Aug 11 07:31:37.716 INFO checking nrf51-0.4.2 against try#a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195+tmplazy for libc-1
Aug 11 07:31:37.716 INFO running: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 11 07:31:37.716 INFO creating container for: cargo +a77dfcc79fe3e7e1a10ae4dccfd4b2e5e0e49195-alt check --frozen --all --all-targets
Aug 11 07:31:37.716 INFO running `"docker" "create" "-v" "/tmp/crater.WdH5SNFY8JZM:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/libc-1/worker-6/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 07:31:37.905 INFO blam! ced1b966c324962018a0b4fc3e0aab7fd8619cc9bef1bfde40f519b3e06839af
Aug 11 07:31:37.907 INFO running `"docker" "start" "-a" "ced1b966c324962018a0b4fc3e0aab7fd8619cc9bef1bfde40f519b3e06839af"`
Aug 11 07:31:39.093 INFO kablam!    Compiling cortex-m v0.4.3
Aug 11 07:31:39.093 INFO kablam!     Checking bare-metal v0.1.2
Aug 11 07:31:39.100 INFO kablam!     Checking untagged-option v0.1.1
Aug 11 07:31:39.610 INFO kablam! error[E0635]: unknown feature `const_unsafe_cell_new`
Aug 11 07:31:39.610 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/bare-metal-0.1.2/src/lib.rs:5:53
Aug 11 07:31:39.610 INFO kablam!   |
Aug 11 07:31:39.610 INFO kablam! 5 | #![cfg_attr(feature = "const-fn", feature(const_fn, const_unsafe_cell_new))]
Aug 11 07:31:39.610 INFO kablam!   |                                                     ^^^^^^^^^^^^^^^^^^^^^
Aug 11 07:31:39.611 INFO kablam! 
Aug 11 07:31:39.612 INFO kablam! error: aborting due to previous error
Aug 11 07:31:39.612 INFO kablam! 
Aug 11 07:31:39.612 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 11 07:31:39.630 INFO kablam! error: Could not compile `bare-metal`.
Aug 11 07:31:39.630 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 11 07:31:40.480 INFO kablam! error: build failed
Aug 11 07:31:40.482 INFO kablam! su: No module specific data is present
Aug 11 07:31:41.487 INFO running `"docker" "rm" "-f" "ced1b966c324962018a0b4fc3e0aab7fd8619cc9bef1bfde40f519b3e06839af"`
Aug 11 07:31:41.622 INFO blam! ced1b966c324962018a0b4fc3e0aab7fd8619cc9bef1bfde40f519b3e06839af