174 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 04 05:31:26.174 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/file.rs:25:3
Sep 04 05:31:26.174 INFO kablam!    |
Sep 04 05:31:26.174 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.174 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.174 INFO kablam!    |
Sep 04 05:31:26.174 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.174 INFO kablam! 
Sep 04 05:31:26.175 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 04 05:31:26.175 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/console.rs:24:3
Sep 04 05:31:26.175 INFO kablam!    |
Sep 04 05:31:26.175 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.175 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.175 INFO kablam!    |
Sep 04 05:31:26.175 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.175 INFO kablam! 
Sep 04 05:31:26.175 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 04 05:31:26.175 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/policy/compound/roll/delete.rs:16:3
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.176 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.176 INFO kablam! 
Sep 04 05:31:26.176 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 04 05:31:26.176 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/policy/compound/roll/fixed_window.rs:17:3
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.176 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.176 INFO kablam! 
Sep 04 05:31:26.176 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 04 05:31:26.176 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/policy/compound/trigger/size.rs:21:3
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.176 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.176 INFO kablam!    |
Sep 04 05:31:26.176 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.176 INFO kablam! 
Sep 04 05:31:26.176 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 04 05:31:26.177 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 04 05:31:26.177 INFO kablam!    |
Sep 04 05:31:26.177 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.177 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.177 INFO kablam!    |
Sep 04 05:31:26.177 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.177 INFO kablam! 
Sep 04 05:31:26.177 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 04 05:31:26.177 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/mod.rs:46:3
Sep 04 05:31:26.177 INFO kablam!    |
Sep 04 05:31:26.177 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 04 05:31:26.177 INFO kablam!    |   ^^^^^
Sep 04 05:31:26.177 INFO kablam!    |
Sep 04 05:31:26.177 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 04 05:31:26.177 INFO kablam! 
Sep 04 05:31:26.243 INFO kablam! error: aborting due to 7 previous errors
Sep 04 05:31:26.243 INFO kablam! 
Sep 04 05:31:26.243 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 04 05:31:26.257 INFO kablam! error: Could not compile `log4rs`.
Sep 04 05:31:26.257 INFO kablam! 
Sep 04 05:31:26.257 INFO kablam! To learn more, run the command again with --verbose.
Sep 04 05:31:26.261 INFO kablam! su: No module specific data is present
Sep 04 05:31:26.751 INFO running `"docker" "rm" "-f" "9ca3f744a6f18395457296aee035c195f134c78e6bb49d09d4211a198045c38c"`
Sep 04 05:31:26.899 INFO blam! 9ca3f744a6f18395457296aee035c195f134c78e6bb49d09d4211a198045c38c