Aug 17 17:06:28.181 INFO checking microbit-0.5.4 against master#142bb27373126edf8367f526358b6c72ecf1d8df for pr-53426
Aug 17 17:06:28.181 INFO running: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 17 17:06:28.181 INFO creating container for: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 17 17:06:28.181 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-7/pr-53426/master#142bb27373126edf8367f526358b6c72ecf1d8df:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53426/worker-7/master#142bb27373126edf8367f526358b6c72ecf1d8df:/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 +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "crater"`
Aug 17 17:06:28.442 INFO blam! ef642c294b5efdb3e682e8c975f819d890d9c8aae69b7c8820d8274dd19e484e
Aug 17 17:06:28.446 INFO running `"docker" "start" "-a" "ef642c294b5efdb3e682e8c975f819d890d9c8aae69b7c8820d8274dd19e484e"`
Aug 17 17:06:29.351 INFO kablam!    Compiling nrf51 v0.5.0
Aug 17 17:06:29.361 INFO kablam!     Checking bare-metal v0.2.1
Aug 17 17:06:29.361 INFO kablam!     Checking panic-abort v0.2.0
Aug 17 17:06:29.361 INFO kablam!     Checking rand_core v0.2.1
Aug 17 17:06:29.362 INFO kablam!     Checking dcf77 v0.1.0
Aug 17 17:06:29.362 INFO kablam!     Checking numtoa v0.0.7
Aug 17 17:06:29.362 INFO kablam!    Compiling cortex-m-rt v0.5.2
Aug 17 17:06:29.362 INFO kablam!    Compiling cortex-m-semihosting v0.3.0
Aug 17 17:06:30.219 INFO kablam! error[E0635]: unknown feature `const_unsafe_cell_new`
Aug 17 17:06:30.219 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/bare-metal-0.2.1/src/lib.rs:7:23
Aug 17 17:06:30.219 INFO kablam!   |
Aug 17 17:06:30.219 INFO kablam! 7 |     feature(const_fn, const_unsafe_cell_new)
Aug 17 17:06:30.219 INFO kablam!   |                       ^^^^^^^^^^^^^^^^^^^^^
Aug 17 17:06:30.219 INFO kablam! 
Aug 17 17:06:30.221 INFO kablam! error: aborting due to previous error
Aug 17 17:06:30.222 INFO kablam! 
Aug 17 17:06:30.222 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 17 17:06:30.230 INFO kablam! error: Could not compile `bare-metal`.
Aug 17 17:06:30.230 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 17 17:06:32.835 INFO kablam! error: build failed
Aug 17 17:06:32.837 INFO kablam! su: No module specific data is present
Aug 17 17:06:33.294 INFO running `"docker" "rm" "-f" "ef642c294b5efdb3e682e8c975f819d890d9c8aae69b7c8820d8274dd19e484e"`
Aug 17 17:06:33.432 INFO blam! ef642c294b5efdb3e682e8c975f819d890d9c8aae69b7c8820d8274dd19e484e