Sep 10 20:57:09.170 INFO checking connect-0.1.1 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 20:57:09.170 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 20:57:09.170 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-2/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/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 +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-m" "2G" "crater"`
Sep 10 20:57:09.373 INFO blam! 5e608072ddadc84346c930716d253ee8f89e1ea27100ac85b04dc7186d7e6da3
Sep 10 20:57:09.375 INFO running `"docker" "start" "-a" "5e608072ddadc84346c930716d253ee8f89e1ea27100ac85b04dc7186d7e6da3"`
Sep 10 20:57:10.142 INFO kablam! usermod: no changes
Sep 10 20:57:10.508 INFO kablam!     Checking bytes v0.4.10
Sep 10 20:57:10.508 INFO kablam!     Checking mio v0.6.16
Sep 10 20:57:10.508 INFO kablam!     Checking log4rs v0.8.0
Sep 10 20:57:10.509 INFO kablam!     Checking config v0.8.0
Sep 10 20:57:12.520 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 20:57:12.520 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/file.rs:25:3
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.520 INFO kablam! 
Sep 10 20:57:12.520 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 20:57:12.520 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/console.rs:24:3
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.520 INFO kablam! 
Sep 10 20:57:12.520 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 20:57:12.520 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 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.520 INFO kablam! 
Sep 10 20:57:12.520 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 20:57:12.520 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 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.520 INFO kablam! 
Sep 10 20:57:12.520 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 20:57:12.520 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 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.520 INFO kablam! 
Sep 10 20:57:12.520 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 20:57:12.520 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/policy/compound/mod.rs:24:3
Sep 10 20:57:12.520 INFO kablam!    |
Sep 10 20:57:12.520 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.520 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.521 INFO kablam!    |
Sep 10 20:57:12.521 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.521 INFO kablam! 
Sep 10 20:57:12.521 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 20:57:12.521 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.8.0/src/append/rolling_file/mod.rs:46:3
Sep 10 20:57:12.521 INFO kablam!    |
Sep 10 20:57:12.521 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Sep 10 20:57:12.521 INFO kablam!    |   ^^^^^
Sep 10 20:57:12.521 INFO kablam!    |
Sep 10 20:57:12.521 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Sep 10 20:57:12.521 INFO kablam! 
Sep 10 20:57:12.591 INFO kablam! error: aborting due to 7 previous errors
Sep 10 20:57:12.591 INFO kablam! 
Sep 10 20:57:12.591 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 10 20:57:12.597 INFO kablam! error: Could not compile `log4rs`.
Sep 10 20:57:12.597 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 10 20:57:13.904 INFO kablam! error: build failed
Sep 10 20:57:13.905 INFO kablam! su: No module specific data is present
Sep 10 20:57:14.434 INFO running `"docker" "rm" "-f" "5e608072ddadc84346c930716d253ee8f89e1ea27100ac85b04dc7186d7e6da3"`
Sep 10 20:57:14.538 INFO blam! 5e608072ddadc84346c930716d253ee8f89e1ea27100ac85b04dc7186d7e6da3