Sep 06 10:01:45.850 INFO checking amqpr-api-0.4.1 against try#51ff957df5095d92d1d3d4682207ee8b7ad408a8 for pr-53854
Sep 06 10:01:45.850 INFO running: cargo +51ff957df5095d92d1d3d4682207ee8b7ad408a8-alt check --frozen --all --all-targets
Sep 06 10:01:45.850 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-7/pr-53854/try#51ff957df5095d92d1d3d4682207ee8b7ad408a8:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53854/worker-7/try#51ff957df5095d92d1d3d4682207ee8b7ad408a8:/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 +51ff957df5095d92d1d3d4682207ee8b7ad408a8-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 06 10:01:46.043 INFO blam! 1890aaf1e11aecf70e6467b4611fa917ceef85f3d4bd6dc24aadb94b2fd5bd4e
Sep 06 10:01:46.044 INFO running `"docker" "start" "-a" "1890aaf1e11aecf70e6467b4611fa917ceef85f3d4bd6dc24aadb94b2fd5bd4e"`
Sep 06 10:01:47.353 INFO kablam! usermod: no changes
Sep 06 10:01:47.470 INFO kablam!     Checking amqpr-codec v0.3.2
Sep 06 10:01:47.470 INFO kablam!     Checking log4rs v0.7.0
Sep 06 10:01:48.398 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 06 10:01:48.398 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/file.rs:25:3
Sep 06 10:01:48.398 INFO kablam!    |
Sep 06 10:01:48.398 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.398 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.398 INFO kablam!    |
Sep 06 10:01:48.398 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.398 INFO kablam! 
Sep 06 10:01:48.398 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 06 10:01:48.399 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/console.rs:24:3
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.399 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 06 10:01:48.399 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 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.399 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 06 10:01:48.399 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 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.399 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 06 10:01:48.399 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 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.399 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 06 10:01:48.399 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.399 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 06 10:01:48.399 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/mod.rs:46:3
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 06 10:01:48.399 INFO kablam!    |   ^^^^^
Sep 06 10:01:48.399 INFO kablam!    |
Sep 06 10:01:48.399 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 06 10:01:48.399 INFO kablam! 
Sep 06 10:01:48.538 INFO kablam! error: aborting due to 7 previous errors
Sep 06 10:01:48.538 INFO kablam! 
Sep 06 10:01:48.538 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 06 10:01:48.565 INFO kablam! error: Could not compile `log4rs`.
Sep 06 10:01:48.565 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 06 10:01:48.876 INFO kablam! error: build failed
Sep 06 10:01:48.877 INFO kablam! su: No module specific data is present
Sep 06 10:01:50.028 INFO running `"docker" "rm" "-f" "1890aaf1e11aecf70e6467b4611fa917ceef85f3d4bd6dc24aadb94b2fd5bd4e"`
Sep 06 10:01:50.123 INFO blam! 1890aaf1e11aecf70e6467b4611fa917ceef85f3d4bd6dc24aadb94b2fd5bd4e