Sep 02 02:09:50.275 INFO checking rubrail-0.7.0 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53851
Sep 02 02:09:50.275 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 02 02:09:50.276 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-1/pr-53851/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53851/worker-1/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 02 02:09:50.481 INFO blam! f188afd91603c836302a486531779d6b92d3dfb92fbee6463a5bc0caf178b31a
Sep 02 02:09:50.483 INFO running `"docker" "start" "-a" "f188afd91603c836302a486531779d6b92d3dfb92fbee6463a5bc0caf178b31a"`
Sep 02 02:09:51.499 INFO kablam!    Compiling rubrail v0.7.0 (file:///source)
Sep 02 02:09:51.502 INFO kablam!     Checking log4rs v0.8.0
Sep 02 02:09:52.957 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 02 02:09:52.957 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/file.rs:25:3
Sep 02 02:09:52.957 INFO kablam!    |
Sep 02 02:09:52.957 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.958 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.958 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.958 INFO kablam! 
Sep 02 02:09:52.958 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 02 02:09:52.958 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/console.rs:24:3
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.958 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.958 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.958 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.958 INFO kablam! 
Sep 02 02:09:52.958 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 02 02:09:52.958 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/policy/compound/roll/delete.rs:16:3
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.958 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.958 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.958 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.958 INFO kablam! 
Sep 02 02:09:52.958 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 02 02:09:52.958 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/policy/compound/roll/fixed_window.rs:17:3
Sep 02 02:09:52.958 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.959 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.959 INFO kablam! 
Sep 02 02:09:52.959 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 02 02:09:52.959 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/policy/compound/trigger/size.rs:21:3
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.959 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.959 INFO kablam! 
Sep 02 02:09:52.959 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 02 02:09:52.959 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.959 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.959 INFO kablam! 
Sep 02 02:09:52.959 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 02 02:09:52.959 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/mod.rs:46:3
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 02 02:09:52.959 INFO kablam!    |   ^^^^^
Sep 02 02:09:52.959 INFO kablam!    |
Sep 02 02:09:52.959 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 02 02:09:52.959 INFO kablam! 
Sep 02 02:09:53.071 INFO kablam! error: aborting due to 7 previous errors
Sep 02 02:09:53.071 INFO kablam! 
Sep 02 02:09:53.071 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 02 02:09:53.086 INFO kablam! error: Could not compile `log4rs`.
Sep 02 02:09:53.086 INFO kablam! 
Sep 02 02:09:53.086 INFO kablam! To learn more, run the command again with --verbose.
Sep 02 02:09:53.088 INFO kablam! su: No module specific data is present
Sep 02 02:09:53.670 INFO running `"docker" "rm" "-f" "f188afd91603c836302a486531779d6b92d3dfb92fbee6463a5bc0caf178b31a"`
Sep 02 02:09:53.823 INFO blam! f188afd91603c836302a486531779d6b92d3dfb92fbee6463a5bc0caf178b31a