Sep 10 11:08:49.630 INFO checking rubrail-0.5.0 against try#3a2610c2a16575649896925631bf8cec4f4b1961 for pr-54090
Sep 10 11:08:49.630 INFO running: cargo +3a2610c2a16575649896925631bf8cec4f4b1961-alt check --frozen --all --all-targets
Sep 10 11:08:49.630 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-54090/try#3a2610c2a16575649896925631bf8cec4f4b1961:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-0/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 11:08:49.846 INFO blam! 77b6cdba0161a11704be186372e0c5fd52ae39d82ba47ff3f969c9b6bcbe6f31
Sep 10 11:08:49.848 INFO running `"docker" "start" "-a" "77b6cdba0161a11704be186372e0c5fd52ae39d82ba47ff3f969c9b6bcbe6f31"`
Sep 10 11:08:50.768 INFO kablam! usermod: no changes
Sep 10 11:08:50.918 INFO kablam!    Compiling rubrail v0.5.0 (file:///source)
Sep 10 11:08:50.922 INFO kablam!     Checking ordered-float v0.4.0
Sep 10 11:08:51.462 INFO kablam!     Checking serde-value v0.4.1
Sep 10 11:08:52.076 INFO kablam!     Checking log4rs v0.6.3
Sep 10 11:08:52.771 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 10 11:08:52.772 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/file.rs:25:3
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/console.rs:24:3
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.772 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 10 11:08:52.772 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.6.3/src/append/rolling_file/mod.rs:46:3
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 10 11:08:52.772 INFO kablam!    |   ^^^^^
Sep 10 11:08:52.772 INFO kablam!    |
Sep 10 11:08:52.772 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 11:08:52.772 INFO kablam! 
Sep 10 11:08:52.854 INFO kablam! error: aborting due to 7 previous errors
Sep 10 11:08:52.854 INFO kablam! 
Sep 10 11:08:52.854 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 10 11:08:52.864 INFO kablam! error: Could not compile `log4rs`.
Sep 10 11:08:52.864 INFO kablam! 
Sep 10 11:08:52.864 INFO kablam! To learn more, run the command again with --verbose.
Sep 10 11:08:52.864 INFO kablam! su: No module specific data is present
Sep 10 11:08:53.567 INFO running `"docker" "rm" "-f" "77b6cdba0161a11704be186372e0c5fd52ae39d82ba47ff3f969c9b6bcbe6f31"`
Sep 10 11:08:53.673 INFO blam! 77b6cdba0161a11704be186372e0c5fd52ae39d82ba47ff3f969c9b6bcbe6f31