Dec 18 14:40:25.338 INFO checking keymatrix-0.1.2 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 14:40:25.338 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-7/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 14:40:25.638 INFO [stdout] 14d47d4e9b773ffa30faf3ac9d2f49223342e363a50e4c80540b7db3498e5f3e
Dec 18 14:40:25.642 INFO running `"docker" "start" "-a" "14d47d4e9b773ffa30faf3ac9d2f49223342e363a50e4c80540b7db3498e5f3e"`
Dec 18 14:40:26.611 INFO [stderr]    Compiling rand_core v0.3.0
Dec 18 14:40:26.611 INFO [stderr]    Compiling cortex-m-rt v0.6.7
Dec 18 14:40:26.612 INFO [stderr]    Compiling atsamd21g18a v0.3.1
Dec 18 14:40:26.613 INFO [stderr]    Compiling cortex-m-rtfm v0.3.4
Dec 18 14:40:26.613 INFO [stderr]     Checking bitfield v0.13.1
Dec 18 14:40:26.613 INFO [stderr]     Checking rtfm-core v0.2.0
Dec 18 14:40:26.616 INFO [stderr]     Checking panic-abort v0.2.0
Dec 18 14:40:26.616 INFO [stderr]    Compiling mashup-impl v0.1.9
Dec 18 14:40:26.849 INFO [stderr] error[E0557]: feature has been removed
Dec 18 14:40:26.849 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 18 14:40:26.849 INFO [stderr]    |
Dec 18 14:40:26.849 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 18 14:40:26.849 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:26.849 INFO [stderr]    |
Dec 18 14:40:26.849 INFO [stderr] note: subsumed by `#[panic_handler]`
Dec 18 14:40:26.849 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:22:12
Dec 18 14:40:26.849 INFO [stderr]    |
Dec 18 14:40:26.849 INFO [stderr] 22 | #![feature(panic_implementation)]
Dec 18 14:40:26.849 INFO [stderr]    |            ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:26.849 INFO [stderr] 
Dec 18 14:40:26.884 INFO [stderr]     Checking samd21g18a v0.2.1
Dec 18 14:40:26.912 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 14:40:26.961 INFO [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/panic-abort-0.2.0/src/lib.rs:28:3
Dec 18 14:40:26.961 INFO [stderr]    |
Dec 18 14:40:26.961 INFO [stderr] 28 | #[panic_implementation]
Dec 18 14:40:26.961 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
Dec 18 14:40:26.961 INFO [stderr]    |
Dec 18 14:40:26.961 INFO [stderr]    = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 18 14:40:26.962 INFO [stderr] 
Dec 18 14:40:26.962 INFO [stderr] error: aborting due to 2 previous errors
Dec 18 14:40:26.962 INFO [stderr] 
Dec 18 14:40:26.962 INFO [stderr] Some errors occurred: E0557, E0658.
Dec 18 14:40:26.962 INFO [stderr] For more information about an error, try `rustc --explain E0557`.
Dec 18 14:40:26.962 INFO [stderr] error: Could not compile `panic-abort`.
Dec 18 14:40:26.962 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 18 14:40:35.205 INFO [stderr] error: build failed
Dec 18 14:40:36.248 INFO running `"docker" "inspect" "14d47d4e9b773ffa30faf3ac9d2f49223342e363a50e4c80540b7db3498e5f3e"`
Dec 18 14:40:36.400 INFO running `"docker" "rm" "-f" "14d47d4e9b773ffa30faf3ac9d2f49223342e363a50e4c80540b7db3498e5f3e"`
Dec 18 14:40:36.696 INFO [stdout] 14d47d4e9b773ffa30faf3ac9d2f49223342e363a50e4c80540b7db3498e5f3e