Aug 31 10:59:48.320 INFO checking tm4c123x-0.4.0 against try#a5b9f2cc0cdaca8edf23a89c649279de2c91cd3b for pr-53578
Aug 31 10:59:48.321 INFO running: cargo +a5b9f2cc0cdaca8edf23a89c649279de2c91cd3b-alt check --frozen --all --all-targets
Aug 31 10:59:48.321 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53578/try#a5b9f2cc0cdaca8edf23a89c649279de2c91cd3b:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53578/worker-0/try#a5b9f2cc0cdaca8edf23a89c649279de2c91cd3b:/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 +a5b9f2cc0cdaca8edf23a89c649279de2c91cd3b-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Aug 31 10:59:48.541 INFO blam! ddd8f6c644fc50da065415e77391f9182e70ef411fb5697dfc3340fd554008f4
Aug 31 10:59:48.544 INFO running `"docker" "start" "-a" "ddd8f6c644fc50da065415e77391f9182e70ef411fb5697dfc3340fd554008f4"`
Aug 31 10:59:49.217 INFO kablam!    Compiling cortex-m v0.2.12
Aug 31 10:59:49.218 INFO kablam!     Checking cortex-m-semihosting v0.1.3
Aug 31 10:59:50.850 INFO kablam! error[E0635]: unknown feature `const_unsafe_cell_new`
Aug 31 10:59:50.850 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/cortex-m-0.2.12/src/lib.rs:16:12
Aug 31 10:59:50.850 INFO kablam!    |
Aug 31 10:59:50.850 INFO kablam! 16 | #![feature(const_unsafe_cell_new)]
Aug 31 10:59:50.850 INFO kablam!    |            ^^^^^^^^^^^^^^^^^^^^^
Aug 31 10:59:50.850 INFO kablam! 
Aug 31 10:59:50.879 INFO kablam! error: aborting due to previous error
Aug 31 10:59:50.880 INFO kablam! 
Aug 31 10:59:50.880 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 31 10:59:50.888 INFO kablam! error: Could not compile `cortex-m`.
Aug 31 10:59:50.888 INFO kablam! 
Aug 31 10:59:50.888 INFO kablam! To learn more, run the command again with --verbose.
Aug 31 10:59:50.890 INFO kablam! su: No module specific data is present
Aug 31 10:59:51.345 INFO running `"docker" "rm" "-f" "ddd8f6c644fc50da065415e77391f9182e70ef411fb5697dfc3340fd554008f4"`
Aug 31 10:59:51.486 INFO blam! ddd8f6c644fc50da065415e77391f9182e70ef411fb5697dfc3340fd554008f4