Aug 11 01:10:24.716 INFO checking ssd1351-0.1.0 against try#a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195+tmplazy for libc-1
Aug 11 01:10:24.716 INFO running: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 11 01:10:24.716 INFO creating container for: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 11 01:10:24.716 INFO running `"docker" "create" "-v" "/tmp/crater.9Q2fxnopcCPh:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/libc-1/worker-2/try#a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195+tmplazy:/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" "-v" "/home/ec2-user/crater/./work/local/cargo-home/git:/cargo-home/git:rw,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "crater"`
Aug 11 01:10:24.965 INFO blam! e02865bb96901dbf657837ca92dda69d0a000a5c2dfd4f3b02e0c0444d5884cb
Aug 11 01:10:24.967 INFO running `"docker" "start" "-a" "e02865bb96901dbf657837ca92dda69d0a000a5c2dfd4f3b02e0c0444d5884cb"`
Aug 11 01:10:25.873 INFO kablam!    Compiling cc v1.0.18
Aug 11 01:10:25.873 INFO kablam!     Checking vcell v0.1.0
Aug 11 01:10:25.876 INFO kablam!    Compiling typenum v1.10.0
Aug 11 01:10:25.876 INFO kablam!     Checking bare-metal v0.2.1
Aug 11 01:10:25.876 INFO kablam!     Checking r0 v0.2.2
Aug 11 01:10:25.876 INFO kablam!    Compiling stm32l4 v0.2.2
Aug 11 01:10:25.876 INFO kablam!     Checking aligned v0.2.0
Aug 11 01:10:25.876 INFO kablam!     Checking byteorder v1.2.4
Aug 11 01:10:26.103 INFO kablam!     Checking nb v0.1.1
Aug 11 01:10:26.240 INFO kablam!     Checking void v1.0.2
Aug 11 01:10:26.282 INFO kablam!     Checking embedded-graphics v0.3.0
Aug 11 01:10:26.500 INFO kablam!     Checking cast v0.2.2
Aug 11 01:10:26.879 INFO kablam!     Checking volatile-register v0.2.0
Aug 11 01:10:27.550 INFO kablam!     Checking embedded-hal v0.2.1
Aug 11 01:10:28.690 INFO kablam!     Checking hash32 v0.1.0
Aug 11 01:10:30.754 INFO kablam!     Checking ssd1351 v0.1.0 (file:///source)
Aug 11 01:10:38.201 INFO kablam!     Checking generic-array v0.11.1
Aug 11 01:10:40.378 INFO kablam!     Checking heapless v0.3.6
Aug 11 01:10:41.503 INFO kablam!    Compiling cortex-m-rt v0.5.1
Aug 11 01:10:41.503 INFO kablam!    Compiling cortex-m v0.5.3
Aug 11 01:10:41.504 INFO kablam!    Compiling cortex-m-semihosting v0.3.0
Aug 11 01:10:43.887 INFO kablam! error[E0658]: unions in const fn are unstable (see issue #51909)
Aug 11 01:10:43.887 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/heapless-0.3.6/src/__core.rs:43:9
Aug 11 01:10:43.887 INFO kablam!    |
Aug 11 01:10:43.887 INFO kablam! 43 |         U { none: () }.some
Aug 11 01:10:43.888 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^
Aug 11 01:10:43.888 INFO kablam!    |
Aug 11 01:10:43.888 INFO kablam!    = help: add #![feature(const_fn_union)] to the crate attributes to enable
Aug 11 01:10:43.888 INFO kablam! 
Aug 11 01:10:43.905 INFO kablam! error: aborting due to previous error
Aug 11 01:10:43.905 INFO kablam! 
Aug 11 01:10:43.905 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Aug 11 01:10:43.911 INFO kablam! error: Could not compile `heapless`.
Aug 11 01:10:43.912 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 11 01:10:43.978 INFO kablam! error: build failed
Aug 11 01:10:43.980 INFO kablam! su: No module specific data is present
Aug 11 01:10:44.571 INFO running `"docker" "rm" "-f" "e02865bb96901dbf657837ca92dda69d0a000a5c2dfd4f3b02e0c0444d5884cb"`
Aug 11 01:10:44.694 INFO blam! e02865bb96901dbf657837ca92dda69d0a000a5c2dfd4f3b02e0c0444d5884cb