Sep 10 20:55:45.075 INFO checking const-concat-0.1.0 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 20:55:45.075 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 20:55:45.075 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-4/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 20:55:45.284 INFO blam! 36d747f52a6a4d2a7796403579836a1d7a2149325fa6fbcea7008b4a32b9a2dd
Sep 10 20:55:45.286 INFO running `"docker" "start" "-a" "36d747f52a6a4d2a7796403579836a1d7a2149325fa6fbcea7008b4a32b9a2dd"`
Sep 10 20:55:46.368 INFO kablam! usermod: no changes
Sep 10 20:55:46.438 INFO kablam!     Checking const-concat v0.1.0 (file:///source)
Sep 10 20:55:46.846 INFO kablam! error[E0658]: unions in const fn are unstable (see issue #51909)
Sep 10 20:55:46.846 INFO kablam!   --> src/lib.rs:10:5
Sep 10 20:55:46.846 INFO kablam!    |
Sep 10 20:55:46.846 INFO kablam! 10 |     Transmute { from }.to
Sep 10 20:55:46.846 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^
Sep 10 20:55:46.846 INFO kablam!    |
Sep 10 20:55:46.846 INFO kablam!    = help: add #![feature(const_fn_union)] to the crate attributes to enable
Sep 10 20:55:46.846 INFO kablam! 
Sep 10 20:55:46.910 INFO kablam! error[E0308]: mismatched types
Sep 10 20:55:46.910 INFO kablam!   --> src/lib.rs:33:13
Sep 10 20:55:46.910 INFO kablam!    |
Sep 10 20:55:46.910 INFO kablam! 33 | /             &$crate::concat::<
Sep 10 20:55:46.910 INFO kablam! 34 | |                 [u8; $a.len()],
Sep 10 20:55:46.910 INFO kablam! 35 | |                 [u8; $b.len()],
Sep 10 20:55:46.910 INFO kablam! 36 | |                 [u8; $a.len() + $b.len()],
Sep 10 20:55:46.910 INFO kablam! 37 | |             >($a.as_bytes(), $b.as_bytes())
Sep 10 20:55:46.910 INFO kablam!    | |___________________________________________^ expected slice, found array
Sep 10 20:55:46.910 INFO kablam! ...
Sep 10 20:55:46.910 INFO kablam! 57 |           const GREETING: &str = const_concat!(SALUTATION, ", ", TARGET, "!");
Sep 10 20:55:46.910 INFO kablam!    |                                  -------------------------------------------- in this macro invocation
Sep 10 20:55:46.910 INFO kablam!    |
Sep 10 20:55:46.910 INFO kablam!    = note: expected type `&'static [u8]`
Sep 10 20:55:46.910 INFO kablam!               found type `&[u8; _]`
Sep 10 20:55:46.910 INFO kablam! 
Sep 10 20:55:46.922 INFO kablam! error: aborting due to 2 previous errors
Sep 10 20:55:46.922 INFO kablam! 
Sep 10 20:55:46.922 INFO kablam! Some errors occurred: E0308, E0658.
Sep 10 20:55:46.922 INFO kablam! For more information about an error, try `rustc --explain E0308`.
Sep 10 20:55:46.925 INFO kablam! error: Could not compile `const-concat`.
Sep 10 20:55:46.925 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 10 20:55:46.946 INFO kablam! error[E0658]: unions in const fn are unstable (see issue #51909)
Sep 10 20:55:46.946 INFO kablam!   --> src/lib.rs:10:5
Sep 10 20:55:46.946 INFO kablam!    |
Sep 10 20:55:46.946 INFO kablam! 10 |     Transmute { from }.to
Sep 10 20:55:46.946 INFO kablam!    |     ^^^^^^^^^^^^^^^^^^^^^
Sep 10 20:55:46.946 INFO kablam!    |
Sep 10 20:55:46.946 INFO kablam!    = help: add #![feature(const_fn_union)] to the crate attributes to enable
Sep 10 20:55:46.946 INFO kablam! 
Sep 10 20:55:46.946 INFO kablam! error: aborting due to previous error
Sep 10 20:55:46.946 INFO kablam! 
Sep 10 20:55:46.946 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 10 20:55:46.949 INFO kablam! error: Could not compile `const-concat`.
Sep 10 20:55:46.949 INFO kablam! 
Sep 10 20:55:46.949 INFO kablam! To learn more, run the command again with --verbose.
Sep 10 20:55:46.950 INFO kablam! su: No module specific data is present
Sep 10 20:55:47.720 INFO running `"docker" "rm" "-f" "36d747f52a6a4d2a7796403579836a1d7a2149325fa6fbcea7008b4a32b9a2dd"`
Sep 10 20:55:47.822 INFO blam! 36d747f52a6a4d2a7796403579836a1d7a2149325fa6fbcea7008b4a32b9a2dd