Sep 21 01:44:42.800 INFO checking tm4c123x-0.4.0 against master#f7f4c500b46603386e940f116b469c7adc043a6d for pr-54394
Sep 21 01:44:42.800 INFO running: cargo +f7f4c500b46603386e940f116b469c7adc043a6d-alt check --frozen --all --all-targets
Sep 21 01:44:42.800 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-54394/master#f7f4c500b46603386e940f116b469c7adc043a6d:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54394/worker-3/master#f7f4c500b46603386e940f116b469c7adc043a6d:/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 +f7f4c500b46603386e940f116b469c7adc043a6d-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 21 01:44:43.231 INFO blam! 99c6ff3bec12889f6c15a9dc8072cabf7add2f264129405a57b619886931af74
Sep 21 01:44:43.233 INFO running `"docker" "start" "-a" "99c6ff3bec12889f6c15a9dc8072cabf7add2f264129405a57b619886931af74"`
Sep 21 01:44:45.122 INFO kablam! usermod: no changes
Sep 21 01:44:45.162 INFO kablam!    Compiling cortex-m v0.2.12
Sep 21 01:44:45.162 INFO kablam!     Checking cortex-m-semihosting v0.1.3
Sep 21 01:44:46.294 INFO kablam! error[E0635]: unknown feature `const_unsafe_cell_new`
Sep 21 01:44:46.294 INFO kablam!   --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/cortex-m-0.2.12/src/lib.rs:16:12
Sep 21 01:44:46.294 INFO kablam!    |
Sep 21 01:44:46.294 INFO kablam! 16 | #![feature(const_unsafe_cell_new)]
Sep 21 01:44:46.294 INFO kablam!    |            ^^^^^^^^^^^^^^^^^^^^^
Sep 21 01:44:46.294 INFO kablam! 
Sep 21 01:44:46.305 INFO kablam! error: aborting due to previous error
Sep 21 01:44:46.305 INFO kablam! 
Sep 21 01:44:46.305 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 21 01:44:46.306 INFO kablam! error: Could not compile `cortex-m`.
Sep 21 01:44:46.306 INFO kablam! 
Sep 21 01:44:46.306 INFO kablam! To learn more, run the command again with --verbose.
Sep 21 01:44:46.308 INFO kablam! su: No module specific data is present
Sep 21 01:44:47.310 INFO running `"docker" "rm" "-f" "99c6ff3bec12889f6c15a9dc8072cabf7add2f264129405a57b619886931af74"`
Sep 21 01:44:47.421 INFO blam! 99c6ff3bec12889f6c15a9dc8072cabf7add2f264129405a57b619886931af74