Aug 30 20:51:15.405 INFO checking crust-0.31.0 against try#2d477f9981361618ac78253c28051a66b6cea125 for pr-53707
Aug 30 20:51:15.405 INFO running: cargo +2d477f9981361618ac78253c28051a66b6cea125-alt check --frozen --all --all-targets
Aug 30 20:51:15.405 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53707/try#2d477f9981361618ac78253c28051a66b6cea125:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53707/worker-0/try#2d477f9981361618ac78253c28051a66b6cea125:/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 +2d477f9981361618ac78253c28051a66b6cea125-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Aug 30 20:51:15.554 INFO blam! c0149ba7edbffb90d94203c8e0bcf9a861231cd0ef6708fa97ebc21c25ba2274
Aug 30 20:51:15.556 INFO running `"docker" "start" "-a" "c0149ba7edbffb90d94203c8e0bcf9a861231cd0ef6708fa97ebc21c25ba2274"`
Aug 30 20:51:16.582 INFO kablam!    Compiling base64 v0.9.2
Aug 30 20:51:16.585 INFO kablam!    Compiling bytes v0.4.9
Aug 30 20:51:16.591 INFO kablam!    Compiling libflate v0.1.16
Aug 30 20:51:16.593 INFO kablam!    Compiling serde_urlencoded v0.5.3
Aug 30 20:51:16.598 INFO kablam!     Checking igd v0.6.0
Aug 30 20:51:16.601 INFO kablam!     Checking log4rs v0.7.0
Aug 30 20:51:21.355 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)
Aug 30 20:51:21.355 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/file.rs:25:3
Aug 30 20:51:21.356 INFO kablam!    |
Aug 30 20:51:21.356 INFO kablam! 25 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.356 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.356 INFO kablam!    |
Aug 30 20:51:21.356 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.356 INFO kablam! 
Aug 30 20:51:21.356 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)
Aug 30 20:51:21.356 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/console.rs:24:3
Aug 30 20:51:21.356 INFO kablam!    |
Aug 30 20:51:21.356 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.356 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.360 INFO kablam!    |
Aug 30 20:51:21.360 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.360 INFO kablam! 
Aug 30 20:51:21.361 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)
Aug 30 20:51:21.361 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/roll/delete.rs:16:3
Aug 30 20:51:21.361 INFO kablam!    |
Aug 30 20:51:21.361 INFO kablam! 16 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.361 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.361 INFO kablam!    |
Aug 30 20:51:21.361 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.361 INFO kablam! 
Aug 30 20:51:21.361 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)
Aug 30 20:51:21.361 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
Aug 30 20:51:21.361 INFO kablam!    |
Aug 30 20:51:21.361 INFO kablam! 17 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.361 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.362 INFO kablam!    |
Aug 30 20:51:21.362 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.362 INFO kablam! 
Aug 30 20:51:21.362 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)
Aug 30 20:51:21.362 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/trigger/size.rs:21:3
Aug 30 20:51:21.362 INFO kablam!    |
Aug 30 20:51:21.362 INFO kablam! 21 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.363 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.363 INFO kablam!    |
Aug 30 20:51:21.363 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.363 INFO kablam! 
Aug 30 20:51:21.363 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)
Aug 30 20:51:21.363 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/policy/compound/mod.rs:24:3
Aug 30 20:51:21.363 INFO kablam!    |
Aug 30 20:51:21.363 INFO kablam! 24 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.363 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.363 INFO kablam!    |
Aug 30 20:51:21.363 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.365 INFO kablam! 
Aug 30 20:51:21.365 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)
Aug 30 20:51:21.365 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/log4rs-0.7.0/src/append/rolling_file/mod.rs:46:3
Aug 30 20:51:21.365 INFO kablam!    |
Aug 30 20:51:21.365 INFO kablam! 46 | #[serde(deny_unknown_fields)]
Aug 30 20:51:21.365 INFO kablam!    |   ^^^^^
Aug 30 20:51:21.365 INFO kablam!    |
Aug 30 20:51:21.365 INFO kablam!    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Aug 30 20:51:21.365 INFO kablam! 
Aug 30 20:51:21.729 INFO kablam! error: aborting due to 7 previous errors
Aug 30 20:51:21.729 INFO kablam! 
Aug 30 20:51:21.729 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Aug 30 20:51:21.761 INFO kablam! error: Could not compile `log4rs`.
Aug 30 20:51:21.761 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 30 20:51:25.884 INFO kablam! error: build failed
Aug 30 20:51:25.886 INFO kablam! su: No module specific data is present
Aug 30 20:51:26.445 INFO running `"docker" "rm" "-f" "c0149ba7edbffb90d94203c8e0bcf9a861231cd0ef6708fa97ebc21c25ba2274"`
Aug 30 20:51:26.592 INFO blam! c0149ba7edbffb90d94203c8e0bcf9a861231cd0ef6708fa97ebc21c25ba2274