Aug 10 23:50:46.953 INFO checking tm4c123x-0.4.0 against try#a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195+tmplazy for libc-1
Aug 10 23:50:46.953 INFO running: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 10 23:50:46.953 INFO creating container for: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 10 23:50:46.954 INFO running `"docker" "create" "-v" "/tmp/crater.QrduSijGpcGW:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/libc-1/worker-4/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 10 23:50:47.154 INFO blam! 5a8e66939f7edd006671735ac230e607c575b4f68c0483041c25261a3b21e4d0
Aug 10 23:50:47.156 INFO running `"docker" "start" "-a" "5a8e66939f7edd006671735ac230e607c575b4f68c0483041c25261a3b21e4d0"`
Aug 10 23:50:48.423 INFO kablam!    Compiling cortex-m v0.2.12
Aug 10 23:50:48.425 INFO kablam!     Checking cortex-m-semihosting v0.1.3
Aug 10 23:50:50.588 INFO kablam! error[E0635]: unknown feature `const_unsafe_cell_new`
Aug 10 23:50:50.589 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/cortex-m-0.2.12/src/lib.rs:16:12
Aug 10 23:50:50.589 INFO kablam!    |
Aug 10 23:50:50.589 INFO kablam! 16 | #![feature(const_unsafe_cell_new)]
Aug 10 23:50:50.589 INFO kablam!    |            ^^^^^^^^^^^^^^^^^^^^^
Aug 10 23:50:50.589 INFO kablam! 
Aug 10 23:50:50.617 INFO kablam! error: aborting due to previous error
Aug 10 23:50:50.617 INFO kablam! 
Aug 10 23:50:50.617 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 10 23:50:50.621 INFO kablam! error: Could not compile `cortex-m`.
Aug 10 23:50:50.622 INFO kablam! 
Aug 10 23:50:50.622 INFO kablam! To learn more, run the command again with --verbose.
Aug 10 23:50:50.623 INFO kablam! su: No module specific data is present
Aug 10 23:50:51.271 INFO running `"docker" "rm" "-f" "5a8e66939f7edd006671735ac230e607c575b4f68c0483041c25261a3b21e4d0"`
Aug 10 23:50:51.437 INFO blam! 5a8e66939f7edd006671735ac230e607c575b4f68c0483041c25261a3b21e4d0