Aug 17 20:06:11.521 INFO checking heapless-0.3.6 against master#142bb27373126edf8367f526358b6c72ecf1d8df for pr-53426
Aug 17 20:06:11.521 INFO running: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 17 20:06:11.521 INFO creating container for: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 17 20:06:11.521 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53426/master#142bb27373126edf8367f526358b6c72ecf1d8df:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53426/worker-2/master#142bb27373126edf8367f526358b6c72ecf1d8df:/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 +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "crater"`
Aug 17 20:06:11.783 INFO blam! 57950fd497a968f877ca2c2446aaae1ba9030a715791a52a66f6c2b53c82854b
Aug 17 20:06:11.786 INFO running `"docker" "start" "-a" "57950fd497a968f877ca2c2446aaae1ba9030a715791a52a66f6c2b53c82854b"`
Aug 17 20:06:12.798 INFO kablam!     Checking hash32 v0.1.0
Aug 17 20:06:13.499 INFO kablam!     Checking heapless v0.3.6 (file:///source)
Aug 17 20:06:17.533 INFO kablam! error[E0658]: unions in const fn are unstable (see issue #51909)
Aug 17 20:06:17.533 INFO kablam!   --> src/__core.rs:43:9
Aug 17 20:06:17.533 INFO kablam!    |
Aug 17 20:06:17.533 INFO kablam! 43 |         U { none: () }.some
Aug 17 20:06:17.533 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^
Aug 17 20:06:17.536 INFO kablam!    |
Aug 17 20:06:17.536 INFO kablam!    = help: add #![feature(const_fn_union)] to the crate attributes to enable
Aug 17 20:06:17.536 INFO kablam! 
Aug 17 20:06:17.580 INFO kablam! error: aborting due to previous error
Aug 17 20:06:17.586 INFO kablam! 
Aug 17 20:06:17.587 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Aug 17 20:06:17.603 INFO kablam! error: Could not compile `heapless`.
Aug 17 20:06:17.604 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 17 20:06:19.849 INFO kablam! error[E0658]: unions in const fn are unstable (see issue #51909)
Aug 17 20:06:19.849 INFO kablam!   --> src/__core.rs:43:9
Aug 17 20:06:19.849 INFO kablam!    |
Aug 17 20:06:19.849 INFO kablam! 43 |         U { none: () }.some
Aug 17 20:06:19.849 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^
Aug 17 20:06:19.850 INFO kablam!    |
Aug 17 20:06:19.850 INFO kablam!    = help: add #![feature(const_fn_union)] to the crate attributes to enable
Aug 17 20:06:19.850 INFO kablam! 
Aug 17 20:06:19.882 INFO kablam! error: aborting due to previous error
Aug 17 20:06:19.882 INFO kablam! 
Aug 17 20:06:19.883 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Aug 17 20:06:19.893 INFO kablam! error: Could not compile `heapless`.
Aug 17 20:06:19.893 INFO kablam! 
Aug 17 20:06:19.893 INFO kablam! To learn more, run the command again with --verbose.
Aug 17 20:06:19.895 INFO kablam! su: No module specific data is present
Aug 17 20:06:20.412 INFO running `"docker" "rm" "-f" "57950fd497a968f877ca2c2446aaae1ba9030a715791a52a66f6c2b53c82854b"`
Aug 17 20:06:20.588 INFO blam! 57950fd497a968f877ca2c2446aaae1ba9030a715791a52a66f6c2b53c82854b