Dec 18 14:40:25.661 INFO checking keymatrix-0.1.2 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 14:40:25.661 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/keymatrix/0.1.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 14:40:25.910 INFO [stdout] b945f7c60071b814e23e09cfa81c1e3721eb4f74484ab9064c6957d502dff1ea
Dec 18 14:40:25.912 INFO running `"docker" "start" "-a" "b945f7c60071b814e23e09cfa81c1e3721eb4f74484ab9064c6957d502dff1ea"`
Dec 18 14:40:26.792 INFO [stderr]    Compiling rand_core v0.3.0
Dec 18 14:40:26.794 INFO [stderr]    Compiling cortex-m-rt v0.6.7
Dec 18 14:40:26.804 INFO [stderr]    Compiling atsamd21g18a v0.3.1
Dec 18 14:40:26.811 INFO [stderr]    Compiling cortex-m-rtfm v0.3.4
Dec 18 14:40:26.815 INFO [stderr]     Checking bitfield v0.13.1
Dec 18 14:40:26.815 INFO [stderr]     Checking rtfm-core v0.2.0
Dec 18 14:40:26.815 INFO [stderr]     Checking panic-abort v0.2.0
Dec 18 14:40:26.849 INFO [stderr]    Compiling libc v0.2.45
Dec 18 14:40:27.128 INFO [stderr]    Compiling mashup-impl v0.1.9
Dec 18 14:40:27.172 INFO [stderr] error[E0557]: feature has been removed
Dec 18 14:40:27.172 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 18 14:40:27.172 INFO [stderr]    |
Dec 18 14:40:27.172 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 18 14:40:27.172 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:27.172 INFO [stderr]    |
Dec 18 14:40:27.172 INFO [stderr] note: subsumed by `#[panic_handler]`
Dec 18 14:40:27.172 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 18 14:40:27.172 INFO [stderr]    |
Dec 18 14:40:27.172 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 18 14:40:27.172 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:27.172 INFO [stderr] 
Dec 18 14:40:27.256 INFO [stderr] error[E0658]: The attribute `panic_implementation` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Dec 18 14:40:27.256 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:28:3
Dec 18 14:40:27.256 INFO [stderr]    |
Dec 18 14:40:27.256 INFO [stderr] 28 | #[panic_implementation]
Dec 18 14:40:27.256 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:27.256 INFO [stderr]    |
Dec 18 14:40:27.256 INFO [stderr]    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 18 14:40:27.256 INFO [stderr] 
Dec 18 14:40:27.256 INFO [stderr] error: aborting due to 2 previous errors
Dec 18 14:40:27.256 INFO [stderr] 
Dec 18 14:40:27.256 INFO [stderr] Some errors occurred: E0557, E0658.
Dec 18 14:40:27.256 INFO [stderr] For more information about an error, try `rustc --explain E0557`.
Dec 18 14:40:27.296 INFO [stderr] error: Could not compile `panic-abort`.
Dec 18 14:40:27.296 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:40:28.867 INFO [stderr] error: build failed
Dec 18 14:40:29.203 INFO running `"docker" "inspect" "b945f7c60071b814e23e09cfa81c1e3721eb4f74484ab9064c6957d502dff1ea"`
Dec 18 14:40:29.293 INFO running `"docker" "rm" "-f" "b945f7c60071b814e23e09cfa81c1e3721eb4f74484ab9064c6957d502dff1ea"`
Dec 18 14:40:29.395 INFO [stdout] b945f7c60071b814e23e09cfa81c1e3721eb4f74484ab9064c6957d502dff1ea